[RndTbl] Desperate plea for help

Kevin McGregor kevin.a.mcgregor at gmail.com
Mon Jun 7 11:14:23 CDT 2010

Well, we got lucky and it is back in operation. There are 14 drive bays, so
an exhaustive search of the permutations would be time-prohibitive. I'll
label the drives from now on when I'm doing something like this!

On Mon, Jun 7, 2010 at 8:34 AM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> On 2010-06-04 Kevin McGregor wrote:
> > I've got a HP ProLiant server running OpenFiler, and due to errors on
> > my part, the SCSI drives got rearranged. Now the HP 6400 RAID
> > controller complains that an "unsupported drive rearrangement has
> > been attempted", and the logical volume is missing. Is there any way
> > to recover the correct order of drives in the drive bay?
> Very very strange that the physical ordering is important!  If Adam
> hasn't already helped :-) ... here's my 2c:
> How many drives are we talking?  If it's not large, there should be
> only so many permutations and if you try every single one, one should
> just magically work.
> > Suggestions, aside from "use software RAID next time"?
> If the data was super important, you could hook up the drives in a
> non-raid environment and do so byte-level peeking to  try to figure out
> the data arrangement (what raid level was it?), stripe sizes, etc.
> That should be possible and from then a simple perl program could
> extract all the data at the block level in the right order and dump to
> another huge disk or array.  I think I could probably pull it off
> unless the controller is doing something really wacky.  I've done
> similar things in the past during raid disasters of my own (years ago
> when I learned (the hard way) the value of RAID6 over RAID5).
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