Qlogic 2200 performance issues?

From: Kelsey Cummings (kgc_at_sonic.net)
Date: 07/16/03

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To: freebsd-performance@freebsd.org

    We've got a 5.1 box that we are using to play around with vinum and fcal.
    It's a dual PIII-800, gig of ram, etc.

    The Qlogic 2200 has 2 old NetApp FC8 shelves on them, with 14 disks. Each
    one of these disks is able to do a sustained 17MBs in sequential IO.
    However, when all disks are accessed at once sustained I/O drops to ~1-4MBs
    per device, or ~28MBs total for all devices together. We see the same problem
    with vinum, stipping all 14 disks together results in ~28MBs, which is the
    same as what's gotten with 2, 4, 6, 8, .. disks. During these tests the
    box is responsive, CPU ultilization is minimal, etc.

    We don't have much experience with fcal here but this doesn't make alot of
    sense to us. It would appear that the controller or loop is getting
    staturated at only 28MBs? Can anyone shed some light?

    We've just be using dd (single and multiple processes) to test the
    sequential IO throughput. 

    -- 
Kelsey Cummings - kgc@sonic.net         sonic.net
System Administrator                    2260 Apollo Way
707.522.1000 (Voice)                    Santa Rosa, CA 95407
707.547.2199 (Fax)                      http://www.sonic.net/
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