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Date:      Thu, 28 Apr 2005 17:03:22 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        =?iso-8859-1?Q?Arne_W=F6rner?= <arne_woerner@yahoo.com>, "Eric Anderson" <anderson@centtech.com>
Cc:        freebsd-performance@freebsd.org
Subject:   Re: Very low disk performance Highpoint 1820a
Message-ID:  <070201c54c0b$cd889a00$7f06000a@int.mediasurface.com>
References:  <20050428155908.41481.qmail@web41201.mail.yahoo.com>

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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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