Hi,
I had a situation where after rebooting all three drives of a RAID5
array were marked as spares. I rebuild the array using "mdadm -C
/dev/md1 -e 1.1 --level 5 -n 3 --chunk 512 --assume-clean /dev/sda2
/dev/sdb2 /dev/sdc2" and mdstat showed it was again assembled. The
filesystem types on /dev/sdb were all "Linux" instead of "Linux raid
autodetect", so I changed them back.
/dev/md2 also has a problem, and I have no idea what to do there either.
When I tried to fsck it to be sure it was intact, it prompted me that
there was a problem with the superblock, and I answered Yes to "Fix?".
After there being a number of further errors, I quit fsck, and am here for help.
Did I perhaps assemble the array in the wrong disk order? Is there
another superblock that may be useful here and how would I find it?
I'm really concerned that I've lost the data and really hope someone
has some ideas.
# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid5 sda2[0] sdc2[2] sdb2[1]
51196928 blocks super 1.1 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
md2 : active raid5 sdc3[0] sdb3[2] sda3[1]
1890300928 blocks super 1.1 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
md0 : active raid1 sdc1[0] sdb1[1]
255988 blocks super 1.0 [3/2] [U_U]
unused devices: <none>
# mdadm -E /dev/md1
mdadm: No md superblock detected on /dev/md1.
# mdadm --detail /dev/md1
/dev/md1:
Version : 1.1
Creation Time : Fri Jul 6 13:41:54 2012
Raid Level : raid5
Array Size : 51196928 (48.83 GiB 52.43 GB)
Used Dev Size : 25598464 (24.41 GiB 26.21 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Fri Jul 6 16:01:18 2012
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : sysresccd:1 (local to host sysresccd)
UUID : 4ce6925e:b6cbd20e:7f3efbfc:668295fe
Events : 2
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
2 8 34 2 active sync /dev/sdc2
Thanks for any ideas,
Alex
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