File 0005-Add-understanding-output-section-in-man.patch of Package mdadm

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File 0005-Add-understanding-output-section-in-man.patch of Package mdadm (Revision c272612581c301ac3728fa6e8acbfb62)

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From 37eeae381a8ed07a1fabb64184fe45d95a861496 Mon Sep 17 00:00:00 2001
From: Mateusz Kusiak <mateusz.kusiak@intel.com>
Date: Thu, 18 Jan 2024 11:30:19 +0100
Subject: [PATCH 5/5] Add understanding output section in man
Git-commit: 37eeae381a8ed07a1fabb64184fe45d95a861496
Patch-mainline: mdadm-4.3+
References: jsc#PED-7542

Add new section in man for explaining mdadm outputs.
Describe checkpoint entry.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Coly Li <colyli@suse.de>
---
 mdadm.8.in | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/mdadm.8.in b/mdadm.8.in
index 96a4a08..9ba6682 100644
--- a/mdadm.8.in
+++ b/mdadm.8.in
@@ -3179,7 +3179,7 @@ environment.  This can be useful for testing or for disaster
 recovery.  You should be aware that interoperability may be
 compromised by setting this value.
 
-These change can also be suppressed by adding 
+These change can also be suppressed by adding
 .B mdadm.imsm.test=1
 to the kernel command line. This makes it easy to test IMSM
 code in a virtual machine that doesn't have IMSM virtual hardware.
@@ -3454,6 +3454,25 @@ is any string.  These names are supported by
 since version 3.3 provided they are enabled in
 .IR mdadm.conf .
 
+.SH UNDERSTANDING OUTPUT
+
+.TP
+EXAMINE
+
+.TP
+.B checkpoint
+Checkpoint value is reported when array is performing some action including
+resync, recovery or reshape. Checkpoints allow resuming action from certain
+point if it was interrupted.
+
+Checkpoint is reported as combination of two values: current migration unit
+and number of blocks per unit. By multiplying those values and dividing by
+array size checkpoint progress percentage can be obtained in relation to
+current progress reported in /proc/mdstat. Checkpoint is also related to (and
+sometimes based on) sysfs entry sync_completed but depending on action units
+may differ. Even if units are the same, it should not be expected that
+checkpoint and sync_completed will be exact match nor updated simultaneously.
+
 .SH NOTE
 .I mdadm
 was previously known as
-- 
2.35.3

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