/dev/md0 can’t read superblock

Sometimes when my Stora NAS gets rebooted the array fails to mount and I get

/dev/md0 can't read superblock

To correct this I do the following:

  1. Try mount /dev/md0 (you probably tried this and got the above error)
  2. Do xfs_repair /dev/md0
  3. If that refuses to repair then do xfs_repair -L /dev/md0

No guarantees this won’t screw things up for you but it works for me.

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