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    SubjectRe: 2.6.19-mm1 (md/raid1 randomly drops partitions - possible sata_uli problem)
    On Tuesday December 12, rjw@sisk.pl wrote:
    > >
    > > So when md writes to write out the superblock, to gets EIO... Odd that
    > > you aren't getting errors for normal writes.
    > >
    > > What devices are the md/raid1 built on?
    >
    > Sata drives, on sata_uli.
    >
    > > >
    > > > I'll try to reproduce it tomorrow and collect some more information.
    > >
    > > Thanks. More information is definitely better than less, so send over
    > > anything you can find.
    >
    > Okay, seems to be readily reproducible, dmesg output from the failing kernel
    > attached.

    Weird. You are getting silent write errors...

    Can you write to these drives are all? e.g.

    dd if=/dev/sdb3 of=/tmp/tmp count=1
    dd if=/tmp/tmp of=/dev/sdb3 oflag=direct

    (hopefully 'direct' will cause write errors to be passed up).

    I really think this looks like a sata problem, not an md problem.

    NeilBrown
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