[mythtv-users] Totally OT - but need help wit RAID5 array

[Robin Hill]

On Thu Nov 16, 2006 at 08:24:05PM -0500, James Pifer wrote:

> ok, dd_rhelp finished. I switched the drives so the good drive is now
> hdb. It still won't let me bring up md0:
> [root at storage ~]# mdadm --assemble /dev/md0 --force /dev/hdb /dev/hdc
> mdadm: /dev/md0 assembled from 1 drive - not enough to start the array.
> 
That's odd - the query information all looks okay.  The UUID for the
drives is the same so it should see them as being in the same array.

All I can think of now is to re-create the array using the
--assume-clean flag (so use the same command as earlier, including the
typo, but put a --assume-clean after the /dev/md0) .  This should
rewrite the metadata without touching the actual data.  I've never used
this myself and it does come with a warning in the manual page, but if
it won't assemble the array then I can't see any other solution.

If you do get the array working again with two drives, run a fsck on it,
then hot-add the third drive (mdmadm -a /dev/md0 /dev/hdd).

HTH,
        Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <myth at robinhill.me.uk>  |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |
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