Re: I have a failed disk need help!

On Thursday March 27, danfisher@xxxxxxxxx wrote:
> We were preforming system updates on the system and had pulled the master
> out to keep a backup incase of disaster.  And so disaster hit and we want
> to reraid the master to the slave - Not so easy.  The kernel keeps wanting
> to use hdb but we want to mark hdb as failed and get it to boot to hda when
> hdb is in the mirror.

boot with kernel parameters:
   raid=noautodetect md=0,/dev/hda1 root=/dev/md0

(I assume /dev/hda1 is mirrored with /dev/hdb1 to form /dev/md0.  If
not, give more details, or just make obvious changes).

Then once you have booted, you can

  mdadm /dev/md0 -a /dev/hdb1
to add in /dev/hdb1.

If normally autodetect several partitions, you might want:

   raid=noautodetct md=0,/dev/hda1 md=1,/dev/hda2 md=2,/dev/hda3  .... 
root=/dev/md0

NeilBrown
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html