Date: Fri, 8 Sep 2000 12:55:51 -0700 From: Clark Shishido <clark@desktop.com> To: Esko Petteri Matinsola <esko@kapi.net>, hackers@FreeBSD.ORG Subject: Re: Vinum RAID-5 performance problem Message-ID: <v0422080bb5def254254a@[192.168.1.42]> In-Reply-To: <Pine.BSF.4.10.10009082147290.46483-100000@sputnik> References: <Pine.BSF.4.10.10009082147290.46483-100000@sputnik>
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At 22:24 +0300 2000.09.08, Esko Petteri Matinsola wrote: > >read performance and seeks seems OK, but block writes only about 1/9th ! >As I read from www.vinumvm.org I should get something like 5MBps block >writes. > >Have I misunderstood something, configured someting improperly, it's >because of only two IDE-controllers or why I get so lousy write >performance ? Your configuration looks fine. I just recently tried a similar setup using Promise Ultra66 controllers with some Quantum and IBM drives (tried both). I got lousy performance doing sustained writes to a RAID5 volume, using 4 UDMA66 drives each a master on a controller. just doing a cat /dev/zero > blah I just decided to stick with striping and make regular backups. I may try vinum with RAID5 on a SCSI array later. FWIW, FreeBSD 4.1-STABLE Abit BP6 dual 466 Celerons (not using the HPT controller) Promise Ultra66 Quantum KA 13.6 gig and IBM Deskstar 30 gig drives --clark To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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