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File lvm.conf of Package lvm2

# This is an example configuration file for the LVM2 system.
# It contains the default settings that would be used if there was no
# /etc/lvm/lvm.conf file.
#
# Refer to 'man lvm.conf' for further information including the file layout.
#
# Refer to 'man lvm.conf' for information about how settings configured in
# this file are combined with built-in values and command line options to
# arrive at the final values used by LVM.
#
# Refer to 'man lvmconfig' for information about displaying the built-in
# and configured values used by LVM.
#
# If a default value is set in this file (not commented out), then a
# new version of LVM using this file will continue using that value,
# even if the new version of LVM changes the built-in default value.
#
# To put this file in a different directory and override /etc/lvm set
# the environment variable LVM_SYSTEM_DIR before running the tools.
#
# N.B. Take care that each setting only appears once if uncommenting
# example settings in this file.

# Configuration section config.
# How LVM configuration settings are handled.
config {

# Configuration option config/checks.
	# If enabled, any LVM configuration mismatch is reported.
	# This implies checking that the configuration key is understood by
	# LVM and that the value of the key is the proper type. If disabled,
	# any configuration mismatch is ignored and the default value is used
	# without any warning (a message about the configuration key not being
	# found is issued in verbose mode only).
	# This configuration option has an automatic default value.
	# checks = 1

# Configuration option config/abort_on_errors.
	# Abort the LVM process if a configuration mismatch is found.
	# This configuration option has an automatic default value.
	# abort_on_errors = 0

# Configuration option config/profile_dir.
	# Directory where LVM looks for configuration profiles.
	# This configuration option has an automatic default value.
	# profile_dir = "/etc/lvm/profile"
}

# Configuration section devices.
# How LVM uses block devices.
devices {

# Configuration option devices/dir.
	# Directory in which to create volume group device nodes.
	# Commands also accept this as a prefix on volume group names.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# dir = "/dev"

# Configuration option devices/scan.
	# Directories containing device nodes to use with LVM.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# scan = [ "/dev" ]

# Configuration option devices/obtain_device_list_from_udev.
	# Obtain the list of available devices from udev.
	# This avoids opening or using any inapplicable non-block devices or
	# subdirectories found in the udev directory. Any device node or
	# symlink not managed by udev in the udev directory is ignored. This
	# setting applies only to the udev-managed device directory; other
	# directories will be scanned fully. LVM needs to be compiled with
	# udev support for this setting to apply.
	# This configuration option has an automatic default value.
	# obtain_device_list_from_udev = 0
	obtain_device_list_from_udev = 1

# Configuration option devices/external_device_info_source.
	# Enable device information from udev.
	# If set to "udev", lvm will supplement its own native device information
	# with information from libudev. This can potentially improve the detection
	# of MD component devices and multipath component devices.
	# This configuration option has an automatic default value.
	# external_device_info_source = "none"
	external_device_info_source = "udev"

# Configuration option devices/hints.
	# Use a local file to remember which devices have PVs on them.
	# Some commands will use this as an optimization to reduce device
	# scanning, and will only scan the listed PVs. Removing the hint file
	# will cause lvm to generate a new one. Disable hints if PVs will
	# be copied onto devices using non-lvm commands, like dd.
	#
	# Accepted values:
	#   all
	#     Use all hints.
	#   none
	#     Use no hints.
	#
	# This configuration option has an automatic default value.
	# hints = "all"

# Configuration option devices/preferred_names.
	# Select which path name to display for a block device.
	# If multiple path names exist for a block device, and LVM needs to
	# display a name for the device, the path names are matched against
	# each item in this list of regular expressions. The first match is
	# used. Try to avoid using undescriptive /dev/dm-N names, if present.
	# If no preferred name matches, or if preferred_names are not defined,
	# the following built-in preferences are applied in order until one
	# produces a preferred name:
	# Prefer names with path prefixes in the order of:
	# /dev/mapper, /dev/disk, /dev/dm-*, /dev/block.
	# Prefer the name with the least number of slashes.
	# Prefer a name that is a symlink.
	# Prefer the path with least value in lexicographical order.
	#
	# Example
	# preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option devices/use_devicesfile.
	# Enable or disable the use of a devices file.
	# When enabled, lvm will only use devices that
	# are lised in the devices file. A devices file will
	# be used, regardless of this setting, when the --devicesfile
	# option is set to a specific file name.
	# This configuration option has an automatic default value.
	# use_devicesfile = 0

# Configuration option devices/devicesfile.
	# The name of the system devices file, listing devices that LVM should use.
	# This should not be used to select a non-system devices file.
	# The --devicesfile option is intended for alternative devices files.
	# This configuration option has an automatic default value.
	# devicesfile = "system.devices"

# Configuration option devices/search_for_devnames.
	# Look outside of the devices file for missing devname entries.
	# A devname entry is used for a device that does not have a stable
	# device id, e.g. wwid, so the unstable device name is used as
	# the device id. After reboot, or if the device is reattached,
	# the device name may change, in which case lvm will not find
	# the expected PV on the device listed in the devices file.
	# This setting controls whether lvm will search other devices,
	# outside the devices file, to look for the missing PV on a
	# renamed device. If "none", lvm will not look at other devices,
	# and the PV may appear to be missing. If "auto", lvm will look
	# at other devices, but only those that are likely to have the PV.
	# If "all", lvm will look at all devices on the system.
	# This configuration option has an automatic default value.
	# search_for_devnames = "auto"

# Configuration option devices/filter.
	# Limit the block devices that are used by LVM commands.
	# This is a list of regular expressions used to accept or reject block
	# device path names. Each regex is delimited by a vertical bar '|'
	# (or any character) and is preceded by 'a' to accept the path, or
	# by 'r' to reject the path. The first regex in the list to match the
	# path is used, producing the 'a' or 'r' result for the device.
	# When multiple path names exist for a block device, if any path name
	# matches an 'a' pattern before an 'r' pattern, then the device is
	# accepted. If all the path names match an 'r' pattern first, then the
	# device is rejected. Unmatching path names do not affect the accept
	# or reject decision. If no path names for a device match a pattern,
	# then the device is accepted. Be careful mixing 'a' and 'r' patterns,
	# as the combination might produce unexpected results (test changes.)
	# Run vgscan after changing the filter to regenerate the cache.
	#
	# Example
	# Accept every block device:
	# filter = [ "a|.*|" ]
	# Reject the cdrom drive:
	# filter = [ "r|/dev/cdrom|" ]
	# Work with just loopback devices, e.g. for testing:
	# filter = [ "a|loop|", "r|.*|" ]
	# Accept all loop devices and ide drives except hdc:
	# filter = [ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]
	# Use anchors to be very specific:
	# filter = [ "a|^/dev/hda8$|", "r|.*|" ]
	#
	# This configuration option has an automatic default value.
	# filter = [ "a|.*|" ]
	# Below filter was used in SUSE/openSUSE before lvm2-2.03. It conflicts
	# with lvm2-2.02.180+, so comment out in lvm2-2.03 release.
	# filter = [ "r|/dev/.*/by-path/.*|", "r|/dev/.*/by-id/.*|", "r|/dev/fd.*|", "r|/dev/cdrom|", "a/.*/" ]

# Configuration option devices/global_filter.
	# Limit the block devices that are used by LVM system components.
	# Because devices/filter may be overridden from the command line, it is
	# not suitable for system-wide device filtering, e.g. udev.
	# Use global_filter to hide devices from these LVM system components.
	# The syntax is the same as devices/filter. Devices rejected by
	# global_filter are not opened by LVM.
	# This configuration option has an automatic default value.
	# global_filter = [ "a|.*|" ]

# Configuration option devices/types.
	# List of additional acceptable block device types.
	# These are of device type names from /proc/devices, followed by the
	# maximum number of partitions.
	#
	# Example
	# types = [ "fd", 16 ]
	#
	# This configuration option is advanced.
	# This configuration option does not have a default value defined.

# Configuration option devices/sysfs_scan.
	# Restrict device scanning to block devices appearing in sysfs.
	# This is a quick way of filtering out block devices that are not
	# present on the system. sysfs must be part of the kernel and mounted.)
	# This configuration option has an automatic default value.
	# sysfs_scan = 1

# Configuration option devices/scan_lvs.
	# Scan LVM LVs for layered PVs, allowing LVs to be used as PVs.
	# When 1, LVM will detect PVs layered on LVs, and caution must be
	# taken to avoid a host accessing a layered VG that may not belong
	# to it, e.g. from a guest image. This generally requires excluding
	# the LVs with device filters. Also, when this setting is enabled,
	# every LVM command will scan every active LV on the system (unless
	# filtered), which can cause performance problems on systems with
	# many active LVs. When this setting is 0, LVM will not detect or
	# use PVs that exist on LVs, and will not allow a PV to be created on
	# an LV. The LVs are ignored using a built in device filter that
	# identifies and excludes LVs.
	# This configuration option has an automatic default value.
	# scan_lvs = 0

# Configuration option devices/multipath_component_detection.
	# Ignore devices that are components of DM multipath devices.
	# This configuration option has an automatic default value.
	# multipath_component_detection = 1

# Configuration option devices/multipath_wwids_file.
	# The path to the multipath wwids file used for multipath component detection.
	# Set this to an empty string to disable the use of the multipath wwids file.
	# This configuration option has an automatic default value.
	# multipath_wwids_file = "/etc/multipath/wwids"

# Configuration option devices/md_component_detection.
	# Enable detection and exclusion of MD component devices.
	# An MD component device is a block device that MD uses as part
	# of a software RAID virtual device. When an LVM PV is created
	# on an MD device, LVM must only use the top level MD device as
	# the PV, and should ignore the underlying component devices.
	# In cases where the MD superblock is located at the end of the
	# component devices, it is more difficult for LVM to consistently
	# identify an MD component, see the md_component_checks setting.
	# This configuration option has an automatic default value.
	# md_component_detection = 1

# Configuration option devices/md_component_checks.
	# The checks LVM should use to detect MD component devices.
	# MD component devices are block devices used by MD software RAID.
	#
	# Accepted values:
	#   auto
	#     LVM will skip scanning the end of devices when it has other
	#     indications that the device is not an MD component.
	#   start
	#     LVM will only scan the start of devices for MD superblocks.
	#     This does not incur extra I/O by LVM.
	#   full
	#     LVM will scan the start and end of devices for MD superblocks.
	#     This requires an extra read at the end of devices.
	#
	# This configuration option has an automatic default value.
	# md_component_checks = "auto"

# Configuration option devices/fw_raid_component_detection.
	# Ignore devices that are components of firmware RAID devices.
	# LVM must use an external_device_info_source other than none for this
	# detection to execute.
	# This configuration option has an automatic default value.
	# fw_raid_component_detection = 0

# Configuration option devices/md_chunk_alignment.
	# Align the start of a PV data area with md device's stripe-width.
	# This applies if a PV is placed directly on an md device.
	# default_data_alignment will be overridden if it is not aligned
	# with the value detected for this setting.
	# This setting is overridden by data_alignment_detection,
	# data_alignment, and the --dataalignment option.
	# This configuration option has an automatic default value.
	# md_chunk_alignment = 1

# Configuration option devices/default_data_alignment.
	# Align the start of a PV data area with this number of MiB.
	# Set to 1 for 1MiB, 2 for 2MiB, etc. Set to 0 to disable.
	# This setting is overridden by data_alignment and the --dataalignment
	# option.
	# This configuration option has an automatic default value.
	# default_data_alignment = 1

