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    SubjectRe: RAID-1 performance under 2.4 and 2.6
    On Tue, Mar 25, 2008 at 7:43 PM, Emmanuel Florac <> wrote:
    > dd if=/dev/zero of=/mountpoint/testfile bs=1M count=1024

    Keep in mind that the above test tests two subsystems at the same
    time: RAID-1 + the filesystem on top of it. If you want to test RAID-1
    performance you should specify a raw device to of=... instead of a
    file (and the direct I/O flags). There are considerable performance
    differences between filesystems for large files. E.g. XFS is a lot
    faster than ext3 for large files (gigabytes).


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