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    SubjectRe: 2.6.15-mm2
    On Thu, Jan 12 2006, Neil Brown wrote:
    > On Wednesday January 11, axboe@suse.de wrote:
    > >
    > > Then the barrier changes from git2 -> git3 should not have anything to
    > > do with it. Strange... I guess you should try the git bisect method to
    > > narrow it down.
    >
    > Not true, though you seem to have already figured that out.
    >
    > md uses barrier writes when writing the superblock. This is partly
    > because it seems like a good idea, but largely to test if barrier
    > writes are going to work on the component devices. If any device
    > claims not to support barriers, then raid1 will claim not to support
    > barriers.
    >
    > And the strange hang happens while md is trying to update the
    > superblock.

    Yeah that's what I found out later on in the thread, indeed killing that
    barrier write made the problem disappear.

    --
    Jens Axboe

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