Hi,
I have had a corruption of some sort on my raid5 setup,
and have not quite been able to solve it.
A previously failed disk partition is now a spare,
but I cannot get it made active again!
My array is /dev/md0
The components of this are /dev/sda5, sdb5, sdc5, sdd5
/dev/sdb5 was failed, and is now spare.
(NB: something got corrupted on that parition I think,
other partitions on that disk function ok)
Here is some output...
nas:~ # mdadm -E /dev/sdb5 (the "spare")
--------------------------
/dev/sdb5:
Magic : a92b4efc
Version : 00.90.03
UUID : b54e46e1:b6a6e6ea:3ae5a5a5:04e207e4
Creation Time : Fri Aug 4 22:42:14 2006
Raid Level : raid5
Used Dev Size : 244380672 (233.06 GiB 250.25 GB)
Array Size : 733142016 (699.18 GiB 750.74 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Wed Jun 18 20:58:38 2008
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Checksum : f11b2114 - correct
Events : 0.3796128
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 4 8 21 4 spare /dev/sdb5
0 0 8 5 0 active sync /dev/sda5
1 1 0 0 1 faulty removed
2 2 8 37 2 active sync /dev/sdc5
3 3 8 53 3 active sync /dev/sdd5
4 4 8 21 4 spare /dev/sdb5
nas:~ # mdadm -E /dev/sda5 (an "ok" partition)
--------------------------
/dev/sda5:
Magic : a92b4efc
Version : 00.90.03
UUID : b54e46e1:b6a6e6ea:3ae5a5a5:04e207e4
Creation Time : Fri Aug 4 22:42:14 2006
Raid Level : raid5
Used Dev Size : 244380672 (233.06 GiB 250.25 GB)
Array Size : 733142016 (699.18 GiB 750.74 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 0
Update Time : Thu Jun 19 09:51:45 2008
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Checksum : f11bd635 - correct
Events : 0.3796148
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 5 0 active sync /dev/sda5
0 0 8 5 0 active sync /dev/sda5
1 1 0 0 1 faulty removed
2 2 8 37 2 active sync /dev/sdc5
3 3 8 53 3 active sync /dev/sdd5
------------------------------
nas:~ # mdadm -A /dev/md0 -U summaries /dev/sda5 /dev/sdb5 /dev/sdc5 /dev/sdd5
mdadm: /dev/md0 has been started with 3 drives (out of 4) and 1 spare.
------------------------------
nas:~ # mdadm --grow --raid-devices=4 /dev/md0
mdadm: /dev/md0: Cannot reshape array without increasing size (yet).
------------------------------
I have also done
mdadm /dev/md0 -a /dev/sdb5
and this results in a recovery...
nas:~ # cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdb5[4] sda5[0] sdd5[3] sdc5[2]
733142016 blocks level 5, 64k chunk, algorithm 2 [4/3] [U_UU]
[=>...................] recovery = 7.3% (17900780/244380672) finish=174.1min speed=21666K/sec
unused devices: <none>
Which I've been through before, but still ends up as a spare.
Any ideas?
Thanks!!
Jon B
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