Hi Neil,
I ran mdadm --examine on the devices (as opposed to the partitions)
and was surprised:
Apparently the superblocks are present on some the devices, even if I
remember differently.
I attached the output of mdadm to this mail.
For the sake of clarity, this is how the raid looked like before it
all went wrong:
11 Drives (/dev/sd[abcdefghijk]) alltogether as a RAID 6.
2 of those are spares (/dev/sd[jk]).
1 is either close to failing of has failed (/dev/sdg).
I tried
mdadm --assemble --run /dev/md0 -v /dev/sd[abcdefghi]
which gave me
mdadm: looking for devices for /dev/md0
mdadm: no RAID superblock on /dev/sdg
mdadm: /dev/sdg has no superblock - assembly aborted
So it seems I somehow have to restore the superblocks on drives
/dev/sd[ghijk], or at least on /dev/sd[ghi].
Is this possible? Any help would be greatly appreciated!
Regards,
-P.
/dev/sda:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 2d18f556:0cbad263:017a87af:aadac8f7
Name : brain:0 (local to host brain)
Creation Time : Sun Mar 3 02:34:30 2013
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 20510947520 (19560.76 GiB 21003.21 GB)
Used Dev Size : 5860270720 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 205e9ef8:deb77ef0:c1616f65:488ee07b
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jun 9 21:52:48 2014
Checksum : 2b351b38 - correct
Events : 39295
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 0
Array State : AAAAAAAAA ('A' == active, '.' == missing)
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 2d18f556:0cbad263:017a87af:aadac8f7
Name : brain:0 (local to host brain)
Creation Time : Sun Mar 3 02:34:30 2013
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 20510947520 (19560.76 GiB 21003.21 GB)
Used Dev Size : 5860270720 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f8150037:720c981f:f6a476e2:b98fd23a
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jun 9 21:52:48 2014
Checksum : d4a96c49 - correct
Events : 39295
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 1
Array State : AAAAAAAAA ('A' == active, '.' == missing)
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 2d18f556:0cbad263:017a87af:aadac8f7
Name : brain:0 (local to host brain)
Creation Time : Sun Mar 3 02:34:30 2013
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 20510947520 (19560.76 GiB 21003.21 GB)
Used Dev Size : 5860270720 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 138fa882:0164da5b:5efea797:bddf6041
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jun 9 21:52:48 2014
Checksum : 1853e661 - correct
Events : 39295
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 2
Array State : AAAAAAAAA ('A' == active, '.' == missing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 2d18f556:0cbad263:017a87af:aadac8f7
Name : brain:0 (local to host brain)
Creation Time : Sun Mar 3 02:34:30 2013
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 20510947520 (19560.76 GiB 21003.21 GB)
Used Dev Size : 5860270720 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 96eb8a2f:03191596:5f97190b:60d0967e
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jun 9 21:52:48 2014
Checksum : b018818a - correct
Events : 39295
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 3
Array State : AAAAAAAAA ('A' == active, '.' == missing)
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 2d18f556:0cbad263:017a87af:aadac8f7
Name : brain:0 (local to host brain)
Creation Time : Sun Mar 3 02:34:30 2013
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 20510947520 (19560.76 GiB 21003.21 GB)
Used Dev Size : 5860270720 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 6886190c:e41800e8:452f1d0e:0f68dab6
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jun 9 21:52:48 2014
Checksum : 19d94bd4 - correct
Events : 39295
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 4
Array State : AAAAAAAAA ('A' == active, '.' == missing)
/dev/sdf:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 2d18f556:0cbad263:017a87af:aadac8f7
Name : brain:0 (local to host brain)
Creation Time : Sun Mar 3 02:34:30 2013
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 20510947520 (19560.76 GiB 21003.21 GB)
Used Dev Size : 5860270720 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : fa319bfb:ffe914f0:36423faf:33634092
Internal Bitmap : 8 sectors from superblock
Update Time : Mon Jun 9 21:52:48 2014
Checksum : 8df7d698 - correct
Events : 39295
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 5
Array State : AAAAAAAAA ('A' == active, '.' == missing)
/dev/sdg:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdh:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdi:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdj:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdk:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
