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mdadm: add man page for --add-journal 

Add the following to man page:

--add-journal
      Recreate journal for RAID-4/5/6 array that lost a journal device.
      In the current implementation, this command cannot add a journal
      to an array that had a failed journal. To avoid interrupting
      on-going write opertion --add-journal only works for array in
      Read-Only state.

Reported-by: Yi Zhang <yizhan@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
This commit is contained in:
Song Liu 2016-08-11 17:10:04 -07:00 committed by Jes Sorensen
parent ad7ac9ac66
commit ff3c881f84
1 changed files with 8 additions and 0 deletions
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@ -1444,6 +1444,14 @@ number. The receiving node must acknowledge this message
with \-\-cluster\-confirm. Valid arguments are <slot>:<devicename> in case with \-\-cluster\-confirm. Valid arguments are <slot>:<devicename> in case
the device is found or <slot>:missing in case the device is not found. the device is found or <slot>:missing in case the device is not found.
.TP
.BR \-\-add-journal
Recreate journal for RAID-4/5/6 array that lost a journal device. In the
current implementation, this command cannot add a journal to an array
that had a failed journal. To avoid interrupting on-going write opertions,
.B \-\-add-journal
only works for array in Read-Only state.
.P .P
Each of these options requires that the first device listed is the array Each of these options requires that the first device listed is the array
to be acted upon, and the remainder are component devices to be added, to be acted upon, and the remainder are component devices to be added,