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57 lines
2.0 KiB
57 lines
2.0 KiB
2 months ago
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From 37eeae381a8ed07a1fabb64184fe45d95a861496 Mon Sep 17 00:00:00 2001
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From: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Date: Thu, 18 Jan 2024 11:30:19 +0100
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Subject: [PATCH 05/41] Add understanding output section in man
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Add new section in man for explaining mdadm outputs.
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Describe checkpoint entry.
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Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
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---
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mdadm.8.in | 21 ++++++++++++++++++++-
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1 file changed, 20 insertions(+), 1 deletion(-)
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diff --git a/mdadm.8.in b/mdadm.8.in
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index 96a4a08e..9ba66825 100644
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--- a/mdadm.8.in
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+++ b/mdadm.8.in
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@@ -3179,7 +3179,7 @@ environment. This can be useful for testing or for disaster
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recovery. You should be aware that interoperability may be
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compromised by setting this value.
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-These change can also be suppressed by adding
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+These change can also be suppressed by adding
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.B mdadm.imsm.test=1
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to the kernel command line. This makes it easy to test IMSM
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code in a virtual machine that doesn't have IMSM virtual hardware.
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@@ -3454,6 +3454,25 @@ is any string. These names are supported by
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since version 3.3 provided they are enabled in
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.IR mdadm.conf .
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+.SH UNDERSTANDING OUTPUT
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+
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+.TP
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+EXAMINE
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+
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+.TP
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+.B checkpoint
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+Checkpoint value is reported when array is performing some action including
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+resync, recovery or reshape. Checkpoints allow resuming action from certain
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+point if it was interrupted.
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+
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+Checkpoint is reported as combination of two values: current migration unit
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+and number of blocks per unit. By multiplying those values and dividing by
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+array size checkpoint progress percentage can be obtained in relation to
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+current progress reported in /proc/mdstat. Checkpoint is also related to (and
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+sometimes based on) sysfs entry sync_completed but depending on action units
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+may differ. Even if units are the same, it should not be expected that
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+checkpoint and sync_completed will be exact match nor updated simultaneously.
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+
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.SH NOTE
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.I mdadm
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was previously known as
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--
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2.40.1
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