Re: Very low disk performance Highpoint 1820a

From: Steven Hartland (killing_at_multiplay.co.uk)
Date: 04/28/05

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    To: Arne Wörner <arne_woerner@yahoo.com>, "Eric Anderson" <anderson@centtech.com>
Date: Thu, 28 Apr 2005 17:03:22 +0100

    Only on write this is a read test.
    ----- Original Message -----
    From: "Arne Wörner" <arne_woerner@yahoo.com>

    > Furthermore RAID-5 needs to read the parity block, before it can
    > update that block, so that there are 2 disc transactions more,
    > which could explain the better performance of a single disk, too?
    >
    > Or does the striping effect (inherent to RAID-5) compensate those
    > 2 extra transactions (at least in case of sequential writes)?

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