Your bottleneck is probably with the journal. When you write to an XFS file system it writes to a journal ahead of the data being written.
You can try some tweaks that effect the journal on the mount options (I think there are different modes) .
You can also put the journal on a different device, also I think you can disable it all together (if your not worried about data loss if the power fails, should not be a problem if you have a good UPS)
Last edited by CrazyNutz; 01-28-2013 at 04:51 PM.
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