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Thread: drive speeds and striping

  1. #1

    drive speeds and striping

    my drive performance is not what i'm expecting...

    dual 76 Gb SCSI U320 15000 rpm drives (cheetah - seagate)
    adaptec scsi controller
    drives are striped with 16k striping
    pentium IV 2.6 Gb processor
    1 Gb RAM


    i've reformatted my drives, done a clean reinstall of XP Pro
    updated the drivers with the latest SCSI drivers from adaptec site

    disktest.exe and autoconfig show R/W speeds at around 40-60 Mb/s even with winrtme killed

    my ide drives clock at around 80/60 R/W

    is this the normal/expected performance? somehow i would have expected something at least in the 80s or 100s

    i have drive indexing disabled

    any ideas? thanks!
    mark

  2. #2
    Avid Killer Dan Hong's Avatar
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    Feb 2003
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    Modesto, California
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    Have you unstriped and tested the SCSI drives individually? It sounds like you may have one bad drive.
    Dan Hong
    http://www.gnoasis.com

  3. #3
    good idea, dan...
    i will try this later today
    thanks
    mark

  4. #4
    dan - one question...

    this drive is a "basic" drive - should i first convert this to a dynamic drive and would that make a difference in my R/W performance?

    mark

  5. #5
    Avid Killer Dan Hong's Avatar
    Join Date
    Feb 2003
    Location
    Modesto, California
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    182
    As far as separating the disks to test them individually, they should be basic and formatted separately. When they are together as a striped set they should be dynamic.
    Dan Hong
    http://www.gnoasis.com

  6. #6
    TADA!!

    dan - that seemed to work. i converted the drive to dynamic (striped) and the throughput immediately jumped up to 106 (peak) and in the 80s (ave).

    i'm in business

    thanks!
    mark

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