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)? ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.
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