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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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    :.........................: putrid forms of man :
    : Jakob Østergaard : See him rise and claim the earth, :
    : OZ9ABN : his downfall is at hand. :
    :.........................:............{Konkhra}...............:
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