# Configuration option devices/data_alignment_detection.
	# Align the start of a PV data area with sysfs io properties.
	# The start of a PV data area will be a multiple of minimum_io_size or
	# optimal_io_size exposed in sysfs. minimum_io_size is the smallest
	# request the device can perform without incurring a read-modify-write
	# penalty, e.g. MD chunk size. optimal_io_size is the device's
	# preferred unit of receiving I/O, e.g. MD stripe width.
	# minimum_io_size is used if optimal_io_size is undefined (0).
	# If md_chunk_alignment is enabled, that detects the optimal_io_size.
	# default_data_alignment and md_chunk_alignment will be overridden
	# if they are not aligned with the value detected for this setting.
	# This setting is overridden by data_alignment and the --dataalignment
	# option.
	# This configuration option has an automatic default value.
	# data_alignment_detection = 1

# Configuration option devices/data_alignment.
	# Align the start of a PV data area with this number of KiB.
	# When non-zero, this setting overrides default_data_alignment.
	# Set to 0 to disable, in which case default_data_alignment
	# is used to align the first PE in units of MiB.
	# This setting is overridden by the --dataalignment option.
	# This configuration option has an automatic default value.
	# data_alignment = 0

# Configuration option devices/data_alignment_offset_detection.
	# Shift the start of an aligned PV data area based on sysfs information.
	# After a PV data area is aligned, it will be shifted by the
	# alignment_offset exposed in sysfs. This offset is often 0, but may
	# be non-zero. Certain 4KiB sector drives that compensate for windows
	# partitioning will have an alignment_offset of 3584 bytes (sector 7
	# is the lowest aligned logical block, the 4KiB sectors start at
	# LBA -1, and consequently sector 63 is aligned on a 4KiB boundary).
	# This setting is overridden by the --dataalignmentoffset option.
	# This configuration option has an automatic default value.
	# data_alignment_offset_detection = 1

# Configuration option devices/ignore_suspended_devices.
	# Ignore DM devices that have I/O suspended while scanning devices.
	# Otherwise, LVM waits for a suspended device to become accessible.
	# This should only be needed in recovery situations.
	# This configuration option has an automatic default value.
	# ignore_suspended_devices = 0

# Configuration option devices/ignore_lvm_mirrors.
	# Do not scan 'mirror' LVs to avoid possible deadlocks.
	# This avoids possible deadlocks when using the 'mirror' segment type.
	# This setting determines whether LVs using the 'mirror' segment type
	# are scanned for LVM labels. This affects the ability of mirrors to
	# be used as physical volumes. If this setting is enabled, it is
	# impossible to create VGs on top of mirror LVs, i.e. to stack VGs on
	# mirror LVs. If this setting is disabled, allowing mirror LVs to be
	# scanned, it may cause LVM processes and I/O to the mirror to become
	# blocked. This is due to the way that the mirror segment type handles
	# failures. In order for the hang to occur, an LVM command must be run
	# just after a failure and before the automatic LVM repair process
	# takes place, or there must be failures in multiple mirrors in the
	# same VG at the same time with write failures occurring moments before
	# a scan of the mirror's labels. The 'mirror' scanning problems do not
	# apply to LVM RAID types like 'raid1' which handle failures in a
	# different way, making them a better choice for VG stacking.
	# This configuration option has an automatic default value.
	# ignore_lvm_mirrors = 1

# Configuration option devices/require_restorefile_with_uuid.
	# Allow use of pvcreate --uuid without requiring --restorefile.
	# This configuration option has an automatic default value.
	# require_restorefile_with_uuid = 1

# Configuration option devices/pv_min_size.
	# Minimum size in KiB of block devices which can be used as PVs.
	# In a clustered environment all nodes must use the same value.
	# Any value smaller than 512KiB is ignored. The previous built-in
	# value was 512.
	# This configuration option has an automatic default value.
	# pv_min_size = 2048

# Configuration option devices/issue_discards.
	# Issue discards to PVs that are no longer used by an LV.
	# Discards are sent to an LV's underlying physical volumes when the LV
	# is no longer using the physical volumes' space, e.g. lvremove,
	# lvreduce. Discards inform the storage that a region is no longer
	# used. Storage that supports discards advertise the protocol-specific
	# way discards should be issued by the kernel (TRIM, UNMAP, or
	# WRITE SAME with UNMAP bit set). Not all storage will support or
	# benefit from discards, but SSDs and thinly provisioned LUNs
	# generally do. If enabled, discards will only be issued if both the
	# storage and kernel provide support.
	# This configuration option has an automatic default value.
	# issue_discards = 0
	issue_discards = 1

# Configuration option devices/allow_changes_with_duplicate_pvs.
	# Allow VG modification while a PV appears on multiple devices.
	# When a PV appears on multiple devices, LVM attempts to choose the
	# best device to use for the PV. If the devices represent the same
	# underlying storage, the choice has minimal consequence. If the
	# devices represent different underlying storage, the wrong choice
	# can result in data loss if the VG is modified. Disabling this
	# setting is the safest option because it prevents modifying a VG
	# or activating LVs in it while a PV appears on multiple devices.
	# Enabling this setting allows the VG to be used as usual even with
	# uncertain devices.
	# This configuration option has an automatic default value.
	# allow_changes_with_duplicate_pvs = 0

# Configuration option devices/allow_mixed_block_sizes.
	# Allow PVs in the same VG with different logical block sizes.
	# When allowed, the user is responsible to ensure that an LV is
	# using PVs with matching block sizes when necessary.
	# This configuration option has an automatic default value.
	# allow_mixed_block_sizes = 0
}

# Configuration section allocation.
# How LVM selects space and applies properties to LVs.
allocation {

# Configuration option allocation/cling_tag_list.
	# Advise LVM which PVs to use when searching for new space.
	# When searching for free space to extend an LV, the 'cling' allocation
	# policy will choose space on the same PVs as the last segment of the
	# existing LV. If there is insufficient space and a list of tags is
	# defined here, it will check whether any of them are attached to the
	# PVs concerned and then seek to match those PV tags between existing
	# extents and new extents.
	#
	# Example
	# Use the special tag "@*" as a wildcard to match any PV tag:
	# cling_tag_list = [ "@*" ]
	# LVs are mirrored between two sites within a single VG, and
	# PVs are tagged with either @site1 or @site2 to indicate where
	# they are situated:
	# cling_tag_list = [ "@site1", "@site2" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option allocation/maximise_cling.
	# Use a previous allocation algorithm.
	# Changes made in version 2.02.85 extended the reach of the 'cling'
	# policies to detect more situations where data can be grouped onto
	# the same disks. This setting can be used to disable the changes
	# and revert to the previous algorithm.
	# This configuration option has an automatic default value.
	# maximise_cling = 1

# Configuration option allocation/use_blkid_wiping.
	# Use blkid to detect and erase existing signatures on new PVs and LVs.
	# The blkid library can detect more signatures than the native LVM
	# detection code, but may take longer. LVM needs to be compiled with
	# blkid wiping support for this setting to apply. LVM native detection
	# code is currently able to recognize: MD device signatures,
	# swap signature, and LUKS signatures. To see the list of signatures
	# recognized by blkid, check the output of the 'blkid -k' command.
	# This configuration option has an automatic default value.
	# use_blkid_wiping = 1

# Configuration option allocation/wipe_signatures_when_zeroing_new_lvs.
	# Look for and erase any signatures while zeroing a new LV.
	# The --wipesignatures option overrides this setting.
	# Zeroing is controlled by the -Z/--zero option, and if not specified,
	# zeroing is used by default if possible. Zeroing simply overwrites the
	# first 4KiB of a new LV with zeroes and does no signature detection or
	# wiping. Signature wiping goes beyond zeroing and detects exact types
	# and positions of signatures within the whole LV. It provides a
	# cleaner LV after creation as all known signatures are wiped. The LV
	# is not claimed incorrectly by other tools because of old signatures
	# from previous use. The number of signatures that LVM can detect
	# depends on the detection code that is selected (see
	# use_blkid_wiping.) Wiping each detected signature must be confirmed.
	# When this setting is disabled, signatures on new LVs are not detected
	# or erased unless the --wipesignatures option is used directly.
	# This configuration option has an automatic default value.
	# wipe_signatures_when_zeroing_new_lvs = 1

# Configuration option allocation/mirror_logs_require_separate_pvs.
	# Mirror logs and images will always use different PVs.
	# The default setting changed in version 2.02.85.
	# This configuration option has an automatic default value.
	# mirror_logs_require_separate_pvs = 0

# Configuration option allocation/raid_stripe_all_devices.
	# Stripe across all PVs when RAID stripes are not specified.
	# If enabled, all PVs in the VG or on the command line are used for
	# raid0/4/5/6/10 when the command does not specify the number of
	# stripes to use.
	# This was the default behaviour until release 2.02.162.
	# This configuration option has an automatic default value.
	# raid_stripe_all_devices = 0

# Configuration option allocation/cache_pool_metadata_require_separate_pvs.
	# Cache pool metadata and data will always use different PVs.
	# This configuration option has an automatic default value.
	# cache_pool_metadata_require_separate_pvs = 0

# Configuration option allocation/cache_metadata_format.
	# Sets default metadata format for new cache.
	#
	# Accepted values:
	#   0  Automatically detected best available format
	#   1  Original format
	#   2  Improved 2nd. generation format
	#
	# This configuration option has an automatic default value.
	# cache_metadata_format = 0

# Configuration option allocation/cache_mode.
	# The default cache mode used for new cache.
	#
	# Accepted values:
	#   writethrough
	#     Data blocks are immediately written from the cache to disk.
	#   writeback
	#     Data blocks are written from the cache back to disk after some
	#     delay to improve performance.
	#
	# This setting replaces allocation/cache_pool_cachemode.
	# This configuration option has an automatic default value.
	# cache_mode = "writethrough"

# Configuration option allocation/cache_policy.
	# The default cache policy used for new cache volume.
	# Since kernel 4.2 the default policy is smq (Stochastic multiqueue),
	# otherwise the older mq (Multiqueue) policy is selected.
	# This configuration option does not have a default value defined.

# Configuration section allocation/cache_settings.
	# Settings for the cache policy.
	# See documentation for individual cache policies for more info.
	# This configuration section has an automatic default value.
	# cache_settings {
	# }

# Configuration option allocation/cache_pool_chunk_size.
	# The minimal chunk size in KiB for cache pool volumes.
	# Using a chunk_size that is too large can result in wasteful use of
	# the cache, where small reads and writes can cause large sections of
	# an LV to be mapped into the cache. However, choosing a chunk_size
	# that is too small can result in more overhead trying to manage the
	# numerous chunks that become mapped into the cache. The former is
	# more of a problem than the latter in most cases, so the default is
	# on the smaller end of the spectrum. Supported values range from
	# 32KiB to 1GiB in multiples of 32.
	# This configuration option does not have a default value defined.

# Configuration option allocation/cache_pool_max_chunks.
	# The maximum number of chunks in a cache pool.
	# For cache target v1.9 the recommended maximumm is 1000000 chunks.
	# Using cache pool with more chunks may degrade cache performance.
	# This configuration option does not have a default value defined.

