Hello all,
I have a RAID 5 array that was created on Fedora 9 that just holds user
files (Samba share). Everything was fine until a kernel upgrade and
motherboard failure made it impossible for me to boot. After a new
motherboard and an upgrade to Fedora 12, my array is toast.
The problems are my own. I was not paying enough attention to the data
and more on the OS. So what happened was what was originally a 5 disk
RAID 5 array was somehow detected as a RAID 5 array with 4 disks + 1
spare. It mounted and started a rebuild. It was somewhere around 40%
before I noticed it.
So my question is, can I get this data back or is it gone?
If I try to mount it now, with the correct configuration I get the
following error:
mdadm --create /dev/md0 --level=5 --spare-devices=0 --raid-devices=5
/dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdf1[5] sde1[3] sdd1[2] sdc1[1] sdb1[0]
2930287616 blocks level 5, 64k chunk, algorithm 2 [5/4] [UUUU_]
[>....................] recovery = 0.1% (1255864/732571904)
finish=155.2min speed=78491K/sec
unused devices: <none>
mount -t ext4 -o usrquota,grpquota,acl,user_xattr /dev/md0 /home/data
mdadm -E /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : 18928390:76024ba7:d9fdb3bf:6408b6d2 (local to host server)
Creation Time : Mon Jan 25 16:14:08 2010
Raid Level : raid5
Used Dev Size : 732571904 (698.64 GiB 750.15 GB)
Array Size : 2930287616 (2794.54 GiB 3000.61 GB)
Raid Devices : 5
Total Devices : 6
Preferred Minor : 0
Update Time : Mon Jan 25 16:14:08 2010
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 1
Spare Devices : 1
Checksum : 382dc6ea - correct
Events : 1
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 17 0 active sync /dev/sdb1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 49 2 active sync /dev/sdd1
3 3 8 65 3 active sync /dev/sde1
4 0 0 0 0 spare
5 5 8 81 5 spare /dev/sdf1
Here is what is in /var/log/messages
Jan 25 16:14:08 server kernel: md: bind<sdb1>
Jan 25 16:14:08 server kernel: md: bind<sdc1>
Jan 25 16:14:08 server kernel: md: bind<sdd1>
Jan 25 16:14:08 server kernel: md: bind<sde1>
Jan 25 16:14:08 server kernel: md: bind<sdf1>
Jan 25 16:14:09 server kernel: raid5: device sde1 operational as raid disk 3
Jan 25 16:14:09 server kernel: raid5: device sdd1 operational as raid disk 2
Jan 25 16:14:09 server kernel: raid5: device sdc1 operational as raid disk 1
Jan 25 16:14:09 server kernel: raid5: device sdb1 operational as raid disk 0
Jan 25 16:14:09 server kernel: raid5: allocated 5332kB for md0
Jan 25 16:14:09 server kernel: raid5: raid level 5 set md0 active with 4
out of 5 devices, algorithm 2
Jan 25 16:14:09 server kernel: RAID5 conf printout:
Jan 25 16:14:09 server kernel: --- rd:5 wd:4
Jan 25 16:14:09 server kernel: disk 0, o:1, dev:sdb1
Jan 25 16:14:09 server kernel: disk 1, o:1, dev:sdc1
Jan 25 16:14:09 server kernel: disk 2, o:1, dev:sdd1
Jan 25 16:14:09 server kernel: disk 3, o:1, dev:sde1
Jan 25 16:14:09 server kernel: md0: detected capacity change from 0 to
3000614518784
Jan 25 16:14:09 server kernel: md0: unknown partition table
Jan 25 16:14:09 server kernel: RAID5 conf printout:
Jan 25 16:14:09 server kernel: --- rd:5 wd:4
Jan 25 16:14:09 server kernel: disk 0, o:1, dev:sdb1
Jan 25 16:14:09 server kernel: disk 1, o:1, dev:sdc1
Jan 25 16:14:09 server kernel: disk 2, o:1, dev:sdd1
Jan 25 16:14:09 server kernel: disk 3, o:1, dev:sde1
Jan 25 16:14:09 server kernel: disk 4, o:1, dev:sdf1
Jan 25 16:14:09 server kernel: md: recovery of RAID array md0
Jan 25 16:14:09 server kernel: md: minimum _guaranteed_ speed: 1000
KB/sec/disk.
Jan 25 16:14:09 server kernel: md: using maximum available idle IO
bandwidth (but not more than 200000 KB/sec) for recovery.
Jan 25 16:14:09 server kernel: md: using 128k window, over a total of
732571904 blocks.
Jan 25 16:15:12 server kernel: EXT4-fs (md0): VFS: Can't find ext4 filesystem
Thank you in advance.
---
Will Y.
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