I have a Kubuntu Jaunty system with a custom 2.6.28 kernel. I recently
added a Sil3132/4726 based eSATA RAID box to use for backup. The box has
two drives set up as JBOD (pass-through) in the hardware. I broke each
disk into two partitions, and I used Linux software RAID to mirror the
partitions on the two disks, to create two RAID devices. This worked
fine for about a week.
At that point I tried to upgrade the kernel to 2.6.31_rc3. The upgrade
didn't work, due to problems with my graphics card, and I noticed that
when I booted into recovery mode to try to fix the problems, the log
showed lots of errors with the disks in the RAID box. I then went back
to the 2.6.28 kernel, and now the mirrored partitions on the disks in
the RAID box show they're in degraded mode, and I can't recover the
mirrors. See below for example, the symptoms for the second of the two
RAID devices are essentially the same.
If I hot-remove and hot-re-add the faulty spare the commands look like
they work, see below, but the array almost immediately goes back to the
degraded state with faulty spare. The re-add results in a ton of output
in /var/log/message, also see below, but I can't discern if this output
reflects a problem. I note that the faulty spare on the first of the two
RAID devices is on one of the disks (sdc), and the faulty spare on the
second of the two RAID devices is on the other of the disks (sdd).
How can I fix this?
# mdadm --detail /dev/md2
/dev/md2:
Version : 00.90
Creation Time : Fri Jul 24 13:27:32 2009
Raid Level : raid1
Array Size : 366281856 (349.31 GiB 375.07 GB)
Used Dev Size : 366281856 (349.31 GiB 375.07 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Mon Jul 27 11:43:56 2009
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
UUID : 75653f14:a5d9312e:8ccdfa7d:0ed26058 (local to host jboat17)
Events : 0.532
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 49 1 active sync /dev/sdd1
2 8 33 - faulty spare /dev/sdc1
------------------------------------------------
# mdadm --remove /dev/md2 /dev/sdc1
mdadm: hot removed /dev/sdc1
# mdadm --add /dev/md2 /dev/sdc1
mdadm: re-added /dev/sdc1
------------------------------------------------
#tail -f /var/log/messages
Jul 27 12:04:18 jboat17 kernel: [ 2981.219363] sd 6:0:0:0: [sdc] Add.
Sense: No additional sense information
Jul 27 12:04:18 jboat17 kernel: [ 2981.219407] sd 6:0:0:0: [sdc] Result:
hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Jul 27 12:04:18 jboat17 kernel: [ 2981.219413] sd 6:0:0:0: [sdc] Sense
Key : Hardware Error [current] [descriptor]
Jul 27 12:04:18 jboat17 kernel: [ 2981.219421] Descriptor sense data
with sense descriptors (in hex):
Jul 27 12:04:18 jboat17 kernel: [ 2981.219425] 72 04 00 00 00 00 00 0c
00 0a 80 00 00 00 36 e0
Jul 27 12:04:18 jboat17 kernel: [ 2981.219440] 00 00 00 00
Jul 27 12:04:18 jboat17 kernel: [ 2981.219446] sd 6:0:0:0: [sdc] Add.
Sense: No additional sense information
Jul 27 12:04:18 jboat17 kernel: [ 2981.219490] ata7: EH complete
Jul 27 12:04:18 jboat17 kernel: [ 2981.221837] sd 6:0:0:0: [sdc]
1465149168 512-byte hardware sectors: (750 GB/698 GiB)
Jul 27 12:04:18 jboat17 kernel: [ 2981.221872] sd 6:0:0:0: [sdc] Write
Protect is off
Jul 27 12:04:18 jboat17 kernel: [ 2981.221921] sd 6:0:0:0: [sdc] Write
cache: enabled, read cache: enabled, doesn't support DPO or FUA
Jul 27 12:04:18 jboat17 kernel: [ 2981.221971] sd 6:2:0:0: [sdd]
1465149168 512-byte hardware sectors: (750 GB/698 GiB)
Jul 27 12:04:18 jboat17 kernel: [ 2981.221995] sd 6:2:0:0: [sdd] Write
Protect is off
Jul 27 12:04:18 jboat17 kernel: [ 2981.222044] sd 6:2:0:0: [sdd] Write
cache: enabled, read cache: enabled, doesn't support DPO or FUA
Jul 27 12:04:18 jboat17 kernel: [ 2981.262163] md: md2: recovery done.
Jul 27 12:04:18 jboat17 kernel: [ 2981.279523] RAID1 conf printout:
Jul 27 12:04:18 jboat17 kernel: [ 2981.279531] --- wd:1 rd:2
Jul 27 12:04:18 jboat17 kernel: [ 2981.279536] disk 0, wo:1, o:0, dev:sdc1
Jul 27 12:04:18 jboat17 kernel: [ 2981.279541] disk 1, wo:0, o:1, dev:sdd1
Jul 27 12:04:18 jboat17 kernel: [ 2981.285536] RAID1 conf printout:
Jul 27 12:04:18 jboat17 kernel: [ 2981.285542] --- wd:1 rd:2
Jul 27 12:04:18 jboat17 kernel: [ 2981.285550] disk 1, wo:0, o:1, dev:sdd1
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