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Old 03-27-2010, 07:11 AM   #1
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Mdadm raid0 and ubuntu server boot problem

I have ubuntu server 8.04 installed.
It uses software raid0 (mdadm, two hard disks: sda and sdb).

The server crashed after power failure. When trying to boot I get the following messages:

ata3.00: revalidateion failed (errno=-2)
JBD: Failed to read block at offset 1599
EXT-fs: error loading jounal.
Buffer I/O error on device md0, logical block 1289
Afterwards BusyBox loads and that's it.

cat /proc/mdstat gives the following:
md0: active raid0 sda6[0] sdb6[1]
971868032 blocks 64k chunks
When booting from live cd fdisk -l shows all partitions correctly both on /dev/sda and /dev/sdb.
Tried gParted Live Cd, gParted correctly identifies raid0 but check fails.

Any suggestions please? Data on these disks is of high importance for me...
Old 03-27-2010, 07:24 AM   #2
Registered: Feb 2010
Distribution: gentoo, arch, fedora, freebsd
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what output of fsck /dev/md0 ?
Old 03-27-2010, 07:29 AM   #3
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Originally Posted by troop View Post
what output of fsck /dev/md0 ?
 No such file or directory while trying to open /dev/md0
The superblock couln not be read or doe not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2...
e2fsck -b 8193 gives the same output
Old 03-29-2010, 03:59 AM   #4
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It turned out that the problem is with the first hard disk. Tried to make an image of it with
ddrescue --no-split /dev/sda /media/sdc1/home/anzolis/image /media/sdc1/home/anzolis/logfile
It outputs that errsize is equal to the disk size i.e. the disk is one big error!

Ddrescue copied perfectly (with no errors at all) /dev/sdb, the second disk in the raid.

Is it possible that the problem is with the logic board of hard disk /dev/sda? The second hard disk (/dev/sdb) is of the same model and thus has absolutely the same logic board, so I can try to replace it. Or is the problem mechanical (I don't really know what to do in this case)?

I need your advice very very much. My head is already boiling with all this stuff.



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