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

From: Doug White (dwhite_at_gumbysoft.com)
Date: 03/30/05

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    Date: Wed, 30 Mar 2005 09:09:40 -0800 (PST)
To: Andrey Koklin <aka@veco.ru>

    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. 

    -- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org
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