Hi,
I have some issues reviving my raid5 array after a power failure. I'm
running gentoo Linux 2.6.16, and I have a raid5 array /dev/md0 if 4 disks,
/dev/sd[a-d]1. On top of this, I have a crypto devmap with LUKS.
After the power failure, the array sort of starts up and doesn't at the
same time:
# cat /proc/mdstat
Personalities : [raid5] [raid4]
unused devices: <none>
# mdadm -A /dev/md0
mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
# cat /proc/mdstat
Personalities : [raid5] [raid4]
md0 : inactive sda1[0] sdd1[3] sdc1[2]
1172126208 blocks
unused devices: <none>
# mdadm --query /dev/md0
/dev/md0: 0.00KiB raid5 4 devices, 0 spares. Use mdadm --detail for more
detail./dev/md0: is too small to be an md component.
# mdadm --query --detail /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Tue Apr 25 16:17:14 2006
Raid Level : raid5
Device Size : 390708736 (372.61 GiB 400.09 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Jun 29 09:10:39 2006
State : active, degraded
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : 8a66d568:0be5b0a0:93b729eb:6f23c014
Events : 0.2701790
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 0 0 - removed
2 8 33 2 active sync /dev/sdc1
3 8 49 3 active sync /dev/sdd1
#
so it's sort of strange that on one hand (in /proc/mdstat) it's inactive,
but according to mdstat it's active? also, mdstat --query says it's
0.00KiB in size?
also, on the mdadm -A /dev/md0 call, the following is written to the syslog:
Jun 30 11:10:22 tower md: md0 stopped.
Jun 30 11:10:22 tower md: bind<sdc1>
Jun 30 11:10:22 tower md: bind<sdd1>
Jun 30 11:10:22 tower md: bind<sda1>
Jun 30 11:10:22 tower md: md0: raid array is not clean -- starting
background reconstruction
Jun 30 11:10:22 tower raid5: device sda1 operational as raid disk 0
Jun 30 11:10:22 tower raid5: device sdd1 operational as raid disk 3
Jun 30 11:10:22 tower raid5: device sdc1 operational as raid disk 2
Jun 30 11:10:22 tower raid5: cannot start dirty degraded array for md0
Jun 30 11:10:22 tower RAID5 conf printout:
Jun 30 11:10:22 tower --- rd:4 wd:3 fd:1
Jun 30 11:10:22 tower disk 0, o:1, dev:sda1
Jun 30 11:10:22 tower disk 2, o:1, dev:sdc1
Jun 30 11:10:22 tower disk 3, o:1, dev:sdd1
Jun 30 11:10:22 tower raid5: failed to run raid set md0
Jun 30 11:10:22 tower md: pers->run() failed ...
strange - why wouldn't it take all four disks (it's omitting /dev/sdb1)?
Though probably these are very lame questions, I'd still appreciate any
help...
Akos
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