# Configuration option allocation/thin_pool_metadata_require_separate_pvs.
	# Thin pool metadata and data will always use different PVs.
	# This configuration option has an automatic default value.
	# thin_pool_metadata_require_separate_pvs = 0

# Configuration option allocation/thin_pool_crop_metadata.
	# Older version of lvm2 cropped pool's metadata size to 15.81 GiB.
	# This is slightly less then the actual maximum 15.88 GiB.
	# For compatibility with older version and use of cropped size set to 1.
	# This configuration option has an automatic default value.
	# thin_pool_crop_metadata = 0

# Configuration option allocation/thin_pool_zero.
	# Thin pool data chunks are zeroed before they are first used.
	# Zeroing with a larger thin pool chunk size reduces performance.
	# This configuration option has an automatic default value.
	# thin_pool_zero = 1

# Configuration option allocation/thin_pool_discards.
	# The discards behaviour of thin pool volumes.
	#
	# Accepted values:
	#   ignore
	#   nopassdown
	#   passdown
	#
	# This configuration option has an automatic default value.
	# thin_pool_discards = "passdown"

# Configuration option allocation/thin_pool_chunk_size_policy.
	# The chunk size calculation policy for thin pool volumes.
	#
	# Accepted values:
	#   generic
	#     If thin_pool_chunk_size is defined, use it. Otherwise, calculate
	#     the chunk size based on estimation and device hints exposed in
	#     sysfs - the minimum_io_size. The chunk size is always at least
	#     64KiB.
	#   performance
	#     If thin_pool_chunk_size is defined, use it. Otherwise, calculate
	#     the chunk size for performance based on device hints exposed in
	#     sysfs - the optimal_io_size. The chunk size is always at least
	#     512KiB.
	#
	# This configuration option has an automatic default value.
	# thin_pool_chunk_size_policy = "generic"

# Configuration option allocation/zero_metadata.
	# Zero whole metadata area before use with thin or cache pool.
	# This configuration option has an automatic default value.
	# zero_metadata = 1

# Configuration option allocation/thin_pool_chunk_size.
	# The minimal chunk size in KiB for thin pool volumes.
	# Larger chunk sizes may improve performance for plain thin volumes,
	# however using them for snapshot volumes is less efficient, as it
	# consumes more space and takes extra time for copying. When unset,
	# lvm tries to estimate chunk size starting from 64KiB. Supported
	# values are in the range 64KiB to 1GiB.
	# This configuration option does not have a default value defined.

# Configuration option allocation/physical_extent_size.
	# Default physical extent size in KiB to use for new VGs.
	# This configuration option has an automatic default value.
	# physical_extent_size = 4096

# Configuration option allocation/vdo_use_compression.
	# Enables or disables compression when creating a VDO volume.
	# Compression may be disabled if necessary to maximize performance
	# or to speed processing of data that is unlikely to compress.
	# This configuration option has an automatic default value.
	# vdo_use_compression = 1

# Configuration option allocation/vdo_use_deduplication.
	# Enables or disables deduplication when creating a VDO volume.
	# Deduplication may be disabled in instances where data is not expected
	# to have good deduplication rates but compression is still desired.
	# This configuration option has an automatic default value.
	# vdo_use_deduplication = 1

# Configuration option allocation/vdo_use_metadata_hints.
	# Enables or disables whether VDO volume should tag its latency-critical
	# writes with the REQ_SYNC flag. Some device mapper targets such as dm-raid5
	# process writes with this flag at a higher priority.
	# This configuration option has an automatic default value.
	# vdo_use_metadata_hints = 1

# Configuration option allocation/vdo_minimum_io_size.
	# The minimum IO size for VDO volume to accept, in bytes.
	# Valid values are 512 or 4096. The recommended value is 4096.
	# This configuration option has an automatic default value.
	# vdo_minimum_io_size = 4096

# Configuration option allocation/vdo_block_map_cache_size_mb.
	# Specifies the amount of memory in MiB allocated for caching block map
	# pages for VDO volume. The value must be a multiple of 4096 and must be
	# at least 128MiB and less than 16TiB. The cache must be at least 16MiB
	# per logical thread. Note that there is a memory overhead of 15%.
	# This configuration option has an automatic default value.
	# vdo_block_map_cache_size_mb = 128

# Configuration option allocation/vdo_block_map_period.
	# The speed with which the block map cache writes out modified block map pages.
	# A smaller era length is likely to reduce the amount time spent rebuilding,
	# at the cost of increased block map writes during normal operation.
	# The maximum and recommended value is 16380; the minimum value is 1.
	# This configuration option has an automatic default value.
	# vdo_block_map_period = 16380

# Configuration option allocation/vdo_check_point_frequency.
	# The default check point frequency for VDO volume.
	# This configuration option has an automatic default value.
	# vdo_check_point_frequency = 0

# Configuration option allocation/vdo_use_sparse_index.
	# Enables sparse indexing for VDO volume.
	# This configuration option has an automatic default value.
	# vdo_use_sparse_index = 0

# Configuration option allocation/vdo_index_memory_size_mb.
	# Specifies the amount of index memory in MiB for VDO volume.
	# The value must be at least 256MiB and at most 1TiB.
	# This configuration option has an automatic default value.
	# vdo_index_memory_size_mb = 256

# Configuration option allocation/vdo_slab_size_mb.
	# Specifies the size in MiB of the increment by which a VDO is grown.
	# Using a smaller size constrains the total maximum physical size
	# that can be accommodated. Must be a power of two between 128MiB and 32GiB.
	# This configuration option has an automatic default value.
	# vdo_slab_size_mb = 2048

# Configuration option allocation/vdo_ack_threads.
	# Specifies the number of threads to use for acknowledging
	# completion of requested VDO I/O operations.
	# The value must be at in range [0..100].
	# This configuration option has an automatic default value.
	# vdo_ack_threads = 1

# Configuration option allocation/vdo_bio_threads.
	# Specifies the number of threads to use for submitting I/O
	# operations to the storage device of VDO volume.
	# The value must be in range [1..100].
	# Each additional thread after the first will use an additional 18MiB of RAM,
	# plus 1.12 MiB of RAM per megabyte of configured read cache size.
	# This configuration option has an automatic default value.
	# vdo_bio_threads = 4

# Configuration option allocation/vdo_bio_rotation.
	# Specifies the number of I/O operations to enqueue for each bio-submission
	# thread before directing work to the next. The value must be in range [1..1024].
	# This configuration option has an automatic default value.
	# vdo_bio_rotation = 64

# Configuration option allocation/vdo_cpu_threads.
	# Specifies the number of threads to use for CPU-intensive work such as
	# hashing or compression for VDO volume. The value must be in range [1..100].
	# This configuration option has an automatic default value.
	# vdo_cpu_threads = 2

# Configuration option allocation/vdo_hash_zone_threads.
	# Specifies the number of threads across which to subdivide parts of the VDO
	# processing based on the hash value computed from the block data.
	# The value must be at in range [0..100].
	# vdo_hash_zone_threads, vdo_logical_threads and vdo_physical_threads must be
	# either all zero or all non-zero.
	# This configuration option has an automatic default value.
	# vdo_hash_zone_threads = 1

# Configuration option allocation/vdo_logical_threads.
	# Specifies the number of threads across which to subdivide parts of the VDO
	# processing based on the hash value computed from the block data.
	# A logical thread count of 9 or more will require explicitly specifying
	# a sufficiently large block map cache size, as well.
	# The value must be in range [0..60].
	# vdo_hash_zone_threads, vdo_logical_threads and vdo_physical_threads must be
	# either all zero or all non-zero.
	# This configuration option has an automatic default value.
	# vdo_logical_threads = 1

# Configuration option allocation/vdo_physical_threads.
	# Specifies the number of threads across which to subdivide parts of the VDO
	# processing based on physical block addresses.
	# Each additional thread after the first will use an additional 10MiB of RAM.
	# The value must be in range [0..16].
	# vdo_hash_zone_threads, vdo_logical_threads and vdo_physical_threads must be
	# either all zero or all non-zero.
	# This configuration option has an automatic default value.
	# vdo_physical_threads = 1

# Configuration option allocation/vdo_write_policy.
	# Specifies the write policy:
	# auto  - VDO will check the storage device and determine whether it supports flushes.
	#         If it does, VDO will run in async mode, otherwise it will run in sync mode.
	# sync  - Writes are acknowledged only after data is stably written.
	#         This policy is not supported if the underlying storage is not also synchronous.
	# async - Writes are acknowledged after data has been cached for writing to stable storage.
	#         Data which has not been flushed is not guaranteed to persist in this mode.
	# async-unsafe - Writes are handled like 'async' but there is no guarantee of the atomicity async provides.
	#         This mode should only be used for better performance when atomicity is not required.
	# This configuration option has an automatic default value.
	# vdo_write_policy = "auto"

# Configuration option allocation/vdo_max_discard.
	# Specified the maximum size of discard bio accepted, in 4096 byte blocks.
	# I/O requests to a VDO volume are normally split into 4096-byte blocks,
	# and processed up to 2048 at a time. However, discard requests to a VDO volume
	# can be automatically split to a larger size, up to <max discard> 4096-byte blocks
	# in a single bio, and are limited to 1500 at a time.
	# Increasing this value may provide better overall performance, at the cost of
	# increased latency for the individual discard requests.
	# The default and minimum is 1. The maximum is UINT_MAX / 4096.
	# This configuration option has an automatic default value.
	# vdo_max_discard = 1

# Configuration option allocation/vdo_pool_header_size.
	# Specified the emptry header size in KiB at the front and end of vdo pool device.
	# This configuration option has an automatic default value.
	# vdo_pool_header_size = 512
}

# Configuration section log.
# How LVM log information is reported.
log {

# Configuration option log/report_command_log.
	# Enable or disable LVM log reporting.
	# If enabled, LVM will collect a log of operations, messages,
	# per-object return codes with object identification and associated
	# error numbers (errnos) during LVM command processing. Then the
	# log is either reported solely or in addition to any existing
	# reports, depending on LVM command used. If it is a reporting command
	# (e.g. pvs, vgs, lvs, lvm fullreport), then the log is reported in
	# addition to any existing reports. Otherwise, there's only log report
	# on output. For all applicable LVM commands, you can request that
	# the output has only log report by using --logonly command line
	# option. Use log/command_log_cols and log/command_log_sort settings
	# to define fields to display and sort fields for the log report.
	# You can also use log/command_log_selection to define selection
	# criteria used each time the log is reported.
	# This configuration option has an automatic default value.
	# report_command_log = 0

# Configuration option log/command_log_sort.
	# List of columns to sort by when reporting command log.
	# See <lvm command> --logonly --configreport log -o help
	# for the list of possible fields.
	# This configuration option has an automatic default value.
	# command_log_sort = "log_seq_num"

# Configuration option log/command_log_cols.
	# List of columns to report when reporting command log.
	# See <lvm command> --logonly --configreport log -o help
	# for the list of possible fields.
	# This configuration option has an automatic default value.
	# command_log_cols = "log_seq_num,log_type,log_context,log_object_type,log_object_name,log_object_id,log_object_group,log_object_group_id,log_message,log_errno,log_ret_code"

# Configuration option log/command_log_selection.
	# Selection criteria used when reporting command log.
	# You can define selection criteria that are applied each
	# time log is reported. This way, it is possible to control the
	# amount of log that is displayed on output and you can select
	# only parts of the log that are important for you. To define
	# selection criteria, use fields from log report. See also
	# <lvm command> --logonly --configreport log -S help for the
	# list of possible fields and selection operators. You can also
	# define selection criteria for log report on command line directly
	# using <lvm command> --configreport log -S <selection criteria>
	# which has precedence over log/command_log_selection setting.
	# For more information about selection criteria in general, see
	# lvm(8) man page.
	# This configuration option has an automatic default value.
	# command_log_selection = "!(log_type=status && message=success)"

# Configuration option log/verbose.
	# Controls the messages sent to stdout or stderr.
	# This configuration option has an automatic default value.
	# verbose = 0

# Configuration option log/silent.
	# Suppress all non-essential messages from stdout.
	# This has the same effect as -qq. When enabled, the following commands
	# still produce output: dumpconfig, lvdisplay, lvmdiskscan, lvs, pvck,
	# pvdisplay, pvs, version, vgcfgrestore -l, vgdisplay, vgs.
	# Non-essential messages are shifted from log level 4 to log level 5
	# for syslog and lvm2_log_fn purposes.
	# Any 'yes' or 'no' questions not overridden by other arguments are
	# suppressed and default to 'no'.
	# This configuration option has an automatic default value.
	# silent = 0

# Configuration option log/syslog.
	# Send log messages through syslog.
	# This configuration option has an automatic default value.
	# syslog = 0
	syslog = 1

