Date: Tue, 28 May 2002 09:59:48 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Cy Schubert - CITS Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> Cc: Kirk Strauser <kirk@strauser.com>, freebsd-stable@FreeBSD.ORG Subject: Re: Hardware RAID vs vinum Message-ID: <20020528095948.D16567@wantadilla.lemis.com> In-Reply-To: <200205271302.g4RD2Nr1099239@cwsys.cwsent.com> References: <kirk@strauser.com> <87r8jy9ri6.fsf@pooh.int> <200205271302.g4RD2Nr1099239@cwsys.cwsent.com>
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On Monday, 27 May 2002 at 6:02:23 -0700, Cy Schubert - CITS Open Systems Group wrote: > > It turned out that moving the application to hardware RAID improved > performance by 40 times. This can only happen if there's something very wrong with the software RAID-5, either the implementation or the configuration. One thing that springs to mind is too small a stripe size. There's a myth going around that this improves performance, when in fact it seriously degrades it. I believe that some hardware RAID controllers may require it because of the algorithms the firmware uses, but that doesn't make it a good idea. 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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