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SubjectRe: AARGH! Please help. IDE controller fsckup
On Wed, Oct 02, 2002 at 03:16:46PM +0200, Roy Sigurd Karlsbakk wrote:
> hi all
>
> I have this cute little server with some 16 120gig IDE drives, and I've got
> some serious problems with it.
>
> Controllers:
> One onboard IDE controller (2 channels).
> Two promise ATA100 (2 channels each).
> One CMD649 (2 channels).
>
> something seriously bad about the CMD649 makes Linux beleive it's the first
> controller with hd[abcd]. On these, there are two RAID-1s (/ and /var). Due
> to the fact that the box has some 1,6TB disk space, we haven't got any backup
> solution (we have an identical box in order to mirror them).
>
> so - now - the CMD649 has suddenly begun to fail - losing contact with one or
> two drives, and I _really_ need to get what's on /data (RAID-5 on
> hd[efghijklmnop]) out. Problem is - the replacement controller I've got from
> the vendor works fine (turns up as controller 3 serving hd[mnop]). How can I
> revert this most easily to be able to boot again?

Hindsight: had you used persistent superblocks, this would not have
been a problem. The kernel would know the correct ordering from the
superblocks, not the device names.

Solution 1: Write to the RAID mailing list and have one of the mdadm
gurus give you a one-liner to initialize the array with the proper
ordering.

Solution 2: Edit your /etc/raidtab to reflect the new device naming and
run raidstart.

If you start up the array with a bad ordering, no amount of magic is
going to bring back you data (after parity has been "reconstructed" on
various chunks of your existing data).


>
> I hope this is not too off topic... Please excuse that.
>

linux-raid is a better place.


Cheers,

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