Hi!
I'm having some problems with a raid 5 array and I'm not sure how to
diagnose the problem and how to proceed so I figured I need to ask the
experts :-)
I actually suspect I may have several problems at the same time.
The machine has two raid arrays, one raid 1 (md0) and one raid 5
(md1). The raid 5 array consists of 5 x 2TB WD RE4-GP drives.
I found some read errors in the log on /dev/sdh so I replaced it with
a new RE4 GP drive and did mdadm --add /dev/md1 /dev/sdh.
The array was rebuilding and I left it for the night.
In the morning cat /proc/mdstat showed that 2 drives where down. I may
remember incorrectly but I think that /dev/sdh showed up as a spare
and another drive showed fail but the array showed up as active.
Anyway, I'm not sure which drive showed fail but I disconnected the
system for more diagnosis. This was a couple of days ago.
I found that the CPU fan had stopped working and replaced it. The case
have several fans and the heatsink seemed cool even without the fan
(it's an i3-530 that does nothing more than samba so it's mostly
idle). Possibly the hardrives has been running hotter than normal for
a while though.
Anyway, now when I reboot I get this:
cat /proc/mdstat
Personalities : [raid1]
md1 : inactive sdd[1](S) sdh[5](S) sdg[4](S) sdf[2](S) sde[0](S)
9767572480 blocks
md0 : active raid1 sda[0] sdb[1]
1953514496 blocks [2/2] [UU]
unused devices: <none>
I'm not sure what is happening and what my next step is. I would
appreciate any help on this so I don't screw up the system more than
it already is :-)
Below is the ouput of "mdadm --examine" for the drives in the raid 5 array.
BTW, don't know if it matters but the system is running an older
debian (lenny?) with a 2.6.32 backport kernel, mdadm version is 2.6.7.2.
Best Regards,
Peter
mdadm --examine /dev/sd?
/dev/sdd:
Magic : a92b4efc
Version : 00.90.00
UUID : 61a6a879:adb7ac7b:86c7b55e:eb5cc2b6
Creation Time : Thu Jun 24 15:12:41 2010
Raid Level : raid5
Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB)
Array Size : 7814057984 (7452.07 GiB 8001.60 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 1
Update Time : Wed Oct 9 20:29:41 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Checksum : 3dc0af1a - correct
Events : 1288444
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 1 8 48 1 active sync /dev/sdd
0 0 0 0 0 removed
1 1 8 48 1 active sync /dev/sdd
2 2 8 80 2 active sync /dev/sdf
3 3 0 0 3 faulty removed
4 4 8 96 4 active sync /dev/sdg
5 5 8 112 5 spare /dev/sdh
/dev/sde:
Magic : a92b4efc
Version : 00.90.00
UUID : 61a6a879:adb7ac7b:86c7b55e:eb5cc2b6
Creation Time : Thu Jun 24 15:12:41 2010
Raid Level : raid5
Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB)
Array Size : 7814057984 (7452.07 GiB 8001.60 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 1
Update Time : Tue Oct 8 03:26:05 2013
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 1
Spare Devices : 1
Checksum : 3dbe6d93 - correct
Events : 1288428
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 0 8 64 0 active sync /dev/sde
0 0 8 64 0 active sync /dev/sde
1 1 8 48 1 active sync /dev/sdd
2 2 8 80 2 active sync /dev/sdf
3 3 0 0 3 faulty removed
4 4 8 96 4 active sync /dev/sdg
5 5 8 112 5 spare /dev/sdh
/dev/sdf:
Magic : a92b4efc
Version : 00.90.00
UUID : 61a6a879:adb7ac7b:86c7b55e:eb5cc2b6
Creation Time : Thu Jun 24 15:12:41 2010
Raid Level : raid5
Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB)
Array Size : 7814057984 (7452.07 GiB 8001.60 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 1
Update Time : Wed Oct 9 20:29:41 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Checksum : 3dc0af3c - correct
Events : 1288444
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 2 8 80 2 active sync /dev/sdf
0 0 0 0 0 removed
1 1 8 48 1 active sync /dev/sdd
2 2 8 80 2 active sync /dev/sdf
3 3 0 0 3 faulty removed
4 4 8 96 4 active sync /dev/sdg
5 5 8 112 5 spare /dev/sdh
/dev/sdg:
Magic : a92b4efc
Version : 00.90.00
UUID : 61a6a879:adb7ac7b:86c7b55e:eb5cc2b6
Creation Time : Thu Jun 24 15:12:41 2010
Raid Level : raid5
Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB)
Array Size : 7814057984 (7452.07 GiB 8001.60 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 1
Update Time : Wed Oct 9 20:29:41 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Checksum : 3dc0af50 - correct
Events : 1288444
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 4 8 96 4 active sync /dev/sdg
0 0 0 0 0 removed
1 1 8 48 1 active sync /dev/sdd
2 2 8 80 2 active sync /dev/sdf
3 3 0 0 3 faulty removed
4 4 8 96 4 active sync /dev/sdg
5 5 8 112 5 spare /dev/sdh
/dev/sdh:
Magic : a92b4efc
Version : 00.90.00
UUID : 61a6a879:adb7ac7b:86c7b55e:eb5cc2b6
Creation Time : Thu Jun 24 15:12:41 2010
Raid Level : raid5
Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB)
Array Size : 7814057984 (7452.07 GiB 8001.60 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 1
Update Time : Wed Oct 9 20:29:41 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Checksum : 3dc0af5c - correct
Events : 1288444
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
this 5 8 112 5 spare /dev/sdh
0 0 0 0 0 removed
1 1 8 48 1 active sync /dev/sdd
2 2 8 80 2 active sync /dev/sdf
3 3 0 0 3 faulty removed
4 4 8 96 4 active sync /dev/sdg
5 5 8 112 5 spare /dev/sdh
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