Re: Degraded array on every reboot

[David Greaves <david@dgreaves.com>]

John Hendrikx wrote:
> I'm not sure why this keeps going wrong, but I do know I made a mistake
> when initially reconstructing the array.  What I did was the following:
> 
> # mdadm /dev/md1 --add /dev/hde
> 
> Releazing that I didn't want to add the complete drive (/dev/hde) but only
> one of its partitions (/dev/hde1) I then did (while it was still
> rebuilding):
> 
> # mdadm /dev/md1 --fail /dev/hde
> # mdadm /dev/md1 --remove /dev/hde

I'm not 100% sure but it *may* have rebuilt the superblock.

do:
  mdadm --examine /dev/hde
  mdadm --examine /dev/hde1

If hde has a superblock then that could be picked up before the hde1 one.

(ah, read more of your email and you were on the right tracks :) )

To fix this do:
  mdadm --zero-superblock /dev/hde

Once all this is done you may want to run a check on the array.

There's probably other stuff going on with partition table caches too - blockdev 
-rereadpt may make a difference... but I suspect the --zero-superblock will just 
fix it all on the next boot.

David