Date: Tue, 3 May 2005 13:45:30 +0200 (CEST) From: kama <kama@pvp.se> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: =?ISO-8859-15?Q?=22Arne_=5C=22W=F6rner=5C=22=22?= <arne_woerner@yahoo.com> Subject: Re: Very low disk performance on 5.x Message-ID: <20050503134451.P22614@ns1.as.pvp.se> In-Reply-To: <17442.1115039706@critter.freebsd.dk> References: <17442.1115039706@critter.freebsd.dk>
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On Mon, 2 May 2005, Poul-Henning Kamp wrote: > In message <427626DC.5030702@centtech.com>, Eric Anderson writes: > > >Don't mean to be terse here, but I'm talking about the same test done an > >two different RAID5 configurations, with different disks, and not just > >me - other users in this very thread see the same issue.. > > Uhm, if you are using RAID5 and your requests are not aligned and > sized after the RAID5 you should *expect* read performance to be poor. > > If you your request ends up accessing two different blocks even just > once per stripe, this totally kills performance. My system is setup with RAID 1+0. So its not a RAID5 issue...
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