Re: raid5: Disk failure on sdm, disabling device

On Wed, 2005-08-31 at 13:26, David M. Strang wrote:
> Okay, my array is degraded -- and the device /dev/sdm is disabled.
>
> Short of a reboot, is there a way to re-enable the device? It's already
> flagged as faulty in mdadm.

Have you tried to remove /dev/sdm from the RAID and add it back in? I
guess that the larger question is what caused it to be flagged faulty?

Forrest

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Re: raid5: Disk failure on sdm, disabling device

Aug 31 04:48:15 abyss kernel: md: excessive errors occurred during
superblock update, exiting
Aug 31 04:48:15 abyss kernel: scsi2 (12:0): rejecting I/O to offline device
Aug 31 04:48:15 abyss kernel: raid5: Disk failure on sdm, disabling device.
Operation continuing on 27 devices

However, in the past -- I had to rebuild the array; and now it looks like
this:

/dev/md0:
Version : 01.00.01
Creation Time : Wed Dec 31 19:00:00 1969
Raid Level : raid5
Array Size : 1935556992 (1845.89 GiB 1982.01 GB)
Device Size : 71687296 (68.37 GiB 73.41 GB)
Raid Devices : 28
Total Devices : 28
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Wed Aug 31 11:04:22 2005
State : clean, degraded
Active Devices : 27
Working Devices : 27
Failed Devices : 1
Spare Devices : 0

Layout : left-asymmetric
Chunk Size : 128K

UUID : 4e2b6b0a8e:92e91c0c:018a4bf0:9bb74d
Events : 333051

Number Major Minor RaidDevice State
0 8 0 0 active sync
/dev/scsi/host2/bus0/target0/lun0/disc
1 8 16 1 active sync
/dev/scsi/host2/bus0/target1/lun0/disc
2 8 32 2 active sync
/dev/scsi/host2/bus0/target2/lun0/disc
3 8 48 3 active sync
/dev/scsi/host2/bus0/target3/lun0/disc
4 8 64 4 active sync
/dev/scsi/host2/bus0/target4/lun0/disc
5 8 80 5 active sync
/dev/scsi/host2/bus0/target5/lun0/disc
6 8 96 6 active sync
/dev/scsi/host2/bus0/target6/lun0/disc
7 8 112 7 active sync
/dev/scsi/host2/bus0/target7/lun0/disc
8 8 128 8 active sync
/dev/scsi/host2/bus0/target8/lun0/disc
9 8 144 9 active sync
/dev/scsi/host2/bus0/target9/lun0/disc
10 8 160 10 active sync
/dev/scsi/host2/bus0/target10/lun0/disc
11 8 176 11 active sync
/dev/scsi/host2/bus0/target11/lun0/disc
12 8 192 - faulty
/dev/scsi/host2/bus0/target12/lun0/disc
13 8 208 13 active sync
/dev/scsi/host2/bus0/target13/lun0/disc
14 8 224 14 active sync
/dev/scsi/host2/bus0/target14/lun0/disc
15 8 240 15 active sync
/dev/scsi/host2/bus0/target15/lun0/disc
16 65 0 16 active sync
/dev/scsi/host2/bus0/target16/lun0/disc
17 65 16 17 active sync
/dev/scsi/host2/bus0/target17/lun0/disc
18 65 32 18 active sync
/dev/scsi/host2/bus0/target18/lun0/disc
19 65 48 19 active sync
/dev/scsi/host2/bus0/target19/lun0/disc
20 65 64 20 active sync
/dev/scsi/host2/bus0/target20/lun0/disc
21 65 80 21 active sync
/dev/scsi/host2/bus0/target21/lun0/disc
22 65 96 22 active sync
/dev/scsi/host2/bus0/target22/lun0/disc
23 65 112 23 active sync
/dev/scsi/host2/bus0/target23/lun0/disc
24 65 128 24 active sync
/dev/scsi/host2/bus0/target24/lun0/disc
25 65 144 25 active sync
/dev/scsi/host2/bus0/target25/lun0/disc
26 0 0 - removed
27 65 176 27 active sync
/dev/scsi/host2/bus0/target27/lun0/disc

28 65 160 26 active sync
/dev/scsi/host2/bus0/target26/lun0/disc


My last reboot -- which was due in part to a power failure; this device --
/dev/scsi/host2/bus0/target26/lun0/disc -- wouldn't join back into the raid
w/o being re-hotadded. With another device failed, I'm fearful of a reboot.
I want to attempt to rebuild the failed device; and see what happens.

-- David M. Strang



----- Original Message -----
From: Forrest Taylor
To: David M. Strang
Cc: Linux RAID
Sent: Wednesday, August 31, 2005 3:28 PM
Subject: Re: raid5: Disk failure on sdm, disabling device


On Wed, 2005-08-31 at 13:26, David M. Strang wrote:
> Okay, my array is degraded -- and the device /dev/sdm is disabled.
>
> Short of a reboot, is there a way to re-enable the device? It's already
> flagged as faulty in mdadm.

Have you tried to remove /dev/sdm from the RAID and add it back in? I
guess that the larger question is what caused it to be flagged faulty?

Forrest

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