----- Message from neilb@xxxxxxx ---------
Date: Tue, 16 Oct 2007 11:16:19 +1000
From: Neil Brown <neilb@xxxxxxx>
Reply-To: Neil Brown <neilb@xxxxxxx>
Subject: Re: Help RAID5 reshape Oops / backup-file
To: Nagilum <nagilum@xxxxxxxxxxx>
Cc: linux-raid@xxxxxxxxxxxxxxx
Thanks for the extra details. I still cannot manage to reproduce it which is frustrating, but I think I can fix your array for you. Get the source for mdadm 2.6.3, apply the following patch, then use mdadm -A /dev/md0 --update=this /dev/sd[abcde] that should re-write the part of the superblocks that is wrong, then assemble the array. Please let me know how it goes. Also, if you could show me "mdadm.conf" and "mdrun.conf" from the initrd, that might help. Thanks, NeilBrown
----- End message from neilb@xxxxxxx -----
Thanks a bunch mate!
So far it looks very well:
nas:~/mdadm-2.6.3# ./mdadm -Q --detail /dev/md0
/dev/md0:
Version : 00.91.03
Creation Time : Sat Sep 15 21:11:41 2007
Raid Level : raid5
Used Dev Size : 488308672 (465.69 GiB 500.03 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Oct 8 23:59:27 2007
State : active, degraded, Not Started
Active Devices : 3
Working Devices : 5
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 16K
Delta Devices : 2, (3->5)
UUID : 25da80a6:d56eb9d6:0d7656f3:2f233380
Events : 0.470134
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 8 32 2 active sync /dev/sdc
3 0 0 3 removed
4 0 0 4 removed
5 8 48 - spare /dev/sdd
6 8 64 - spare /dev/sde
nas:~/mdadm-2.6.3# mdadm -S /dev/md0
mdadm: stopped /dev/md0
nas:~/mdadm-2.6.3# ./mdadm -A /dev/md0 --update=this /dev/sd[abcde]
mdadm: Setting this disk from 5 to 4
mdadm: Setting this disk from 6 to 3
mdadm: /dev/md0 assembled from 3 drives and 2 spares - not enough to
start the array.
nas:~/mdadm-2.6.3# mdadm -S /dev/md0
mdadm: stopped /dev/md0
nas:~/mdadm-2.6.3# ./mdadm -A /dev/md0 /dev/sd[abcde]
mdadm: /dev/md0 has been started with 5 drives.
nas:~/mdadm-2.6.3# ./mdadm -Q --detail /dev/md0
/dev/md0:
Version : 00.91.03
Creation Time : Sat Sep 15 21:11:41 2007
Raid Level : raid5
Array Size : 976617344 (931.37 GiB 1000.06 GB)
Used Dev Size : 488308672 (465.69 GiB 500.03 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Tue Oct 16 13:42:03 2007
State : clean, recovering
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 16K
Reshape Status : 44% complete
Delta Devices : 2, (3->5)
UUID : 25da80a6:d56eb9d6:0d7656f3:2f233380
Events : 0.470212
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 8 32 2 active sync /dev/sdc
3 8 64 3 active sync /dev/sde
4 8 48 4 active sync /dev/sdd
nas:~# cat /proc/mdstat
md0 : active raid5 sda[0] sdd[4] sde[3] sdc[2] sdb[1]
976617344 blocks super 0.91 level 5, 16k chunk, algorithm 2
[5/5] [UUUUU]
[=============>.......] reshape = 67.5% (329927392/488308672)
finish=48.6min speed=54235K/sec
unused devices: <none>I'll send an update (including the configs) when its done and I've verified everything is healthy. (and my heart has stopped racing ;) At first I was bit scared because of the order (sde before sdd) but that's consistent with the mdadm -E output from the devices earlier, so it looks like I'll soon have my data back. *yay* :)
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