Hi all,
I was discussing this with linux-raid and they suggested trying linux-xfs now. Here is the story... I converted my RAID5 from 8 disks to 6 disks using "mdadm --grow /dev/md0 --array-size" and then "mdadm --grow /dev/md0 --raid-devices=6" and after rebooting, it won't mount. It has been running fine for about a year. File system is XFS. I didn't know you had to resize the xfs partition before resizing the raid array so now I'm stuck trying to repair XFS after truncating the array.
I tried running xfs_repair and it will just run forever and says "............................found candidate secondary superblock...
error reading superblock 80 -- seek to offset 7501512704000 failed
unable to verify superblock, continuing...
..........................................................................................................................................".
I'm trying to recover whatever data I can, if any.
Here is some info on it....
mtehonica@ghostrider:~$ sudo mdadm -D /dev/md0
/dev/md0:
Version : 1.01
Creation Time : Mon Dec 21 19:40:58 2009
Raid Level : raid5
Array Size : 7325690880 (6986.32 GiB 7501.51 GB)
Used Dev Size : 1465138176 (1397.26 GiB 1500.30 GB)
Raid Devices : 6
Total Devices : 8
Persistence : Superblock is persistent
Update Time : Wed Feb 16 19:13:50 2011
State : clean
Active Devices : 6
Working Devices : 8
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 512K
Name : ghostrider:0 (local to host ghostrider)
UUID : b4ba7316:08976ceb:3ab7af7b:430ff147
Events : 327264
Number Major Minor RaidDevice State
0 8 80 0 active sync /dev/sdf
1 8 16 1 active sync /dev/sdb
3 8 64 2 active sync /dev/sde
4 8 48 3 active sync /dev/sdd
5 8 0 4 active sync /dev/sda
8 8 112 5 active sync /dev/sdh
6 8 144 - spare /dev/sdj
7 8 128 - spare /dev/sdi
mtehonica@ghostrider:~$ sudo mdadm -E /dev/sda
/dev/sda:
Magic : a92b4efc
Version : 1.1
Feature Map : 0x0
Array UUID : b4ba7316:08976ceb:3ab7af7b:430ff147
Name : ghostrider:0 (local to host ghostrider)
Creation Time : Mon Dec 21 19:40:58 2009
Raid Level : raid5
Raid Devices : 6
Avail Dev Size : 2930276904 (1397.26 GiB 1500.30 GB)
Array Size : 14651381760 (6986.32 GiB 7501.51 GB)
Used Dev Size : 2930276352 (1397.26 GiB 1500.30 GB)
Data Offset : 264 sectors
Super Offset : 0 sectors
State : clean
Device UUID : 83ff92c5:b7acdfcd:d3ace2b5:0ac3549a
Update Time : Wed Feb 16 19:13:52 2011
Checksum : 5053499e - correct
Events : 327264
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 4
Array State : AAAAAA ('A' == active, '.' == missing)
mtehonica@ghostrider:~$ sudo mount /dev/md0 /test
mount: /dev/md0: can't read superblock
Thanks in advance!
Matt
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