That's kind of weird because I use to have a huge md10 partition with a monstruous amount of important files.
I have no idea where to start!
I tried to examine the partitions in the multi-disk :
Code:
root@titan:~# mdadm --examine /dev/sda10
/dev/sda10:
Magic : a92b4efc
Version : 00.90.00
UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
Creation Time : Sat Apr 17 16:30:50 2010
Raid Level : raid5
Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 10
Update Time : Sun Jun 5 16:00:41 2011
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : ac3fac12 - correct
Events : 2552115
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 10 0 active sync /dev/sda10
0 0 8 10 0 active sync /dev/sda10
1 1 8 26 1 active sync /dev/sdb10
2 2 8 42 2 active sync /dev/sdc10
3 3 8 58 3 active sync /dev/sdd10
root@titan:~# mdadm --examine /dev/sdb10
/dev/sdb10:
Magic : a92b4efc
Version : 00.90.00
UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
Creation Time : Sat Apr 17 16:30:50 2010
Raid Level : raid5
Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 10
Update Time : Mon Jan 23 12:05:02 2012
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 1
Spare Devices : 0
Checksum : ade16f37 - correct
Events : 6224199
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 26 1 active sync /dev/sdb10
0 0 0 0 0 removed
1 1 8 26 1 active sync /dev/sdb10
2 2 0 0 2 faulty removed
3 3 8 58 3 active sync /dev/sdd10
root@titan:~# mdadm --examine /dev/sdc10
/dev/sdc10:
Magic : a92b4efc
Version : 00.90.00
UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
Creation Time : Sat Apr 17 16:30:50 2010
Raid Level : raid5
Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 10
Update Time : Fri Jan 20 23:16:43 2012
State : active
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Checksum : ad7f1c03 - correct
Events : 6223465
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 42 2 active sync /dev/sdc10
0 0 0 0 0 removed
1 1 8 26 1 active sync /dev/sdb10
2 2 8 42 2 active sync /dev/sdc10
3 3 8 58 3 active sync /dev/sdd10
root@titan:~# mdadm --examine /dev/sdd10
/dev/sdd10:
Magic : a92b4efc
Version : 00.90.00
UUID : 0b972a2e:3aaabcf9:a4d2adc2:26fd5302
Creation Time : Sat Apr 17 16:30:50 2010
Raid Level : raid5
Used Dev Size : 1459502912 (1391.89 GiB 1494.53 GB)
Array Size : 4378508736 (4175.67 GiB 4483.59 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 10
Update Time : Mon Jan 23 12:05:02 2012
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 1
Spare Devices : 0
Checksum : ade16f5b - correct
Events : 6224199
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 58 3 active sync /dev/sdd10
0 0 0 0 0 removed
1 1 8 26 1 active sync /dev/sdb10
2 2 0 0 2 faulty removed
3 3 8 58 3 active sync /dev/sdd10
But that doesn't really help...
I have no idea how to interpret the results!
I'm scared with the "faulty" and "removed" warnings.
Can anyone give me a hint?
Is there any other command I can run to regain access to the data, at least read-only?
OK, thanks to your pieces of advice, I went a little further :
I can tell that two of my 4 disks are removed from the array.
Code:
# mdadm --examine /dev/sda10 | grep 'Update Time'
Update Time : Sun Jun 5 16:00:41 2011
# mdadm --examine /dev/sdb10 | grep 'Update Time'
Update Time : Mon Jan 23 12:05:02 2012
# mdadm --examine /dev/sdc10 | grep 'Update Time'
Update Time : Fri Jan 20 23:16:43 2012
# mdadm --examine /dev/sdd10 | grep 'Update Time'
Update Time : Mon Jan 23 12:05:02 2012
One failed in june 2011, the second one failed 5 days ago.
I thought that RAID5 would turn read only as soon as one disk fails.
Does anyone knows more?
Please let's not discuss how crazy it is to have let my RAID5 run with one disk removed during 6 month. I didn't know what SMART was before now (belive me I'm reading the manual).
For more information, here is the status of the array
So I thought I should just check the disks.
Problem: fsck doesn't work:
Code:
root@titan:~# fsck.ext3 /dev/sdc10
#e2fsck 1.41.3 (12-Oct-2008)
fsck.ext3: Superblock invalid, trying backup blocks...
fsck.ext3: Bad magic number in super-block while trying to open /dev/sdc10
The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
root@titan:~# fsck.ext3 -b 8193 /dev/sdc10
e2fsck 1.41.3 (12-Oct-2008)
fsck.ext3: Bad magic number in super-block while trying to open /dev/sdc10
The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
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