Hi,
I was trying to figure out how to add a hot spare to a 3 drive raid5
array and came across the following in the mdadm man page:
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 mul
tiple 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.
I presume the "/a" in the mdadm command should be "-a"? Would it be
possible to add a few more words to be more explicit about adding hot
spares to an existing active array? For example, it would be more
comforting to know that "mdadm /dev/md0 -a /dev/sdd1" to a fully
operational array (no failed devices) generates a hot spare for /dev/md0
but does not increase the capacity of /dev/md0.
While I have your attention, does adding the hot spare need to be
repeated after a reboot? Would I need to add the command to my rc.local
file?
Thanks!
Stephen
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