Re: ciss(4): speed degradation for Compaq Smart Array [edited]

From: Andre Guibert de Bruet (andy_at_siliconlandmark.com)
Date: 03/30/05

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    Date: Wed, 30 Mar 2005 13:06:22 -0500 (EST)
To: Andrey Koklin <aka@veco.ru>

    On Wed, 30 Mar 2005, Doug White wrote:
    > On Wed, 30 Mar 2005, Andrey Koklin wrote:
    >
    >> Firstly, I'm thankful to people who had found time to answer my previous
    >> messed post privately. Indeed, I hadn't put there key information about
    >> my system configuration, as well as the tests themselves say little or
    >> nothing on real disk system performance (they used 1K blocks and didn't
    >> take into consideration disks geometry).
    >
    > You've still omitted the array setup, including RAID type and stripe size.
    >
    > I'd also suggest using a tool like iozone to run your tests instead of dd.
    > Unless your workload consists of entirely sequential writes this perf test
    > is worthless.

    Even bonnie++ (Which benchmarks far more than just the underlying storage
    subsystem) would have been a better benchmark.

    An excellent series of DOs and DONTs messages were exchanged last year in
    January. An overview of the thread can be found at:
    http://blog.delphij.net/archives/000047.html

    Happy benchmarking! :-)
    Andy

    | Andre Guibert de Bruet | Enterprise Software Consultant >
    | Silicon Landmark, LLC. | http://siliconlandmark.com/ >
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