Hello,
I've made a mess of my raid setup and am desperately trying to save
it. The setup is RAID-5 on 3 SATA disks. Problems started with one of
the disks getting unrecoverable read errors. Unfortunately I was away
on a trip and the machine was used by my family while this was going
on :(
Array consists of three devices: /dev/sda2, /dev/sdc2, and /dev/sdd2.
When I got back from the trip I found the following:
1. Two disks were removed from the array, leaving only /dev/sda2;
2. When either of the two was added, the array would start;
3. One combination of two disks (/dev/sda2 + /dev/sdd2) aproduced a
running /dev/md0 with a proper ext3 filesystem seen on the drive (even
passing fsck);
At this point I added /dev/sdc2 and the reconstruction started.
However did not complete, since /dev/sdd2 has unrecoverable errors.
Reading the list archives I figured I need another drive to ddrescue
/dev/sdd2, then perform the reconstruction.
However at some point during/after the reconstruction the situation
has changed. Now both /dev/sdc2 and /dev/sdd2 are marked as spare
drives (see mdadm -E output below) and I cannot start the array. I
think /dev/sdd2 should be in sync with /dev/sda2, but how can I bring
it back (it used to be device 2)?
/dev/sda2:
Magic : a92b4efc
Version : 0.90.01
UUID : bd5c2dc0:f76e5f10:a98c4de7:f2020715
Creation Time : Fri Jun 17 11:47:44 2005
Raid Level : raid5
Used Dev Size : 486375808 (463.84 GiB 498.05 GB)
Array Size : 972751616 (927.69 GiB 996.10 GB)
Raid Devices : 3
Total Devices : 1
Preferred Minor : 0
Update Time : Fri Feb 12 14:07:35 2010
State : active
Active Devices : 1
Working Devices : 1
Failed Devices : 2
Spare Devices : 0
Checksum : a4cd0c48 - correct
Events : 2125155
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 8 2 0 active sync /dev/sda2
0 0 8 2 0 active sync /dev/sda2
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
/dev/sdc2:
Magic : a92b4efc
Version : 0.90.01
UUID : bd5c2dc0:f76e5f10:a98c4de7:f2020715
Creation Time : Fri Jun 17 11:47:44 2005
Raid Level : raid5
Used Dev Size : 486375808 (463.84 GiB 498.05 GB)
Array Size : 972751616 (927.69 GiB 996.10 GB)
Raid Devices : 3
Total Devices : 1
Preferred Minor : 0
Update Time : Fri Feb 12 10:30:00 2010
State : active
Active Devices : 1
Working Devices : 1
Failed Devices : 2
Spare Devices : 0
Checksum : a4ccd973 - correct
Events : 2125153
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 4 8 2 -1 spare /dev/sdc2
0 0 8 34 0 active sync /dev/sda2
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
/dev/sdd2:
Magic : a92b4efc
Version : 0.90.01
UUID : bd5c2dc0:f76e5f10:a98c4de7:f2020715
Creation Time : Fri Jun 17 11:47:44 2005
Raid Level : raid5
Used Dev Size : 486375808 (463.84 GiB 498.05 GB)
Array Size : 972751616 (927.69 GiB 996.10 GB)
Raid Devices : 3
Total Devices : 2
Preferred Minor : 0
Update Time : Fri Feb 12 10:36:05 2010
State : active
Active Devices : 1
Working Devices : 2
Failed Devices : 2
Spare Devices : 1
Checksum : a4ccdb48 - correct
Events : 2125154
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 3 8 50 3 spare /dev/sdd2
0 0 8 34 0 active sync /dev/sda2
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 8 50 3 spare /dev/sdd2
--
Dmitry Teytelman
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