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    SubjectRe: RAID superblock confusion
    Mike Fedyk writes:
    > On Wed, Apr 10, 2002 at 02:37:48PM -0600, Richard Gooch wrote:
    > > Andreas Dilger writes:
    > > > On Apr 10, 2002 13:24 -0600, Richard Gooch wrote:
    > > > > Andreas Dilger writes:
    > > > > > On Apr 10, 2002 09:33 -0600, Richard Gooch wrote:
    > > > > > > Even though I'm using persistent superblockss, which is supposed to
    > > > > > > allow one to move devices from one controller to another, I can't
    > > > > > > use my RAID) set in this configuration. Looks like a bug.
    > > > > > >
    > > > > > > md0: former device scsi/host2/bus0/target1/lun0/part2 is unavailable,
    > > > > > > removing from array!
    > > > > > > md: md0, array needs 6 disks, has 5, aborting.
    > > > > >
    > > > > > Note that this appears to be your real problem.
    > > > >
    > > > > No. I tested all 6 partitions used in the RAID set. They are all
    > > > > available.
    > > >
    > > > Well, MD seems to think it is unavailable... I would check the
    > > > codepath that generates this message and see why it is happening.
    > > > Maybe it is a timing issue or something, that MD autostart is
    > > > starting before this device is set up or something? I don't know.
    > >
    > > The device is set up (i.e. SCSI host driver is loaded) long before I
    > > do raidstart /dev/md/0
    >
    > But kernel auto-detection doesn't depend on the raidstart command. If
    > things are setup correctly, you can remove that from your init scripts.

    I'm not (explicitely) using auto-detection. When I insmod the raid0
    module, there are no messages about finding devices. All I get is:
    md: raid0 personality registered as nr 2

    Only when I run raidstart do I get kernel messages about the devices.

    In any case, I should be able to move my devices around (especially
    if /etc/raidtab is still correct), whether or not autostart is
    running. The behaviour I'm observing is a bug (I assume it's not a
    mis-feature, since the raidstart man page tells me that moving devices
    around should be safe).

    Regards,

    Richard....
    Permanent: rgooch@atnf.csiro.au
    Current: rgooch@ras.ucalgary.ca
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