# Configuration option log/file.
	# Write error and debug log messages to a file specified here.
	# This configuration option does not have a default value defined.
	# file = "/var/log/lvm2.log"

# Configuration option log/journal.
	# Record lvm information in the systemd journal.
	# command: record commands that are run.
	# output: record default output from commands.
	# debug: record debug messages from commands.
	# This configuration option has an automatic default value.
	# journal = [ ]

# Configuration option log/overwrite.
	# Overwrite the log file each time the program is run.
	# This configuration option has an automatic default value.
	# overwrite = 0

# Configuration option log/level.
	# The level of log messages that are sent to the log file or syslog.
	# There are 6 syslog-like log levels currently in use: 2 to 7 inclusive.
	# 7 is the most verbose (LOG_DEBUG).
	# This configuration option has an automatic default value.
	# level = 0

# Configuration option log/indent.
	# Indent messages according to their severity.
	# This configuration option has an automatic default value.
	# indent = 0
	indent = 1

# Configuration option log/command_names.
	# Display the command name on each line of output.
	# This configuration option has an automatic default value.
	# command_names = 0

# Configuration option log/prefix.
	# A prefix to use before the log message text.
	# (After the command name, if selected).
	# Two spaces allows you to see/grep the severity of each message.
	# To make the messages look similar to the original LVM tools use:
	# indent = 0, command_names = 1, prefix = " -- "
	# This configuration option has an automatic default value.
	# prefix = "  "

# Configuration option log/activation.
	# Log messages during activation.
	# Don't use this in low memory situations (can deadlock).
	# This configuration option has an automatic default value.
	# activation = 0

# Configuration option log/debug_classes.
	# Select log messages by class.
	# Some debugging messages are assigned to a class and only appear in
	# debug output if the class is listed here. Classes currently
	# available: memory, devices, io, activation, allocation,
	# metadata, cache, locking, lvmpolld. Use "all" to see everything.
	# This configuration option has an automatic default value.
	# debug_classes = [ "memory", "devices", "io", "activation", "allocation", "metadata", "cache", "locking", "lvmpolld", "dbus" ]

# Configuration option log/debug_file_fields.
	# The fields included in debug output written to log file.
	# Use "all" to include everything (the default).
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# debug_file_fields = [ "time", "command", "fileline", "message" ]

# Configuration option log/debug_output_fields.
	# The fields included in debug output written to stderr.
	# Use "all" to include everything (the default).
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# debug_output_fields = [ "time", "command", "fileline", "message" ]
}

# Configuration section backup.
# How LVM metadata is backed up and archived.
# In LVM, a 'backup' is a copy of the metadata for the current system,
# and an 'archive' contains old metadata configurations. They are
# stored in a human readable text format.
backup {

# Configuration option backup/backup.
	# Maintain a backup of the current metadata configuration.
	# Think very hard before turning this off!
	# This configuration option has an automatic default value.
	# backup = 1

# Configuration option backup/backup_dir.
	# Location of the metadata backup files.
	# Remember to back up this directory regularly!
	# This configuration option has an automatic default value.
	# backup_dir = "/etc/lvm/backup"

# Configuration option backup/archive.
	# Maintain an archive of old metadata configurations.
	# Think very hard before turning this off.
	# This configuration option has an automatic default value.
	# archive = 1

# Configuration option backup/archive_dir.
	# Location of the metdata archive files.
	# Remember to back up this directory regularly!
	# This configuration option has an automatic default value.
	# archive_dir = "/etc/lvm/archive"

# Configuration option backup/retain_min.
	# Minimum number of archives to keep.
	# This configuration option has an automatic default value.
	# retain_min = 10

# Configuration option backup/retain_days.
	# Minimum number of days to keep archive files.
	# This configuration option has an automatic default value.
	# retain_days = 30
}

# Configuration section shell.
# Settings for running LVM in shell (readline) mode.
shell {

# Configuration option shell/history_size.
	# Number of lines of history to store in ~/.lvm_history.
	# This configuration option has an automatic default value.
	# history_size = 100
}

# Configuration section global.
# Miscellaneous global LVM settings.
global {

# Configuration option global/umask.
	# The file creation mask for any files and directories created.
	# Interpreted as octal if the first digit is zero.
	# This configuration option has an automatic default value.
	# umask = 077

# Configuration option global/test.
	# No on-disk metadata changes will be made in test mode.
	# Equivalent to having the -t option on every command.
	# This configuration option has an automatic default value.
	# test = 0

# Configuration option global/units.
	# Default value for --units argument.
	# This configuration option has an automatic default value.
	# units = "r"
	units = "h"

# Configuration option global/si_unit_consistency.
	# Distinguish between powers of 1024 and 1000 bytes.
	# The LVM commands distinguish between powers of 1024 bytes,
	# e.g. KiB, MiB, GiB, and powers of 1000 bytes, e.g. KB, MB, GB.
	# If scripts depend on the old behaviour, disable this setting
	# temporarily until they are updated.
	# This configuration option has an automatic default value.
	# si_unit_consistency = 1

# Configuration option global/suffix.
	# Display unit suffix for sizes.
	# This setting has no effect if the units are in human-readable form
	# (global/units = "h") in which case the suffix is always displayed.
	# This configuration option has an automatic default value.
	# suffix = 1

# Configuration option global/activation.
	# Enable/disable communication with the kernel device-mapper.
	# Disable to use the tools to manipulate LVM metadata without
	# activating any logical volumes. If the device-mapper driver
	# is not present in the kernel, disabling this should suppress
	# the error messages.
	# This configuration option has an automatic default value.
	# activation = 1

# Configuration option global/proc.
	# Location of proc filesystem.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# proc = "/proc"

# Configuration option global/etc.
	# Location of /etc system configuration directory.
	# This configuration option has an automatic default value.
	# etc = "/etc"

# Configuration option global/wait_for_locks.
	# When disabled, fail if a lock request would block.
	# This configuration option has an automatic default value.
	# wait_for_locks = 1

# Configuration option global/locking_dir.
	# Directory to use for LVM command file locks.
	# Local non-LV directory that holds file-based locks while commands are
	# in progress. A directory like /tmp that may get wiped on reboot is OK.
	# This configuration option has an automatic default value.
	# locking_dir = "/run/lock/lvm"

# Configuration option global/prioritise_write_locks.
	# Allow quicker VG write access during high volume read access.
	# When there are competing read-only and read-write access requests for
	# a volume group's metadata, instead of always granting the read-only
	# requests immediately, delay them to allow the read-write requests to
	# be serviced. Without this setting, write access may be stalled by a
	# high volume of read-only requests. This option only affects file locks.
	# This configuration option has an automatic default value.
	# prioritise_write_locks = 1

# Configuration option global/library_dir.
	# Search this directory first for shared libraries.
	# This configuration option does not have a default value defined.

# Configuration option global/abort_on_internal_errors.
	# Abort a command that encounters an internal error.
	# Treat any internal errors as fatal errors, aborting the process that
	# encountered the internal error. Please only enable for debugging.
	# This configuration option has an automatic default value.
	# abort_on_internal_errors = 0

# Configuration option global/metadata_read_only.
	# No operations that change on-disk metadata are permitted.
	# Additionally, read-only commands that encounter metadata in need of
	# repair will still be allowed to proceed exactly as if the repair had
	# been performed (except for the unchanged vg_seqno). Inappropriate
	# use could mess up your system, so seek advice first!
	# This configuration option has an automatic default value.
	# metadata_read_only = 0

# Configuration option global/mirror_segtype_default.
	# The segment type used by the short mirroring option -m.
	# The --type mirror|raid1 option overrides this setting.
	#
	# Accepted values:
	#   mirror
	#     The original RAID1 implementation from LVM/DM. It is
	#     characterized by a flexible log solution (core, disk, mirrored),
	#     and by the necessity to block I/O while handling a failure.
	#     There is an inherent race in the dmeventd failure handling logic
	#     with snapshots of devices using this type of RAID1 that in the
	#     worst case could cause a deadlock. (Also see
	#     devices/ignore_lvm_mirrors.)
	#   raid1
	#     This is a newer RAID1 implementation using the MD RAID1
	#     personality through device-mapper. It is characterized by a
	#     lack of log options. (A log is always allocated for every
	#     device and they are placed on the same device as the image,
	#     so no separate devices are required.) This mirror
	#     implementation does not require I/O to be blocked while
	#     handling a failure. This mirror implementation is not
	#     cluster-aware and cannot be used in a shared (active/active)
	#     fashion in a cluster.
	#
	# This configuration option has an automatic default value.
	# mirror_segtype_default = "raid1"

# Configuration option global/support_mirrored_mirror_log.
	# Enable mirrored 'mirror' log type for testing.
	#
	# This type is deprecated to create or convert to but can
	# be enabled to test that activation of existing mirrored
	# logs and conversion to disk/core works.
	#
	# Not supported for regular operation!
	# This configuration option has an automatic default value.
	# support_mirrored_mirror_log = 0

# Configuration option global/raid10_segtype_default.
	# The segment type used by the -i -m combination.
	# The --type raid10|mirror option overrides this setting.
	# The --stripes/-i and --mirrors/-m options can both be specified
	# during the creation of a logical volume to use both striping and
	# mirroring for the LV. There are two different implementations.
	#
	# Accepted values:
	#   raid10
	#     LVM uses MD's RAID10 personality through DM. This is the
	#     preferred option.
	#   mirror
	#     LVM layers the 'mirror' and 'stripe' segment types. The layering
	#     is done by creating a mirror LV on top of striped sub-LVs,
	#     effectively creating a RAID 0+1 array. The layering is suboptimal
	#     in terms of providing redundancy and performance.
	#
	# This configuration option has an automatic default value.
	# raid10_segtype_default = "raid10"

# Configuration option global/sparse_segtype_default.
	# The segment type used by the -V -L combination.
	# The --type snapshot|thin option overrides this setting.
	# The combination of -V and -L options creates a sparse LV. There are
	# two different implementations.
	#
	# Accepted values:
	#   snapshot
	#     The original snapshot implementation from LVM/DM. It uses an old
	#     snapshot that mixes data and metadata within a single COW
	#     storage volume and performs poorly when the size of stored data
	#     passes hundreds of MB.
	#   thin
	#     A newer implementation that uses thin provisioning. It has a
	#     bigger minimal chunk size (64KiB) and uses a separate volume for
	#     metadata. It has better performance, especially when more data
	#     is used. It also supports full snapshots.
	#
	# This configuration option has an automatic default value.
	# sparse_segtype_default = "thin"

# Configuration option global/lvdisplay_shows_full_device_path.
	# Enable this to reinstate the previous lvdisplay name format.
	# The default format for displaying LV names in lvdisplay was changed
	# in version 2.02.89 to show the LV name and path separately.
	# Previously this was always shown as /dev/vgname/lvname even when that
	# was never a valid path in the /dev filesystem.
	# This configuration option has an automatic default value.
	# lvdisplay_shows_full_device_path = 0

# Configuration option global/event_activation.
	# Disable event based autoactivation commands.
	# WARNING: setting this to zero may cause machine startup to fail.
	# Previously, setting this to zero would enable static autoactivation
	# services (via the lvm2-activation-generator), but the autoactivation
	# services and generator have been removed.
	# This configuration option has an automatic default value.
	# event_activation = 1

# Configuration option global/use_aio.
	# Use async I/O when reading and writing devices.
	# This configuration option has an automatic default value.
	# use_aio = 1

# Configuration option global/use_lvmlockd.
	# Use lvmlockd for locking among hosts using LVM on shared storage.
	# Applicable only if LVM is compiled with lockd support in which
	# case there is also lvmlockd(8) man page available for more
	# information.
	# This configuration option has an automatic default value.
	use_lvmlockd = 0

