Skal vi se. Muligens getting somewhere etter å ha lagt ut en post på 
www.linux1.no. Admin der mente at problemet var at RAID'et hadde ramla sammen.
Etter å ha kjørt:
cthulhu:/# mdadm --assemble /dev/md0 /dev/sda1 /dev/sdc1 /dev/sdd1
mdadm: /dev/md0 has been started with 3 drives.
Ser fdisk -l slik ut:
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0004ece8
 Device Boot   Start    End   Blocks Id System
/dev/sda1       1   121601 976760001 fd Linux raid autodetect
Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0005ff43
 Device Boot   Start    End   Blocks Id System
/dev/sdb1 *     1   29164 234259798+ 83 Linux
/dev/sdb2     29165   30401  9936202+ 5 Extended
/dev/sdb5     29165   30401  9936171 82 Linux swap / Solaris
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00069a89
 Device Boot   Start    End   Blocks Id System
/dev/sdc1       1   121601 976760001 fd Linux raid autodetect
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00072a15
 Device Boot   Start    End   Blocks Id System
/dev/sdd1       1   121601 976760001 fd Linux raid autodetect
Disk /dev/md0: 2000.4 GB, 2000404348928 bytes
2 heads, 4 sectors/track, 488379968 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000
cthulhu:/# mdadm --examine /dev/md0
mdadm: No md superblock detected on /dev/md0.
Skal det være en superblock på RAID'et?