Date: 31 Mar 2003 15:55:44 -0600 From: Craig Boston <craig@meoqu.gank.org> To: Jason Andresen <jandrese@mitre.org> Cc: FreeBSD Stable List <freebsd-stable@freebsd.org> Subject: Re: vinum performance Message-ID: <1049147744.98637.57.camel@owen1492.uf.corelab.com> In-Reply-To: <3E88B601.90802@mitre.org> References: <20030330125138.K23911@leelou.in.tern> <3E870CC7.5000204@mac.com> <20030330175605.E23911@leelou.in.tern> <3E87204C.5060304@ludd.luth.se> <3E88524A.1060600@mitre.org> <3E88AECD.10607@liwing.de> <3E88B601.90802@mitre.org>
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On Mon, 2003-03-31 at 15:41, Jason Andresen wrote: > (Both of these were on previously untouched files to prevent any > caching, and the "write" test is on a new file, not rewriting an old one) > Write speed: > 81920000 bytes transferred in 3.761307 secs (21779663 bytes/sec) > Read speed: > 81920000 bytes transferred in 3.488978 secs (23479655 bytes/sec) > > But on the RAID5: > Write speed: > 81920000 bytes transferred in 17.651300 secs (4641018 bytes/sec) > Read speed: > 81920000 bytes transferred in 4.304083 secs (19033090 bytes/sec) Disclaimer: IANAVE (I am not a Vinum Expert) What block size are you using with dd? If your bs= is less than your RAID stripe size, it seems like it would end up doing unnecessary read-modify-write cycles... Craig
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