# Configuration option global/lvmlockd_lock_retries.
	# Retry lvmlockd lock requests this many times.
	# Applicable only if LVM is compiled with lockd support
	# This configuration option has an automatic default value.
	# lvmlockd_lock_retries = 3

# Configuration option global/sanlock_lv_extend.
	# Size in MiB to extend the internal LV holding sanlock locks.
	# The internal LV holds locks for each LV in the VG, and after enough
	# LVs have been created, the internal LV needs to be extended. lvcreate
	# will automatically extend the internal LV when needed by the amount
	# specified here. Setting this to 0 disables the automatic extension
	# and can cause lvcreate to fail. Applicable only if LVM is compiled
	# with lockd support
	# This configuration option has an automatic default value.
	# sanlock_lv_extend = 256

# Configuration option global/lvmlockctl_kill_command.
	# The command that lvmlockctl --kill should use to force LVs offline.
	# The lvmlockctl --kill command is run when a shared VG has lost
	# access to locks (e.g. when sanlock has lost access to storage.)
	# An empty string means that there will be no automatic attempt by
	# lvmlockctl --kill to forcibly shut down LVs in the VG, and the user
	# can manually intervene as described in lvmlockd(8).
	# The VG name will be appended to the command specified here.
	# This configuration option has an automatic default value.
	# lvmlockctl_kill_command = ""

# Configuration option global/thin_check_executable.
	# The full path to the thin_check command.
	# LVM uses this command to check that a thin metadata device is in a
	# usable state. When a thin pool is activated and after it is
	# deactivated, this command is run. Activation will only proceed if
	# the command has an exit status of 0. Set to "" to skip this check.
	# (Not recommended.) Also see thin_check_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# thin_check_executable = "/usr/sbin/thin_check"

# Configuration option global/thin_dump_executable.
	# The full path to the thin_dump command.
	# LVM uses this command to dump thin pool metadata.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# thin_dump_executable = "/usr/sbin/thin_dump"

# Configuration option global/thin_repair_executable.
	# The full path to the thin_repair command.
	# LVM uses this command to repair a thin metadata device if it is in
	# an unusable state. Also see thin_repair_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# thin_repair_executable = "/usr/sbin/thin_repair"

# Configuration option global/thin_check_options.
	# List of options passed to the thin_check command.
	# With thin_check version 2.1 or newer you can add the option
	# --ignore-non-fatal-errors to let it pass through ignorable errors
	# and fix them later. With thin_check version 3.2 or newer you should
	# include the option --clear-needs-check-flag.
	# This configuration option has an automatic default value.
	# thin_check_options = [ "-q", "--clear-needs-check-flag" ]

# Configuration option global/thin_repair_options.
	# List of options passed to the thin_repair command.
	# This configuration option has an automatic default value.
	# thin_repair_options = [ "" ]

# Configuration option global/thin_disabled_features.
	# Features to not use in the thin driver.
	# This can be helpful for testing, or to avoid using a feature that is
	# causing problems. Features include: block_size, discards,
	# discards_non_power_2, external_origin, metadata_resize,
	# external_origin_extend, error_if_no_space.
	#
	# Example
	# thin_disabled_features = [ "discards", "block_size" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option global/cache_disabled_features.
	# Features to not use in the cache driver.
	# This can be helpful for testing, or to avoid using a feature that is
	# causing problems. Features include: policy_mq, policy_smq, metadata2.
	#
	# Example
	# cache_disabled_features = [ "policy_smq" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option global/cache_check_executable.
	# The full path to the cache_check command.
	# LVM uses this command to check that a cache metadata device is in a
	# usable state. When a cached LV is activated and after it is
	# deactivated, this command is run. Activation will only proceed if the
	# command has an exit status of 0. Set to "" to skip this check.
	# (Not recommended.) Also see cache_check_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# cache_check_executable = "/usr/sbin/cache_check"

# Configuration option global/cache_dump_executable.
	# The full path to the cache_dump command.
	# LVM uses this command to dump cache pool metadata.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# cache_dump_executable = "/usr/sbin/cache_dump"

# Configuration option global/cache_repair_executable.
	# The full path to the cache_repair command.
	# LVM uses this command to repair a cache metadata device if it is in
	# an unusable state. Also see cache_repair_options.
	# (See package device-mapper-persistent-data or thin-provisioning-tools)
	# This configuration option has an automatic default value.
	# cache_repair_executable = "/usr/sbin/cache_repair"

# Configuration option global/cache_check_options.
	# List of options passed to the cache_check command.
	# With cache_check version 5.0 or newer you should include the option
	# --clear-needs-check-flag.
	# This configuration option has an automatic default value.
	# cache_check_options = [ "-q", "--clear-needs-check-flag" ]

# Configuration option global/cache_repair_options.
	# List of options passed to the cache_repair command.
	# This configuration option has an automatic default value.
	# cache_repair_options = [ "" ]

# Configuration option global/vdo_format_executable.
	# The full path to the vdoformat command.
	# LVM uses this command to initial data volume for VDO type logical volume
	# This configuration option has an automatic default value.
	# vdo_format_executable = "/usr/bin/vdoformat"

# Configuration option global/vdo_format_options.
	# List of options passed added to standard vdoformat command.
	# This configuration option has an automatic default value.
	# vdo_format_options = [ "" ]

# Configuration option global/vdo_disabled_features.
	# Features to not use in the vdo driver.
	# This can be helpful for testing, or to avoid using a feature that is
	# causing problems. Features include: online_rename
	#
	# Example
	# vdo_disabled_features = [ "online_rename" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option global/fsadm_executable.
	# The full path to the fsadm command.
	# LVM uses this command to help with lvresize -r operations.
	# This configuration option has an automatic default value.
	# fsadm_executable = "/sbin/fsadm"

# Configuration option global/system_id_source.
	# The method LVM uses to set the local system ID.
	# Volume Groups can also be given a system ID (by vgcreate, vgchange,
	# or vgimport.) A VG on shared storage devices is accessible only to
	# the host with a matching system ID. See 'man lvmsystemid' for
	# information on limitations and correct usage.
	#
	# Accepted values:
	#   none
	#     The host has no system ID.
	#   lvmlocal
	#     Obtain the system ID from the system_id setting in the 'local'
	#     section of an lvm configuration file, e.g. lvmlocal.conf.
	#   uname
	#     Set the system ID from the hostname (uname) of the system.
	#     System IDs beginning localhost are not permitted.
	#   appmachineid
	#     Use an LVM-specific derivation of the local machine-id as the
	#     system ID. See 'man machine-id'.
	#   machineid
	#     Use the contents of the machine-id file to set the system ID
	#     (appmachineid is recommended.)
	#   file
	#     Use the contents of another file (system_id_file) to set the
	#     system ID.
	#
	# This configuration option has an automatic default value.
	# system_id_source = "none"

# Configuration option global/system_id_file.
	# The full path to the file containing a system ID.
	# This is used when system_id_source is set to 'file'.
	# Comments starting with the character # are ignored.
	# This configuration option does not have a default value defined.

# Configuration option global/use_lvmpolld.
	# Use lvmpolld to supervise long running LVM commands.
	# When enabled, control of long running LVM commands is transferred
	# from the original LVM command to the lvmpolld daemon. This allows
	# the operation to continue independent of the original LVM command.
	# After lvmpolld takes over, the LVM command displays the progress
	# of the ongoing operation. lvmpolld itself runs LVM commands to
	# manage the progress of ongoing operations. lvmpolld can be used as
	# a native systemd service, which allows it to be started on demand,
	# and to use its own control group. When this option is disabled, LVM
	# commands will supervise long running operations by forking themselves.
	# Applicable only if LVM is compiled with lvmpolld support.
	# This configuration option has an automatic default value.
	# use_lvmpolld = 0
	use_lvmpolld = 1

# Configuration option global/notify_dbus.
	# Enable D-Bus notification from LVM commands.
	# When enabled, an LVM command that changes PVs, changes VG metadata,
	# or changes the activation state of an LV will send a notification.
	# This configuration option has an automatic default value.
	# notify_dbus = 1

# Configuration option global/io_memory_size.
	# The amount of memory in KiB that LVM allocates to perform disk io.
	# LVM performance may benefit from more io memory when there are many
	# disks or VG metadata is large. Increasing this size may be necessary
	# when a single copy of VG metadata is larger than the current setting.
	# This value should usually not be decreased from the default; setting
	# it too low can result in lvm failing to read VGs.
	# This configuration option has an automatic default value.
	# io_memory_size = 8192
}

# Configuration section activation.
activation {

# Configuration option activation/checks.
	# Perform internal checks of libdevmapper operations.
	# Useful for debugging problems with activation. Some of the checks may
	# be expensive, so it's best to use this only when there seems to be a
	# problem.
	# This configuration option has an automatic default value.
	# checks = 0

# Configuration option activation/udev_sync.
	# Use udev notifications to synchronize udev and LVM.
	# The --noudevsync option overrides this setting.
	# When disabled, LVM commands will not wait for notifications from
	# udev, but continue irrespective of any possible udev processing in
	# the background. Only use this if udev is not running or has rules
	# that ignore the devices LVM creates. If enabled when udev is not
	# running, and LVM processes are waiting for udev, run the command
	# 'dmsetup udevcomplete_all' to wake them up.
	# This configuration option has an automatic default value.
	# udev_sync = 1

# Configuration option activation/udev_rules.
	# Use udev rules to manage LV device nodes and symlinks.
	# When disabled, LVM will manage the device nodes and symlinks for
	# active LVs itself. Manual intervention may be required if this
	# setting is changed while LVs are active.
	# This configuration option has an automatic default value.
	# udev_rules = 1

# Configuration option activation/verify_udev_operations.
	# Use extra checks in LVM to verify udev operations.
	# This enables additional checks (and if necessary, repairs) on entries
	# in the device directory after udev has completed processing its
	# events. Useful for diagnosing problems with LVM/udev interactions.
	# This configuration option has an automatic default value.
	# verify_udev_operations = 0

# Configuration option activation/retry_deactivation.
	# Retry failed LV deactivation.
	# If LV deactivation fails, LVM will retry for a few seconds before
	# failing. This may happen because a process run from a quick udev rule
	# temporarily opened the device.
	# This configuration option has an automatic default value.
	# retry_deactivation = 1

# Configuration option activation/missing_stripe_filler.
	# Method to fill missing stripes when activating an incomplete LV.
	# Using 'error' will make inaccessible parts of the device return I/O
	# errors on access. Using 'zero' will return success (and zero) on I/O
	# You can instead use a device path, in which case,
	# that device will be used in place of missing stripes. Using anything
	# other than 'error' with mirrored or snapshotted volumes is likely to
	# result in data corruption.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# missing_stripe_filler = "error"

# Configuration option activation/use_linear_target.
	# Use the linear target to optimize single stripe LVs.
	# When disabled, the striped target is used. The linear target is an
	# optimised version of the striped target that only handles a single
	# stripe.
	# This configuration option has an automatic default value.
	# use_linear_target = 1

# Configuration option activation/reserved_stack.
	# Stack size in KiB to reserve for use while devices are suspended.
	# Insufficent reserve risks I/O deadlock during device suspension.
	# This configuration option has an automatic default value.
	# reserved_stack = 64

# Configuration option activation/reserved_memory.
	# Memory size in KiB to reserve for use while devices are suspended.
	# Insufficent reserve risks I/O deadlock during device suspension.
	# This configuration option has an automatic default value.
	# reserved_memory = 8192

# Configuration option activation/process_priority.
	# Nice value used while devices are suspended.
	# Use a high priority so that LVs are suspended
	# for the shortest possible time.
	# This configuration option has an automatic default value.
	# process_priority = -18

