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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
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
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,