Francois,
Thank you for the very swift response.
> First, what is your mdadm version ?
# mdadm --version
mdadm - v1.12.0 - 14 June 2005
>
> Then, could you please show us the result of :
>
> mdadm -E /dev/sd[abcd]1
# mdadm -E /dev/sd[abcd]1
/dev/sda1:
Magic : a92b4efc
Version : 00.90.03
UUID : 8a66d568:0be5b0a0:93b729eb:6f23c014
Creation Time : Tue Apr 25 16:17:14 2006
Raid Level : raid5
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Jun 29 09:10:39 2006
State : active
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : e2b8644f - correct
Events : 0.2701790
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 1 0 active sync /dev/sda1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
2 2 8 33 2 active sync /dev/sdc1
3 3 8 49 3 active sync /dev/sdd1
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.03
UUID : 8a66d568:0be5b0a0:93b729eb:6f23c014
Creation Time : Tue Apr 25 16:17:14 2006
Raid Level : raid5
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Mon Jun 26 20:27:44 2006
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : e2db6503 - correct
Events : 0.2607131
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 8 1 0 active sync /dev/sda1
1 1 8 17 1 active sync /dev/sdb1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 49 3 active sync /dev/sdd1
/dev/sdc1:
Magic : a92b4efc
Version : 00.90.03
UUID : 8a66d568:0be5b0a0:93b729eb:6f23c014
Creation Time : Tue Apr 25 16:17:14 2006
Raid Level : raid5
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Jun 29 09:10:39 2006
State : active
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : e2b86473 - correct
Events : 0.2701790
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 33 2 active sync /dev/sdc1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
2 2 8 33 2 active sync /dev/sdc1
3 3 8 49 3 active sync /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 00.90.03
UUID : 8a66d568:0be5b0a0:93b729eb:6f23c014
Creation Time : Tue Apr 25 16:17:14 2006
Raid Level : raid5
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Jun 29 09:10:39 2006
State : active
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : e2b86485 - correct
Events : 0.2701790
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 49 3 active sync /dev/sdd1
0 0 8 1 0 active sync /dev/sda1
1 1 0 0 1 faulty removed
2 2 8 33 2 active sync /dev/sdc1
3 3 8 49 3 active sync /dev/sdd1
what I see is that /dev/sdb1 is signaled as faulty (though it was known to
be not fault before the power failure), and that the whole array is dirty
because of the power failure - thus it can't resync.
but even if I hot-add /dev/sdb1 after starting the array, it will say that
it's resyncing, but actually nothing will happen (no disk activity
according to vmstat, no CPU load, etc.)
Akos
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