Date: Mon, 27 May 2002 22:48:54 +0900 (JST) From: Tod McQuillin <devin@spamcop.net> To: Miguel Mendez <flynn@energyhq.homeip.net> Cc: Cy Schubert - CITS Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, Kirk Strauser <kirk@strauser.com>, <freebsd-stable@FreeBSD.ORG> Subject: Re: Hardware RAID vs vinum Message-ID: <20020527224614.V424-100000@glass.pun-pun.prv> In-Reply-To: <20020527153552.A72342@energyhq.homeip.net>
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On Mon, 27 May 2002, Miguel Mendez wrote: > On Mon, May 27, 2002 at 06:02:23AM -0700, Cy Schubert - CITS Open Systems Group wrote: > > > Did we see a difference in CPU utilization? No. However ODS and VxVM > > run below the kernel and cannot be measured by vmstat or sar, which is > > different to how vinum works because it is part of the kernel. > > I feel curious about this. Both ODS and VxVM are just kernel modules > that sit between hardware and the VFS layer if I'm not mistaken. What > makes them different than vinum? I don't have experience with vinum, but we also experienced terrible performance with Sun's ODS and software RAID-5. We didn't notice similar problams with Veritas volume manager. I'm beginning to think it's peculiar to ODS, and that other software RAID-5 implementations probably work a lot better. -- Tod McQuillin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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