Date: Tue, 28 May 2002 09:56:49 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> 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: <20020528095649.B16567@wantadilla.lemis.com> In-Reply-To: <20020527153552.A72342@energyhq.homeip.net> References: <kirk@strauser.com> <200205271302.g4RD2Nr1099239@cwsys.cwsent.com> <20020527153552.A72342@energyhq.homeip.net>
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On Monday, 27 May 2002 at 15:35:52 +0200, 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 think vinum is, essentially, a Volume > Manager clone, with it's own enhancements, so I'd expect a simillar > behaviour of both programs. Agreed. I have trouble with this statement too. > OTOH, and don't quote me on this because it's been almost 2 years > since I last used VxVM, there's a way to gather cpu/system resources > usage with some tools that come with Volume Manager. > > I agree that having hardware RAID in a box that is running a > Database will improve performance noticeably. I don't think you can say that in all cases. It depends a lot on what you're comparing. Greg -- See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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