# Configuration option activation/volume_list.
	# Only LVs selected by this list are activated.
	# If this list is defined, an LV is only activated if it matches an
	# entry in this list. If this list is undefined, it imposes no limits
	# on LV activation (all are allowed).
	#
	# Accepted values:
	#   vgname
	#     The VG name is matched exactly and selects all LVs in the VG.
	#   vgname/lvname
	#     The VG name and LV name are matched exactly and selects the LV.
	#   @tag
	#     Selects an LV if the specified tag matches a tag set on the LV
	#     or VG.
	#   @*
	#     Selects an LV if a tag defined on the host is also set on the LV
	#     or VG. See tags/hosttags. If any host tags exist but volume_list
	#     is not defined, a default single-entry list containing '@*'
	#     is assumed.
	#
	# Example
	# volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option activation/auto_activation_volume_list.
	# A list of VGs or LVs that should be autoactivated.
	# Autoactivation is an activation command run with -aay,
	# i.e. vgchange -aay, lvchange -aay, or pvscan --cache -aay.
	# When this list is defined, an autoactivation command will only
	# activate LVs included in the list. If this list is undefined,
	# it has no effect. If this list is defined but empty, then no
	# LVs will be autoactivated. LVs can be included in the list by
	# LV name, VG name (applies to all LVs in the VG), or tag name.
	# VGs and LVs can also have an autoactivation property set in
	# metadata, see --setautoactivation. LVs included in this list
	# will not be autoactivated if the VG or LV autoactivation
	# property is disabled (see vgs or lvs "-o autoactivation").
	# The volume_list setting and the "activation skip" property
	# also apply to autoactivation.
	# The -aay option is meant to be used by activation commands that
	# are run automatically by the system, e.g. from systemd services.
	#
	# Accepted values:
	#   vgname
	#     The VG name is matched exactly and selects all LVs in the VG.
	#   vgname/lvname
	#     The VG name and LV name are matched exactly and selects the LV.
	#   @tag
	#     Selects an LV if the specified tag matches a tag set on the LV
	#     or VG.
	#   @*
	#     Selects an LV if a tag defined on the host is also set on the LV
	#     or VG. See tags/hosttags. If any host tags exist but volume_list
	#     is not defined, a default single-entry list containing '@*'
	#     is assumed.
	#
	# Example
	# auto_activation_volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option activation/read_only_volume_list.
	# LVs in this list are activated in read-only mode.
	# If this list is defined, each LV that is to be activated is checked
	# against this list, and if it matches, it is activated in read-only
	# mode. This overrides the permission setting stored in the metadata,
	# e.g. from --permission rw.
	#
	# Accepted values:
	#   vgname
	#     The VG name is matched exactly and selects all LVs in the VG.
	#   vgname/lvname
	#     The VG name and LV name are matched exactly and selects the LV.
	#   @tag
	#     Selects an LV if the specified tag matches a tag set on the LV
	#     or VG.
	#   @*
	#     Selects an LV if a tag defined on the host is also set on the LV
	#     or VG. See tags/hosttags. If any host tags exist but volume_list
	#     is not defined, a default single-entry list containing '@*'
	#     is assumed.
	#
	# Example
	# read_only_volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
	#
	# This configuration option does not have a default value defined.

# Configuration option activation/raid_region_size.
	# Size in KiB of each raid or mirror synchronization region.
	# The clean/dirty state of data is tracked for each region.
	# The value is rounded down to a power of two if necessary, and
	# is ignored if it is not a multiple of the machine memory page size.
	# This configuration option has an automatic default value.
	# raid_region_size = 2048

# Configuration option activation/error_when_full.
	# Return errors if a thin pool runs out of space.
	# The --errorwhenfull option overrides this setting.
	# When enabled, writes to thin LVs immediately return an error if the
	# thin pool is out of data space. When disabled, writes to thin LVs
	# are queued if the thin pool is out of space, and processed when the
	# thin pool data space is extended. New thin pools are assigned the
	# behavior defined here.
	# This configuration option has an automatic default value.
	# error_when_full = 0

# Configuration option activation/readahead.
	# Setting to use when there is no readahead setting in metadata.
	#
	# Accepted values:
	#   none
	#     Disable readahead.
	#   auto
	#     Use default value chosen by kernel.
	#
	# This configuration option has an automatic default value.
	# readahead = "auto"

# Configuration option activation/raid_fault_policy.
	# Defines how a device failure in a RAID LV is handled.
	# This includes LVs that have the following segment types:
	# raid1, raid4, raid5*, and raid6*.
	# If a device in the LV fails, the policy determines the steps
	# performed by dmeventd automatically, and the steps perfomed by the
	# manual command lvconvert --repair --use-policies.
	# Automatic handling requires dmeventd to be monitoring the LV.
	#
	# Accepted values:
	#   warn
	#     Use the system log to warn the user that a device in the RAID LV
	#     has failed. It is left to the user to run lvconvert --repair
	#     manually to remove or replace the failed device. As long as the
	#     number of failed devices does not exceed the redundancy of the LV
	#     (1 device for raid4/5, 2 for raid6), the LV will remain usable.
	#   allocate
	#     Attempt to use any extra physical volumes in the VG as spares and
	#     replace faulty devices.
	#
	# This configuration option has an automatic default value.
	# raid_fault_policy = "warn"

# Configuration option activation/mirror_image_fault_policy.
	# Defines how a device failure in a 'mirror' LV is handled.
	# An LV with the 'mirror' segment type is composed of mirror images
	# (copies) and a mirror log. A disk log ensures that a mirror LV does
	# not need to be re-synced (all copies made the same) every time a
	# machine reboots or crashes. If a device in the LV fails, this policy
	# determines the steps perfomed by dmeventd automatically, and the steps
	# performed by the manual command lvconvert --repair --use-policies.
	# Automatic handling requires dmeventd to be monitoring the LV.
	#
	# Accepted values:
	#   remove
	#     Simply remove the faulty device and run without it. If the log
	#     device fails, the mirror would convert to using an in-memory log.
	#     This means the mirror will not remember its sync status across
	#     crashes/reboots and the entire mirror will be re-synced. If a
	#     mirror image fails, the mirror will convert to a non-mirrored
	#     device if there is only one remaining good copy.
	#   allocate
	#     Remove the faulty device and try to allocate space on a new
	#     device to be a replacement for the failed device. Using this
	#     policy for the log is fast and maintains the ability to remember
	#     sync state through crashes/reboots. Using this policy for a
	#     mirror device is slow, as it requires the mirror to resynchronize
	#     the devices, but it will preserve the mirror characteristic of
	#     the device. This policy acts like 'remove' if no suitable device
	#     and space can be allocated for the replacement.
	#   allocate_anywhere
	#     Not yet implemented. Useful to place the log device temporarily
	#     on the same physical volume as one of the mirror images. This
	#     policy is not recommended for mirror devices since it would break
	#     the redundant nature of the mirror. This policy acts like
	#     'remove' if no suitable device and space can be allocated for the
	#     replacement.
	#
	# This configuration option has an automatic default value.
	# mirror_image_fault_policy = "remove"

# Configuration option activation/mirror_log_fault_policy.
	# Defines how a device failure in a 'mirror' log LV is handled.
	# The mirror_image_fault_policy description for mirrored LVs also
	# applies to mirrored log LVs.
	# This configuration option has an automatic default value.
	# mirror_log_fault_policy = "allocate"

# Configuration option activation/snapshot_autoextend_threshold.
	# Auto-extend a snapshot when its usage exceeds this percent.
	# Setting this to 100 disables automatic extension.
	# The minimum value is 50 (a smaller value is treated as 50.)
	# Also see snapshot_autoextend_percent.
	# Automatic extension requires dmeventd to be monitoring the LV.
	#
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# snapshot exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# snapshot_autoextend_threshold = 70
	#
	# This configuration option has an automatic default value.
	# snapshot_autoextend_threshold = 100

# Configuration option activation/snapshot_autoextend_percent.
	# Auto-extending a snapshot adds this percent extra space.
	# The amount of additional space added to a snapshot is this
	# percent of its current size.
	#
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# snapshot exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# snapshot_autoextend_percent = 20
	#
	# This configuration option has an automatic default value.
	# snapshot_autoextend_percent = 20

# Configuration option activation/thin_pool_autoextend_threshold.
	# Auto-extend a thin pool when its usage exceeds this percent.
	# Setting this to 100 disables automatic extension.
	# The minimum value is 50 (a smaller value is treated as 50.)
	# Also see thin_pool_autoextend_percent.
	# Automatic extension requires dmeventd to be monitoring the LV.
	#
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# thin pool exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# thin_pool_autoextend_threshold = 70
	#
	# This configuration option has an automatic default value.
	# thin_pool_autoextend_threshold = 100

# Configuration option activation/thin_pool_autoextend_percent.
	# Auto-extending a thin pool adds this percent extra space.
	# The amount of additional space added to a thin pool is this
	# percent of its current size.
	#
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 1G
	# thin pool exceeds 700M, it is extended to 1.2G, and when it exceeds
	# 840M, it is extended to 1.44G:
	# thin_pool_autoextend_percent = 20
	#
	# This configuration option has an automatic default value.
	# thin_pool_autoextend_percent = 20

# Configuration option activation/vdo_pool_autoextend_threshold.
	# Auto-extend a VDO pool when its usage exceeds this percent.
	# Setting this to 100 disables automatic extension.
	# The minimum value is 50 (a smaller value is treated as 50.)
	# Also see vdo_pool_autoextend_percent.
	# Automatic extension requires dmeventd to be monitoring the LV.
	#
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 10G
	# VDO pool exceeds 7G, it is extended to 12G, and when it exceeds
	# 8.4G, it is extended to 14.4G:
	# vdo_pool_autoextend_threshold = 70
	#
	# This configuration option has an automatic default value.
	# vdo_pool_autoextend_threshold = 100

# Configuration option activation/vdo_pool_autoextend_percent.
	# Auto-extending a VDO pool adds this percent extra space.
	# The amount of additional space added to a VDO pool is this
	# percent of its current size.
	#
	# Example
	# Using 70% autoextend threshold and 20% autoextend size, when a 10G
	# VDO pool exceeds 7G, it is extended to 12G, and when it exceeds
	# 8.4G, it is extended to 14.4G:
	# This configuration option has an automatic default value.
	# vdo_pool_autoextend_percent = 20

# Configuration option activation/mlock_filter.
	# Do not mlock these memory areas.
	# While activating devices, I/O to devices being (re)configured is
	# suspended. As a precaution against deadlocks, LVM pins memory it is
	# using so it is not paged out, and will not require I/O to reread.
	# Groups of pages that are known not to be accessed during activation
	# do not need to be pinned into memory. Each string listed in this
	# setting is compared against each line in /proc/self/maps, and the
	# pages corresponding to lines that match are not pinned. On some
	# systems, locale-archive was found to make up over 80% of the memory
	# used by the process.
	#
	# Example
	# mlock_filter = [ "locale/locale-archive", "gconv/gconv-modules.cache" ]
	#
	# This configuration option is advanced.
	# This configuration option does not have a default value defined.

