Date: Mon, 30 Oct 2006 12:02:11 +1030 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Petri Helenius <pete@he.iki.fi> Cc: Steve Peterson <stevep-hv@zpfe.com>, performance@freebsd.org Subject: Re: gvinum raid5 performance seems slow Message-ID: <20061030013211.GC1052@wantadilla.lemis.com> In-Reply-To: <4543AD35.30205@he.iki.fi> References: <6.2.3.4.0.20061027180329.020bed68@localhost> <4542D941.2070204@centtech.com> <6.2.3.4.0.20061028124559.02105930@localhost> <4543AD35.30205@he.iki.fi>
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--f0KYrhQ4vYSV2aJu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Saturday, 28 October 2006 at 22:19:17 +0300, Petri Helenius wrote: > > According to my understanding vinum does not overlap requests to > multiple disks when running in raid5 configuration Yes, it does. I suspect that gvinum does too. > so you're not going to achieve good numbers with just "single > stream" tests. Single stream tests aren't very good examples for RAID-5, because it performs writes in two steps: first it reads the old data, then it writes the new data. Greg [trailing junk omitted] -- See complete headers for address and phone numbers. --f0KYrhQ4vYSV2aJu Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFFRVYbIubykFB6QiMRAgqyAJ9vWtgQkDf2hncrSNu/bQLtBvsbsQCfaYki /5vq36mnqiI8TMseXtc2qfk= =hJ3d -----END PGP SIGNATURE----- --f0KYrhQ4vYSV2aJu--
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