Hi, I'm trying to recover a Western Digital Share Space NAS.
I'm able to assemble the RAID5 and restore the LVM but it can't see
any filesystem.
Below is a raid.log file that shows how the raid was configured when
it was working.
And also the output of mdadm -D showing the raid in it's current state.
Note the Version difference 00.90.01 vs. 0.90. And the array size
difference 2925293760 vs. 2925894144
I'm thinking this difference may be the reason Linux can not see a filesystem.
My question is would the version difference explain the array size difference?
And is it possible to create a version 00.90.01 array? I do not see
that in the mdadm docs.
....original working raid config....
/dev/md2:
Version : 00.90.01
Creation Time : Wed Jun 24 19:00:59 2009
Raid Level : raid5
Array Size : 2925293760 (2789.78 GiB 2995.50 GB)
Device Size : 975097920 (929.93 GiB 998.50 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Thu Jun 25 02:36:31 2009
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 6860a291:a5479bc6:e782da22:90dbd792
Events : 0.45705
Number Major Minor RaidDevice State
0 8 4 0 active sync /dev/sda4
1 8 20 1 active sync /dev/sdb4
2 8 36 2 active sync /dev/sdc4
3 8 52 3 active sync /dev/sdd4
....and here is the raid as it stands now. Note the end user I'm
helping tried to rebuild back on Sunday...
% mdadm -D /dev/md2
/dev/md2:
Version : 0.90
Creation Time : Sun Nov 18 12:07:53 2012
Raid Level : raid5
Array Size : 2925894144 (2790.35 GiB 2996.12 GB)
Used Dev Size : 975298048 (930.12 GiB 998.71 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Tue Nov 20 16:06:10 2012
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 2ac5bacd:b40dc3f5:cb031839:58437670
Events : 0.1
Number Major Minor RaidDevice State
0 253 19 0 active sync /dev/dm-19 <<<
Note I am using cow devices via dmsetup
1 253 11 1 active sync /dev/dm-11
2 253 15 2 active sync /dev/dm-15
3 253 7 3 active sync /dev/dm-7
Thank you for any and all help.
Regards,
Stephen
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