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I built a RAID-1 with two hard drives using mdadm. Command used was:

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc

it went fine, I create partition table and partitions in it, mounted put some files there. Then I rebooted and realized I did not update mdadm.conf. How do I get my RAID back without losing data?

Update: results of --examine and --assemble commands:

# mdadm --examine /dev/sdb
/dev/sdb:
   MBR Magic : aa55
Partition[0] :   4294967295 sectors at            1 (type ee)

# mdadm --assemble /dev/md0 /dev/sdb /dev/sdc
mdadm: Cannot assemble mbr metadata on /dev/sdb
mdadm: /dev/sdb has no superblock - assembly aborted

Does it make any difference that I created RAID on whole device instead of single partition?

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If it were me I would do something like this.

  • Run the examine command against one of the member drives/partitions: mdadm --examine /dev/sdc`
  • Look for the Array UUID value.
  • Update your mdadm.conf with the array UUID value.

Something like this, using your UUID.

ARRAY /dev/md/0 metadata=1.2 UUID=326e64b6:1af3dfb4:e1fc5d41:ebd329b0 
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  • See my update. There is no UUID in --examine output.
    – n0rd
    Feb 27 '14 at 2:56

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