Re: RAID5 failure; possible to repair?

[Daniel Koch]

   - Zero all the superblocks on all the disks. (mdadm --zero-superblock
   /dev/sd{b..d})
   - Recreate the array with the "--assume-clean" option. (mdadm --create
   --verbose /dev/md0 --auto=yes --assume-clean --level=5 --raid-devices=3
   /dev/sdb /dev/sdc /dev/sdd)
   - Mark it possibly dirty with: "mdadm --assemble /dev/md0
   --update=resync"
   - Let it resync
   - Mount it and see if it is restored

If this is not working your raid is lost.