# Configuration option activation/use_mlockall.
	# Use the old behavior of mlockall to pin all memory.
	# Prior to version 2.02.62, LVM used mlockall() to pin the whole
	# process's memory while activating devices.
	# This configuration option has an automatic default value.
	# use_mlockall = 0

# Configuration option activation/monitoring.
	# Monitor LVs that are activated.
	# The --ignoremonitoring option overrides this setting.
	# When enabled, LVM will ask dmeventd to monitor activated LVs.
	# This configuration option has an automatic default value.
	# monitoring = 1

# Configuration option activation/polling_interval.
	# Check pvmove or lvconvert progress at this interval (seconds).
	# When pvmove or lvconvert must wait for the kernel to finish
	# synchronising or merging data, they check and report progress at
	# intervals of this number of seconds. If this is set to 0 and there
	# is only one thing to wait for, there are no progress reports, but
	# the process is awoken immediately once the operation is complete.
	# This configuration option has an automatic default value.
	# polling_interval = 15

# Configuration option activation/auto_set_activation_skip.
	# Set the activation skip flag on new thin snapshot LVs.
	# The --setactivationskip option overrides this setting.
	# An LV can have a persistent 'activation skip' flag. The flag causes
	# the LV to be skipped during normal activation. The lvchange/vgchange
	# -K option is required to activate LVs that have the activation skip
	# flag set. When this setting is enabled, the activation skip flag is
	# set on new thin snapshot LVs.
	# This configuration option has an automatic default value.
	# auto_set_activation_skip = 1

# Configuration option activation/activation_mode.
	# How LVs with missing devices are activated.
	# The --activationmode option overrides this setting.
	#
	# Accepted values:
	#   complete
	#     Only allow activation of an LV if all of the Physical Volumes it
	#     uses are present. Other PVs in the Volume Group may be missing.
	#   degraded
	#     Like complete, but additionally RAID LVs of segment type raid1,
	#     raid4, raid5, radid6 and raid10 will be activated if there is no
	#     data loss, i.e. they have sufficient redundancy to present the
	#     entire addressable range of the Logical Volume.
	#   partial
	#     Allows the activation of any LV even if a missing or failed PV
	#     could cause data loss with a portion of the LV inaccessible.
	#     This setting should not normally be used, but may sometimes
	#     assist with data recovery.
	#
	# This configuration option has an automatic default value.
	# activation_mode = "degraded"

# Configuration option activation/lock_start_list.
	# Locking is started only for VGs selected by this list.
	# The rules are the same as those for volume_list.
	# This configuration option does not have a default value defined.

# Configuration option activation/auto_lock_start_list.
	# Locking is auto-started only for VGs selected by this list.
	# The rules are the same as those for auto_activation_volume_list.
	# This configuration option does not have a default value defined.
}

# Configuration section metadata.
# This configuration section has an automatic default value.
# metadata {

# Configuration option metadata/check_pv_device_sizes.
	# Check device sizes are not smaller than corresponding PV sizes.
	# If device size is less than corresponding PV size found in metadata,
	# there is always a risk of data loss. If this option is set, then LVM
	# issues a warning message each time it finds that the device size is
	# less than corresponding PV size. You should not disable this unless
	# you are absolutely sure about what you are doing!
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# check_pv_device_sizes = 1

# Configuration option metadata/record_lvs_history.
	# When enabled, LVM keeps history records about removed LVs in
	# metadata. The information that is recorded in metadata for
	# historical LVs is reduced when compared to original
	# information kept in metadata for live LVs. Currently, this
	# feature is supported for thin and thin snapshot LVs only.
	# This configuration option has an automatic default value.
	# record_lvs_history = 0

# Configuration option metadata/lvs_history_retention_time.
	# Retention time in seconds after which a record about individual
	# historical logical volume is automatically destroyed.
	# A value of 0 disables this feature.
	# This configuration option has an automatic default value.
	# lvs_history_retention_time = 0

# Configuration option metadata/pvmetadatacopies.
	# Number of copies of metadata to store on each PV.
	# The --pvmetadatacopies option overrides this setting.
	#
	# Accepted values:
	#   2
	#     Two copies of the VG metadata are stored on the PV, one at the
	#     front of the PV, and one at the end.
	#   1
	#     One copy of VG metadata is stored at the front of the PV.
	#   0
	#     No copies of VG metadata are stored on the PV. This may be
	#     useful for VGs containing large numbers of PVs.
	#
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# pvmetadatacopies = 1

# Configuration option metadata/vgmetadatacopies.
	# Number of copies of metadata to maintain for each VG.
	# The --vgmetadatacopies option overrides this setting.
	# If set to a non-zero value, LVM automatically chooses which of the
	# available metadata areas to use to achieve the requested number of
	# copies of the VG metadata. If you set a value larger than the the
	# total number of metadata areas available, then metadata is stored in
	# them all. The value 0 (unmanaged) disables this automatic management
	# and allows you to control which metadata areas are used at the
	# individual PV level using pvchange --metadataignore y|n.
	# This configuration option has an automatic default value.
	# vgmetadatacopies = 0

# Configuration option metadata/pvmetadatasize.
	# The default size of the metadata area in units of 512 byte sectors.
	# The metadata area begins at an offset of the page size from the start
	# of the device. The first PE is by default at 1 MiB from the start of
	# the device. The space between these is the default metadata area size.
	# The actual size of the metadata area may be larger than what is set
	# here due to default_data_alignment making the first PE a MiB multiple.
	# The metadata area begins with a 512 byte header and is followed by a
	# circular buffer used for VG metadata text. The maximum size of the VG
	# metadata is about half the size of the metadata buffer. VGs with large
	# numbers of PVs or LVs, or VGs containing complex LV structures, may need
	# additional space for VG metadata. The --metadatasize option overrides
	# this setting.
	# This configuration option does not have a default value defined.

# Configuration option metadata/pvmetadataignore.
	# Ignore metadata areas on a new PV.
	# The --metadataignore option overrides this setting.
	# If metadata areas on a PV are ignored, LVM will not store metadata
	# in them.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# pvmetadataignore = 0

# Configuration option metadata/stripesize.
	# This configuration option is advanced.
	# This configuration option has an automatic default value.
	# stripesize = 64
# }

# Configuration section report.
# LVM report command output formatting.
# This configuration section has an automatic default value.
# report {

# Configuration option report/output_format.
	# Format of LVM command's report output.
	# If there is more than one report per command, then the format
	# is applied for all reports. You can also change output format
	# directly on command line using --reportformat option which
	# has precedence over log/output_format setting.
	# Accepted values:
	#   basic
	#     Original format with columns and rows. If there is more than
	#     one report per command, each report is prefixed with report's
	#     name for identification.
	#   json
	#     JSON format.
	#   json_std
	#     JSON format that is more compliant with JSON standard.
	#     Compared to original "json" format:
	#       - it does not use double quotes around numeric values,
	#       - it uses 'null' for undefined numeric values,
	#       - it prints string list as proper JSON array of strings instead of a single string.
	# This configuration option has an automatic default value.
	# output_format = "basic"

# Configuration option report/compact_output.
	# Do not print empty values for all report fields.
	# If enabled, all fields that don't have a value set for any of the
	# rows reported are skipped and not printed. Compact output is
	# applicable only if report/buffered is enabled. If you need to
	# compact only specified fields, use compact_output=0 and define
	# report/compact_output_cols configuration setting instead.
	# This configuration option has an automatic default value.
	# compact_output = 0

# Configuration option report/compact_output_cols.
	# Do not print empty values for specified report fields.
	# If defined, specified fields that don't have a value set for any
	# of the rows reported are skipped and not printed. Compact output
	# is applicable only if report/buffered is enabled. If you need to
	# compact all fields, use compact_output=1 instead in which case
	# the compact_output_cols setting is then ignored.
	# This configuration option has an automatic default value.
	# compact_output_cols = ""

# Configuration option report/aligned.
	# Align columns in report output.
	# This configuration option has an automatic default value.
	# aligned = 1

# Configuration option report/buffered.
	# Buffer report output.
	# When buffered reporting is used, the report's content is appended
	# incrementally to include each object being reported until the report
	# is flushed to output which normally happens at the end of command
	# execution. Otherwise, if buffering is not used, each object is
	# reported as soon as its processing is finished.
	# This configuration option has an automatic default value.
	# buffered = 1

# Configuration option report/headings.
	# Show headings for columns on report.
	# This configuration option has an automatic default value.
	# headings = 1

# Configuration option report/separator.
	# A separator to use on report after each field.
	# This configuration option has an automatic default value.
	# separator = " "

# Configuration option report/list_item_separator.
	# A separator to use for list items when reported.
	# This configuration option has an automatic default value.
	# list_item_separator = ","

# Configuration option report/prefixes.
	# Use a field name prefix for each field reported.
	# This configuration option has an automatic default value.
	# prefixes = 0

# Configuration option report/quoted.
	# Quote field values when using field name prefixes.
	# This configuration option has an automatic default value.
	# quoted = 1

# Configuration option report/columns_as_rows.
	# Output each column as a row.
	# If set, this also implies report/prefixes=1.
	# This configuration option has an automatic default value.
	# columns_as_rows = 0

# Configuration option report/binary_values_as_numeric.
	# Use binary values 0 or 1 instead of descriptive literal values.
	# For columns that have exactly two valid values to report
	# (not counting the 'unknown' value which denotes that the
	# value could not be determined).
	# This configuration option has an automatic default value.
	# binary_values_as_numeric = 0

# Configuration option report/time_format.
	# Set time format for fields reporting time values.
	# Format specification is a string which may contain special character
	# sequences and ordinary character sequences. Ordinary character
	# sequences are copied verbatim. Each special character sequence is
	# introduced by the '%' character and such sequence is then
	# substituted with a value as described below.
	#
	# Accepted values:
	#   %a
	#     The abbreviated name of the day of the week according to the
	#     current locale.
	#   %A
	#     The full name of the day of the week according to the current
	#     locale.
	#   %b
	#     The abbreviated month name according to the current locale.
	#   %B
	#     The full month name according to the current locale.
	#   %c
	#     The preferred date and time representation for the current
	#     locale (alt E)
	#   %C
	#     The century number (year/100) as a 2-digit integer. (alt E)
	#   %d
	#     The day of the month as a decimal number (range 01 to 31).
	#     (alt O)
	#   %D
	#     Equivalent to %m/%d/%y. (For Americans only. Americans should
	#     note that in other countries%d/%m/%y is rather common. This
	#     means that in international context this format is ambiguous and
	#     should not be used.
	#   %e
	#     Like %d, the day of the month as a decimal number, but a leading
	#     zero is replaced by a space. (alt O)
	#   %E
	#     Modifier: use alternative local-dependent representation if
	#     available.
	#   %F
	#     Equivalent to %Y-%m-%d (the ISO 8601 date format).
	#   %G
	#     The ISO 8601 week-based year with century as adecimal number.
	#     The 4-digit year corresponding to the ISO week number (see %V).
	#     This has the same format and value as %Y, except that if the
	#     ISO week number belongs to the previous or next year, that year
	#     is used instead.
	#   %g
	#     Like %G, but without century, that is, with a 2-digit year
	#     (00-99).
	#   %h
	#     Equivalent to %b.
	#   %H
	#     The hour as a decimal number using a 24-hour clock
	#     (range 00 to 23). (alt O)
	#   %I
	#     The hour as a decimal number using a 12-hour clock
	#     (range 01 to 12). (alt O)
	#   %j
	#     The day of the year as a decimal number (range 001 to 366).
	#   %k
	#     The hour (24-hour clock) as a decimal number (range 0 to 23);
	#     single digits are preceded by a blank. (See also %H.)
	#   %l
	#     The hour (12-hour clock) as a decimal number (range 1 to 12);
	#     single digits are preceded by a blank. (See also %I.)
	#   %m
	#     The month as a decimal number (range 01 to 12). (alt O)
	#   %M
	#     The minute as a decimal number (range 00 to 59). (alt O)
	#   %O
	#     Modifier: use alternative numeric symbols.
	#   %p
	#     Either "AM" or "PM" according to the given time value,
	#     or the corresponding strings for the current locale. Noon is
	#     treated as "PM" and midnight as "AM".
	#   %P
	#     Like %p but in lowercase: "am" or "pm" or a corresponding
	#     string for the current locale.
	#   %r
	#     The time in a.m. or p.m. notation. In the POSIX locale this is
	#     equivalent to %I:%M:%S %p.
	#   %R
	#     The time in 24-hour notation (%H:%M). For a version including
	#     the seconds, see %T below.
	#   %s
	#     The number of seconds since the Epoch,
	#     1970-01-01 00:00:00 +0000 (UTC)
	#   %S
	#     The second as a decimal number (range 00 to 60). (The range is
	#     up to 60 to allow for occasional leap seconds.) (alt O)
	#   %t
	#     A tab character.
	#   %T
	#     The time in 24-hour notation (%H:%M:%S).
	#   %u
	#     The day of the week as a decimal, range 1 to 7, Monday being 1.
	#     See also %w. (alt O)
	#   %U
	#     The week number of the current year as a decimal number,
	#     range 00 to 53, starting with the first Sunday as the first
	#     day of week 01. See also %V and %W. (alt O)
	#   %V
	#     The ISO 8601 week number of the current year as a decimal number,
	#     range 01 to 53, where week 1 is the first week that has at least
	#     4 days in the new year. See also %U and %W. (alt O)
	#   %w
	#     The day of the week as a decimal, range 0 to 6, Sunday being 0.
	#     See also %u. (alt O)
	#   %W
	#     The week number of the current year as a decimal number,
	#     range 00 to 53, starting with the first Monday as the first day
	#     of week 01. (alt O)
	#   %x
	#     The preferred date representation for the current locale without
	#     the time. (alt E)
	#   %X
	#     The preferred time representation for the current locale without
	#     the date. (alt E)
	#   %y
	#     The year as a decimal number without a century (range 00 to 99).
	#     (alt E, alt O)
	#   %Y
	#     The year as a decimal number including the century. (alt E)
	#   %z
	#     The +hhmm or -hhmm numeric timezone (that is, the hour and minute
	#     offset from UTC).
	#   %Z
	#     The timezone name or abbreviation.
	#   %%
	#     A literal '%' character.
	#
	# This configuration option has an automatic default value.
	# time_format = "%Y-%m-%d %T %z"

