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   mdadm    ( 8 )

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MANAGE MODE

Usage: mdadm device options... devices...

       This usage will allow individual devices in an array to be
       failed, removed or added.  It is possible to perform multiple
       operations with on command.  For example:
         mdadm /dev/md0 -f /dev/hda1 -r /dev/hda1 -a /dev/hda1
       will firstly mark /dev/hda1 as faulty in /dev/md0 and will then
       remove it from the array and finally add it back in as a spare.
       However only one md array can be affected by a single command.

       When a device is added to an active array, mdadm checks to see if
       it has metadata on it which suggests that it was recently a
       member of the array.  If it does, it tries to "re-add" the
       device.  If there have been no changes since the device was
       removed, or if the array has a write-intent bitmap which has
       recorded whatever changes there were, then the device will
       immediately become a full member of the array and those
       differences recorded in the bitmap will be resolved.