Date: Thu, 28 Apr 2005 12:02:30 -0500 From: Eric Anderson <anderson@centtech.com> To: =?ISO-8859-15?Q?=22Arne_=5C=22W=F6rner=5C=22=22?= <arne_woerner@yahoo.com> Cc: Steven Hartland <killing@multiplay.co.uk> Subject: Re: Very low disk performance Highpoint 1820a Message-ID: <42711726.2000607@centtech.com> In-Reply-To: <20050428162201.39269.qmail@web41214.mail.yahoo.com> References: <20050428162201.39269.qmail@web41214.mail.yahoo.com>
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Arne W=F6rner wrote: > --- Steven Hartland <killing@multiplay.co.uk> wrote: >=20 >>Only on write this is a read test. >> >=20 > Oh. Ok! :-) >=20 > But there is a striping-like effect (especially when u use n=3D8 > discs in one RAID-5 and when u do sequential read), so that the > performance could be easily (n-1)*40MB/sec (which would be in your > case 350MB/sec; my single ATA disc reads 40 or about 40 MB/sec). >=20 > So I would say, that something in the ATA driver is sub-optimal > and worse than before. But I do not know what... There are so many > lines... I don't think it is ATA related - my tests were through a Fiber Channel=20 card. My reads were 1/2 of my writes.. Eric --=20 ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------
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