Hello,
while doing a md-check, there was a problem with Lustre and I had to
hard-reboot. Please note, the raid was perfectly fine, I only did a
manual "echo check >/sys/block/md3/md/sync_action" to increase the load.
After the unclean reset/reboot the md devices don't come up, dmesg shows:
[ 1169.127975] md: pers->run() failed ...
[ 1193.398304] md: md3 stopped.
[ 1193.401312] md: unbind<sdk1>
[ 1193.404287] md: export_rdev(sdk1)
[ 1193.407759] md: unbind<sdm1>
[ 1193.410751] md: export_rdev(sdm1)
[ 1193.414162] md: unbind<sdg1>
[ 1193.417162] md: export_rdev(sdg1)
[ 1193.420585] md: unbind<sdc1>
[ 1193.423564] md: export_rdev(sdc1)
[ 1275.761216] md: md3 stopped.
[ 1275.768875] md: bind<sdc1>
[ 1275.771869] md: bind<sdg1>
[ 1275.775006] md: bind<sdm1>
[ 1275.778210] md: bind<sdk1>
[ 1275.781219] md: md3: raid array is not clean -- starting background
reconstruction
[ 1275.792922] raid5: md3: unsupported reshape (reduce disks) required -
aborting.
mdadm --force --run doesn't help. It also doesn't help to just specifiy 4 of
the 6 md devices. The super-block is on all device identical as shown below.
As last action I think I can only recreate the array, but I think this is the
worst and most dangerous action and IMHO this is a bug.
Any idea how to continue without re-creating the array?
This is with linux-2.6.22.18 and mdadm v2.5.6 .
pfs1n9:~# mdadm --examine /dev/inf/box-6a/1
/dev/inf/box-6a/1:
Magic : a92b4efc
Version : 00.91.00
UUID : c318c4c3:7c976bfe:da28f9bd:db4d93a0
Creation Time : Wed Jan 2 18:09:05 2008
Raid Level : raid6
Device Size : 1708717056 (1629.56 GiB 1749.73 GB)
Array Size : 6834868224 (6518.24 GiB 6998.91 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Reshape pos'n : 225878016 (215.41 GiB 231.30 GB)
Update Time : Tue Feb 26 19:40:04 2008
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Checksum : ae7a4ac1 - correct
Events : 0.123769
Chunk Size : 1024K
Number Major Minor RaidDevice State
this 4 8 65 4 active sync /dev/sde1
0 0 8 161 0 active sync /dev/sdk1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 97 2 active sync /dev/sdg1
3 3 8 193 3 active sync /dev/sdm1
4 4 8 65 4 active sync /dev/sde1
5 5 8 129 5 active sync /dev/sdi1
pfs1n9:~#
Thanks in advance,
Bernd
--
Bernd Schubert
Q-Leap Networks GmbH
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