# Configuration option report/devtypes_sort.
	# List of columns to sort by when reporting 'lvm devtypes' command.
	# See 'lvm devtypes -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# devtypes_sort = "devtype_name"

# Configuration option report/devtypes_cols.
	# List of columns to report for 'lvm devtypes' command.
	# See 'lvm devtypes -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# devtypes_cols = "devtype_name,devtype_max_partitions,devtype_description"

# Configuration option report/devtypes_cols_verbose.
	# List of columns to report for 'lvm devtypes' command in verbose mode.
	# See 'lvm devtypes -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# devtypes_cols_verbose = "devtype_name,devtype_max_partitions,devtype_description"

# Configuration option report/lvs_sort.
	# List of columns to sort by when reporting 'lvs' command.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_sort = "vg_name,lv_name"

# Configuration option report/lvs_cols.
	# List of columns to report for 'lvs' command.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_cols = "lv_name,vg_name,lv_attr,lv_size,pool_lv,origin,data_percent,metadata_percent,move_pv,mirror_log,copy_percent,convert_lv"

# Configuration option report/lvs_cols_verbose.
	# List of columns to report for 'lvs' command in verbose mode.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_cols_verbose = "lv_name,vg_name,seg_count,lv_attr,lv_size,lv_major,lv_minor,lv_kernel_major,lv_kernel_minor,pool_lv,origin,data_percent,metadata_percent,move_pv,copy_percent,mirror_log,convert_lv,lv_uuid,lv_profile"

# Configuration option report/vgs_sort.
	# List of columns to sort by when reporting 'vgs' command.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_sort = "vg_name"

# Configuration option report/vgs_cols.
	# List of columns to report for 'vgs' command.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_cols = "vg_name,pv_count,lv_count,snap_count,vg_attr,vg_size,vg_free"

# Configuration option report/vgs_cols_verbose.
	# List of columns to report for 'vgs' command in verbose mode.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_cols_verbose = "vg_name,vg_attr,vg_extent_size,pv_count,lv_count,snap_count,vg_size,vg_free,vg_uuid,vg_profile"

# Configuration option report/pvs_sort.
	# List of columns to sort by when reporting 'pvs' command.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_sort = "pv_name"

# Configuration option report/pvs_cols.
	# List of columns to report for 'pvs' command.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_cols = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free"

# Configuration option report/pvs_cols_verbose.
	# List of columns to report for 'pvs' command in verbose mode.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_cols_verbose = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,dev_size,pv_uuid"

# Configuration option report/segs_sort.
	# List of columns to sort by when reporting 'lvs --segments' command.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_sort = "vg_name,lv_name,seg_start"

# Configuration option report/segs_cols.
	# List of columns to report for 'lvs --segments' command.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_cols = "lv_name,vg_name,lv_attr,stripes,segtype,seg_size"

# Configuration option report/segs_cols_verbose.
	# List of columns to report for 'lvs --segments' command in verbose mode.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_cols_verbose = "lv_name,vg_name,lv_attr,seg_start,seg_size,stripes,segtype,stripesize,chunksize"

# Configuration option report/pvsegs_sort.
	# List of columns to sort by when reporting 'pvs --segments' command.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_sort = "pv_name,pvseg_start"

# Configuration option report/pvsegs_cols.
	# List of columns to sort by when reporting 'pvs --segments' command.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_cols = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,pvseg_start,pvseg_size"

# Configuration option report/pvsegs_cols_verbose.
	# List of columns to sort by when reporting 'pvs --segments' command in verbose mode.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_cols_verbose = "pv_name,vg_name,pv_fmt,pv_attr,pv_size,pv_free,pvseg_start,pvseg_size,lv_name,seg_start_pe,segtype,seg_pe_ranges"

# Configuration option report/vgs_cols_full.
	# List of columns to report for lvm fullreport's 'vgs' subreport.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_cols_full = "vg_all"

# Configuration option report/pvs_cols_full.
	# List of columns to report for lvm fullreport's 'vgs' subreport.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_cols_full = "pv_all"

# Configuration option report/lvs_cols_full.
	# List of columns to report for lvm fullreport's 'lvs' subreport.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_cols_full = "lv_all"

# Configuration option report/pvsegs_cols_full.
	# List of columns to report for lvm fullreport's 'pvseg' subreport.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_cols_full = "pvseg_all,pv_uuid,lv_uuid"

# Configuration option report/segs_cols_full.
	# List of columns to report for lvm fullreport's 'seg' subreport.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_cols_full = "seg_all,lv_uuid"

# Configuration option report/vgs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'vgs' subreport.
	# See 'vgs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# vgs_sort_full = "vg_name"

# Configuration option report/pvs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'vgs' subreport.
	# See 'pvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvs_sort_full = "pv_name"

# Configuration option report/lvs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'lvs' subreport.
	# See 'lvs -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# lvs_sort_full = "vg_name,lv_name"

# Configuration option report/pvsegs_sort_full.
	# List of columns to sort by when reporting for lvm fullreport's 'pvseg' subreport.
	# See 'pvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# pvsegs_sort_full = "pv_uuid,pvseg_start"

# Configuration option report/segs_sort_full.
	# List of columns to sort by when reporting lvm fullreport's 'seg' subreport.
	# See 'lvs --segments -o help' for the list of possible fields.
	# This configuration option has an automatic default value.
	# segs_sort_full = "lv_uuid,seg_start"

# Configuration option report/mark_hidden_devices.
	# Use brackets [] to mark hidden devices.
	# This configuration option has an automatic default value.
	# mark_hidden_devices = 1

# Configuration option report/two_word_unknown_device.
	# Use the two words 'unknown device' in place of '[unknown]'.
	# This is displayed when the device for a PV is not known.
	# This configuration option has an automatic default value.
	# two_word_unknown_device = 0
# }

# Configuration section dmeventd.
# Settings for the LVM event daemon.
dmeventd {

# Configuration option dmeventd/mirror_library.
	# The library dmeventd uses when monitoring a mirror device.
	# libdevmapper-event-lvm2mirror.so attempts to recover from
	# failures. It removes failed devices from a volume group and
	# reconfigures a mirror as necessary. If no mirror library is
	# provided, mirrors are not monitored through dmeventd.
	# This configuration option has an automatic default value.
	# mirror_library = "libdevmapper-event-lvm2mirror.so"

# Configuration option dmeventd/raid_library.
	# This configuration option has an automatic default value.
	# raid_library = "libdevmapper-event-lvm2raid.so"

# Configuration option dmeventd/snapshot_library.
	# The library dmeventd uses when monitoring a snapshot device.
	# libdevmapper-event-lvm2snapshot.so monitors the filling of snapshots
	# and emits a warning through syslog when the usage exceeds 80%. The
	# warning is repeated when 85%, 90% and 95% of the snapshot is filled.
	# This configuration option has an automatic default value.
	# snapshot_library = "libdevmapper-event-lvm2snapshot.so"

# Configuration option dmeventd/thin_library.
	# The library dmeventd uses when monitoring a thin device.
	# libdevmapper-event-lvm2thin.so monitors the filling of a pool
	# and emits a warning through syslog when the usage exceeds 80%. The
	# warning is repeated when 85%, 90% and 95% of the pool is filled.
	# This configuration option has an automatic default value.
	# thin_library = "libdevmapper-event-lvm2thin.so"

# Configuration option dmeventd/thin_command.
	# The plugin runs command with each 5% increment when thin-pool data volume
	# or metadata volume gets above 50%.
	# Command which starts with 'lvm ' prefix is internal lvm command.
	# You can write your own handler to customise behaviour in more details.
	# User handler is specified with the full path starting with '/'.
	# This configuration option has an automatic default value.
	# thin_command = "lvm lvextend --use-policies"

# Configuration option dmeventd/vdo_library.
	# The library dmeventd uses when monitoring a VDO pool device.
	# libdevmapper-event-lvm2vdo.so monitors the filling of a pool
	# and emits a warning through syslog when the usage exceeds 80%. The
	# warning is repeated when 85%, 90% and 95% of the pool is filled.
	# This configuration option has an automatic default value.
	# vdo_library = "libdevmapper-event-lvm2vdo.so"

# Configuration option dmeventd/vdo_command.
	# The plugin runs command with each 5% increment when VDO pool volume
	# gets above 50%.
	# Command which starts with 'lvm ' prefix is internal lvm command.
	# You can write your own handler to customise behaviour in more details.
	# User handler is specified with the full path starting with '/'.
	# This configuration option has an automatic default value.
	# vdo_command = "lvm lvextend --use-policies"

# Configuration option dmeventd/executable.
	# The full path to the dmeventd binary.
	# This configuration option has an automatic default value.
	# executable = ""
}

# Configuration section tags.
# Host tag settings.
# This configuration section has an automatic default value.
# tags {

# Configuration option tags/hosttags.
	# Create a host tag using the machine name.
	# The machine name is nodename returned by uname(2).
	# This configuration option has an automatic default value.
	# hosttags = 0

# Configuration section tags/<tag>.
	# Replace this subsection name with a custom tag name.
	# Multiple subsections like this can be created. The '@' prefix for
	# tags is optional. This subsection can contain host_list, which is a
	# list of machine names. If the name of the local machine is found in
	# host_list, then the name of this subsection is used as a tag and is
	# applied to the local machine as a 'host tag'. If this subsection is
	# empty (has no host_list), then the subsection name is always applied
	# as a 'host tag'.
	#
	# Example
	# The host tag foo is given to all hosts, and the host tag
	# bar is given to the hosts named machine1 and machine2.
	# tags { foo { } bar { host_list = [ "machine1", "machine2" ] } }
	#
	# This configuration section has variable name.
	# This configuration section has an automatic default value.
	# tag {

# Configuration option tags/<tag>/host_list.
		# A list of machine names.
		# These machine names are compared to the nodename returned
		# by uname(2). If the local machine name matches an entry in
		# this list, the name of the subsection is applied to the
		# machine as a 'host tag'.
		# This configuration option does not have a default value defined.
	# }
# }

Places

File lvm.conf of Package lvm2

Places