Greetings,
I hope that I'm posting this in the right place, if not my apologies.
Up until several hours ago, my system was running Ubuntu 10.04 LTS, using the
stock version of mdadm--unfortunately I have no idea which version it was.
Fast forward to now, I've upgraded the system to 12.04 LTS and have lost access
to my array. The array itself is a nine (9) disk raid6 managed by mdadm.
I'm not sure this is pertinent information, but trying to get 12.04 LTS to boot
was an exercise in patience. There was some sort of race condition possibly
happening between the disks of the array initializing and 12.04's udev. It would
constantly drop me to a busybox shell, trying to degrade the known-working
array.
Eventually, I had to go into /usr/share/initramfs-tools/scripts/mdadm-functions
and type "exit 1" into both degraded_arrays() and mountroot_fail() so that my
system could at the very least boot. I fear that the constant rebooting and
12.04's aggressive initramfs scripting has somehow damaged my array.
Ok back to the array itself, here's some raw command data:
# mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
/dev/sdg1 /dev/sdh1 /dev/sdi1 /dev/sdj1
mdadm: superblock on /dev/sdc1 doesn't match others - assembly aborted
I also tried # mdadm --auto-detect and found this in dmesg:
[ 676.998212] md: Autodetecting RAID arrays.
[ 676.998426] md: invalid raid superblock magic on sdc1
[ 676.998458] md: sdc1 does not have a valid v0.90 superblock, not importing!
[ 676.998870] md: invalid raid superblock magic on sde1
[ 676.998911] md: sde1 does not have a valid v0.90 superblock, not importing!
[ 676.999474] md: invalid raid superblock magic on sdb1
[ 676.999495] md: sdb1 does not have a valid v0.90 superblock, not importing!
[ 676.999703] md: invalid raid superblock magic on sdd1
[ 676.999732] md: sdd1 does not have a valid v0.90 superblock, not importing!
[ 677.000137] md: invalid raid superblock magic on sdf1
[ 677.000163] md: sdf1 does not have a valid v0.90 superblock, not importing!
[ 677.000566] md: invalid raid superblock magic on sdg1
[ 677.000586] md: sdg1 does not have a valid v0.90 superblock, not importing!
[ 677.000940] md: invalid raid superblock magic on sdh1
[ 677.000960] md: sdh1 does not have a valid v0.90 superblock, not importing!
[ 677.001356] md: invalid raid superblock magic on sdi1
[ 677.001375] md: sdi1 does not have a valid v0.90 superblock, not importing!
[ 677.001841] md: invalid raid superblock magic on sdj1
[ 677.001871] md: sdj1 does not have a valid v0.90 superblock, not importing!
[ 677.001933] md: Scanned 9 and added 0 devices.
[ 677.001938] md: autorun ...
[ 677.001941] md: ... autorun DONE.
Here are the disks themselves:
# mdadm -E /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Array Size : 27349181440 (13041.11 GiB 14002.78 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : a6fd99b2:7bb75287:5d844ec5:822b6d8a
Update Time : Sun Sep 30 04:34:27 2012
Checksum : 760485cb - correct
Events : 2474296
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 5
Array State : AAAAAAAAA ('A' == active, '.' == missing)
# mdadm -E /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : -unknown-
Raid Devices : 0
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : active
Device UUID : f3f72549:8543972f:1f4a655d:fa9416bd
Update Time : Sun Sep 30 07:26:43 2012
Checksum : 7e955e4e - correct
Events : 1
Device Role : spare
Array State : ('A' == active, '.' == missing)
# mdadm -E /dev/sdd1
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : -unknown-
Raid Devices : 0
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : active
Device UUID : 9c908e4b:ad7d8af8:ff5d2ab6:50b013e5
Update Time : Sun Sep 30 07:26:43 2012
Checksum : cab36055 - correct
Events : 1
Device Role : spare
Array State : ('A' == active, '.' == missing)
# mdadm -E /dev/sde1
/dev/sde1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : -unknown-
Raid Devices : 0
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : active
Device UUID : 321368f6:9f38bc16:76f787c3:4b3d398d
Update Time : Sun Sep 30 07:26:43 2012
Checksum : 4941c455 - correct
Events : 1
Device Role : spare
Array State : ('A' == active, '.' == missing)
# mdadm -E /dev/sdf1
/dev/sdf1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : -unknown-
Raid Devices : 0
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : active
Device UUID : 6190765b:200ff748:d50a75e3:597405c4
Update Time : Sun Sep 30 07:26:43 2012
Checksum : 37446270 - correct
Events : 1
Device Role : spare
Array State : ('A' == active, '.' == missing)
# mdadm -E /dev/sdg1
/dev/sdg1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : -unknown-
Raid Devices : 0
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : active
Device UUID : 7d707598:a8881376:531ae0c6:aac82909
Update Time : Sun Sep 30 07:26:43 2012
Checksum : c9ef1fe9 - correct
Events : 1
Device Role : spare
Array State : ('A' == active, '.' == missing)
# mdadm -E /dev/sdh1
/dev/sdh1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : -unknown-
Raid Devices : 0
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : active
Device UUID : 179691a0:fd201c2d:49c73803:409a0a9c
Update Time : Sun Sep 30 07:26:43 2012
Checksum : 584d5c61 - correct
Events : 1
Device Role : spare
Array State : ('A' == active, '.' == missing)
# mdadm -E /dev/sdi1
/dev/sdi1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Array Size : 27349181440 (13041.11 GiB 14002.78 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 9d53248b:1db27ffc:a2a511c3:7176a7eb
Update Time : Sun Sep 30 04:34:27 2012
Checksum : 22b9429c - correct
Events : 2474296
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 8
Array State : AAAAAAAAA ('A' == active, '.' == missing)
# mdadm -E /dev/sdj1
/dev/sdj1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 321fc20c:997e9a1a:bb67ffde:9de489f5
Name : ruby:6 (local to host ruby)
Creation Time : Mon Apr 11 19:40:25 2011
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 3907026672 (1863.02 GiB 2000.40 GB)
Array Size : 27349181440 (13041.11 GiB 14002.78 GB)
Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 880ed7fb:b9c673de:929d14c5:53f9b81d
Update Time : Sun Sep 30 04:34:27 2012
Checksum : a9748cf3 - correct
Events : 2474296
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 7
Array State : AAAAAAAAA ('A' == active, '.' == missing)
I find it odd that the raid levels for some of the disks would register as
"unknown" and that their device roles would be shifted to "spare".
Current system:
Linux ruby 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64
x86_64 x86_64 GNU/Linux
Mdadm version:
mdadm - v3.2.3 - 23rd December 2011
I hope I've provided enough information. I would be more than happy to elaborate
or provide additional data if need be. Again, this array was functioning
normally up until a few hours ago. Am I able to salvage my data?
Thank you.
-EJ
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