Hello all,
I have another seminewbie question. I had an issue, likely hardware
related, which forced me to reboot a machine with a RAID6 during a
rebuild after a previous drive failure. Now, after some other hardware
issues, I've been able to successfully assemble the array, but it
seems to be in an odd state:
# mdadm -D /dev/md0
/dev/md0:
Version : 1.01
Creation Time : Thu Sep 29 21:26:35 2011
Raid Level : raid6
Array Size : 13671797440 (13038.44 GiB 13999.92 GB)
Used Dev Size : 1953113920 (1862.63 GiB 1999.99 GB)
Raid Devices : 9
Total Devices : 11
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Dec 15 12:19:41 2011
State : clean, degraded
Active Devices : 8
Working Devices : 11
Failed Devices : 0
Spare Devices : 3
Chunk Size : 64K
Name : 0
UUID : 24363b01:90deb9b5:4b51e5df:68b8b6ea
Events : 102730
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
6 8 113 1 active sync /dev/sdh1
11 8 177 2 spare rebuilding /dev/sdl1
3 8 65 3 active sync /dev/sde1
4 8 81 4 active sync /dev/sdf1
9 8 145 5 active sync /dev/sdj1
10 8 97 6 active sync /dev/sdg1
7 8 129 7 active sync /dev/sdi1
8 8 161 8 active sync /dev/sdk1
12 8 225 - spare /dev/sdo1
13 8 49 - spare /dev/sdd1
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdd1[13](S) sdb1[0] sdo1[12](S) sdk1[8] sdi1[7]
sdg1[10] sdj1[9] sdf1[4] sde1[3] sdl1[11] sdh1[6]
13671797440 blocks super 1.1 level 6, 64k chunk, algorithm 2 [9/8]
[UU_UUUUUU]
unused devices: <none>
I'm interpreting this as that a member is missing, but for some reason
the rebuild on sdl1 has not restarted. What would be the next logical
step to take? I've found some posts which imply that setting sync_action
to repair will work, but I'm a little wary of doing that without knowing
how risky that is. Or, reading Documentation/md.txt, perhaps I should
set it to "recover"? Or "resync", since it's possible the array was not
shut down cleanly?
FWIW, I have started the array, activated the LVM volume, and am running
xfs_repair -n (which is not supposed to do any writes), but otherwise
haven't risked modifying the filesystem (e.g., by mounting it). So far
the xfs_repair seems fine, and has not reported any errors.
Thanks for your help (and patience).
--keith
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kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx
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