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    SubjectRe: [2.6.27.6] jfs on raid1 => attempt to access beyond end of device.
    On Thu, November 20, 2008 8:03 pm, Pawe³ Sikora wrote:
    > hi,
    >
    > few hours ago i've set up jfs filesystems on raid1 and raid0.
    > during restoring backup i've got an errors in dmesg.
    > the testcase on my system is easy and 100% reproducible:
    > just do the following command on jfs/raid1 device:
    ....

    > /dev/sda2 * 748 2206 11719417+ fd Linux raid
    ^^^^^^^^^
    size of sda2 is Kilobytes - 23438835 sectors.


    >
    > md0 : active raid1 sda2[0] sdb2[1]
    > 11719296 blocks [2/2] [UU]
    ^^^^^^^^

    size of md0 in kilobytes - 23438592 sectors.


    > [ 5583.796222] attempt to access beyond end of device
    > [ 5583.796227] md0: rw=1, want=23438832, limit=23438592
    Largest 'want' value.

    'want' is just less than size of sda2
    'limit' is exactly size of md0 (no surprise there).

    > any ideas what's wrong?

    I suspect you created the filesystem on /dev/sda2, not realising
    that when you created a raid1 from sda2 and sdb2 it would be slightly
    smaller than sda2 (as md used up to 120K for metadata storage).

    NeilBrown

    (P.S. I love it when people provide all the details thus making it
    easier for me to spot what is happening - thanks!)

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