Messages in this thread | | | Date | Wed, 26 Mar 2008 09:42:19 +0100 | From | "Bart Van Assche" <> | Subject | Re: RAID-1 performance under 2.4 and 2.6 |
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On Tue, Mar 25, 2008 at 7:43 PM, Emmanuel Florac <eflorac@intellique.com> 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).
Bart.
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