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    SubjectRe: 2.6.0, SiI3112, md raid1 problem: bio too big device (128 > 15)
    On Tuesday December 23, jim+linux-kernel@jimlawson.org wrote:
    > Hi all,
    >
    > I am having trouble creating a raid1 array under 2.6.0. I am able to
    > create raid0 and raid5 mds, but raid1s fail with "bio too big device hde3
    > (128 > 15)", which doesn't tell me a lot. I can see it's in
    > drivers/block/ll_rw_blk.c, right at the boundary with the device driver,
    > but I'm not enough of a kernel wonk to find out a lot more.

    This is a raid1 bug.
    Some block devices have limits on the sizes of io requests that they
    can handle, and advertise these limits with ->max_sectors and
    ->merge_bvec_fn (and a few others). Any device MUST be able to accept
    a single page IO at any offset.

    When raid1 does a 'resync' it does all IO in 64K requests, ignoring
    the restrictions.
    Getting raid1 resync to handle the restrictions is non-trivial (I have
    code, but it is still buggy).

    A simple interim fix is to replace

    #define RESYNC_BLOCK_SIZE (64*1024)

    with

    #define RESYNC_BLOCK_SIZE PAGE_SIZE

    NeilBrown
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