bad performance on 3 of 20 boxes with 3ware card

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I hae 20 identical boxes (2x 4-core cpus, 64G ram, 16x1TB SATA drives on 07:00.0 RAID bus controller: 3ware Inc 9650SE SATA-II RAID (rev 01) raid 6) running linux 2.6.30

on 3 of the 20 I seem to have a max write speed of ~5MB/sec (as opposed to
100 MB/sec)

any pointers on how I can identify what is different about these three boxes?

David Lang

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