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    SubjectRe: RAID-1 performance under 2.4 and 2.6
    On Wed, Mar 26, 2008 at 12:07 PM, Emmanuel Florac
    <eflorac@intellique.com> wrote:
    > Le Wed, 26 Mar 2008 09:42:19 +0100
    > "Bart Van Assche" <bart.vanassche@gmail.com> écrivait:
    >
    > > Keep in mind that the above test tests two subsystems at the same
    > > time: RAID-1 + the filesystem on top of it.
    >
    > I'm using XFS usually, and I've also checked against the raw devices
    > and it looks the same (2.4 still faster). I must add that the difference
    > is somewhat reduced when using a single disk drive vs. RAID-1,
    > obviously due to different buffering policy in the RAID subsystem.

    You are welcome to post the numbers you obtained with dd for direct
    I/O on a RAID-1 setup for 2.4 versus 2.6 kernel.

    Bart.
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