i currently have four RAID-5 md arrays which i concatenated into one
logical volume (lvm2), essentially creating a RAID-50. each md array
was created with one spare disk.
instead, i would like to move the four spare disks into one group that
each of the four arrays can have access to when needed. i was wondering
how to safely accomplish this, preferably without unmounting/disrupting
the filesystem.
secondly, i have the checkarray script scheduled via cron to
periodically check each of the four arrays. i noticed in the output of
checkarray that it doesn't list the spare disk(s). so i'm guessing they
are not being checked? i was wondering, then, how i could also check
the spare disks to make sure they are healthy and ready to be used if
needed?
below is output of /proc/mdstat and mdadm.conf
thanks
--
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md3 : active (auto-read-only) raid5 sdal1[0] sdaw1[11](S) sdav1[10]
sdau1[9] sdat1[8] sdas1[7] sdar1[6] sdaq1[5] sdap1[4] sdao1[3] sdan1[2]
sdam1[1]
9766297600 blocks super 1.2 level 5, 512k chunk, algorithm 2
[11/11] [UUUUUUUUUUU]
bitmap: 0/8 pages [0KB], 65536KB chunk
md2 : active raid5 sdaa1[0] sdak1[11](S) sdz1[10] sdaj1[9] sdai1[8]
sdah1[7] sdag1[6] sdaf1[5] sdae1[4] sdad1[3] sdac1[2] sdab1[1]
9766297600 blocks super 1.2 level 5, 512k chunk, algorithm 2
[11/11] [UUUUUUUUUUU]
bitmap: 1/8 pages [4KB], 65536KB chunk
md1 : active raid5 sdn1[0] sdy1[11](S) sdx1[10] sdw1[9] sdv1[8] sdu1[7]
sdt1[6] sds1[5] sdr1[4] sdq1[3] sdp1[2] sdo1[1]
9766297600 blocks super 1.2 level 5, 512k chunk, algorithm 2
[11/11] [UUUUUUUUUUU]
bitmap: 1/8 pages [4KB], 65536KB chunk
md0 : active raid5 sdb1[0] sdm1[11](S) sdl1[10] sdk1[9] sdj1[8] sdi1[7]
sdh1[6] sdg1[5] sdf1[4] sde1[3] sdd1[2] sdc1[1]
9766297600 blocks super 1.2 level 5, 512k chunk, algorithm 2
[11/11] [UUUUUUUUUUU]
bitmap: 0/8 pages [0KB], 65536KB chunk
unused devices: <none>
# cat /etc/mdadm/mdadm.conf
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
MAILADDR root
ARRAY /dev/md/0 metadata=1.2 UUID=6dd6eba5:50fd8c6d:33ad61ee:e84763a8
name=hind:0
spares=1
ARRAY /dev/md/1 metadata=1.2 UUID=9336c73a:8b8993bf:ea6cfc3d:bf9f7441
name=hind:1
spares=1
ARRAY /dev/md/2 metadata=1.2 UUID=817bf91c:4f14fcb0:9ba8b112:768321ee
name=hind:2
spares=1
ARRAY /dev/md/3 metadata=1.2 UUID=1251c6b7:36aca0eb:b66b4c8c:830793ad
name=hind:3
spares=1
#
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