From owner-freebsd-performance@FreeBSD.ORG Sat Aug 21 08:45:28 2004 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 46D7416A4CE; Sat, 21 Aug 2004 08:45:28 +0000 (GMT) Received: from darkness.comp.waw.pl (darkness.comp.waw.pl [195.117.238.236]) by mx1.FreeBSD.org (Postfix) with ESMTP id E314D43D39; Sat, 21 Aug 2004 08:45:27 +0000 (GMT) (envelope-from pjd@darkness.comp.waw.pl) Received: by darkness.comp.waw.pl (Postfix, from userid 1009) id ACB2DAC977; Sat, 21 Aug 2004 10:45:26 +0200 (CEST) Date: Sat, 21 Aug 2004 10:45:26 +0200 From: Pawel Jakub Dawidek To: "Kenneth D. Merry" Message-ID: <20040821084526.GF30151@darkness.comp.waw.pl> References: <200408161043.i7GAhfXs079045@repoman.freebsd.org> <20040817004407.GA81257@wantadilla.lemis.com> <20040817074633.GO30151@darkness.comp.waw.pl> <20040817112900.GA31635@freebie.xs4all.nl> <20040817124020.GK88156@wantadilla.lemis.com> <20040817131612.GT30151@darkness.comp.waw.pl> <20040819024359.GA85432@wantadilla.lemis.com> <20040820193547.GZ30151@darkness.comp.waw.pl> <20040820223446.GA18838@panzer.kdm.org> <20040821080614.GC30151@darkness.comp.waw.pl> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="ZMT28BdW279F9lxY" Content-Disposition: inline In-Reply-To: <20040821080614.GC30151@darkness.comp.waw.pl> User-Agent: Mutt/1.4.2i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 5.2.1-RC2 i386 cc: Greg 'groggy' Lehey cc: Wilko Bulte cc: Poul-Henning Kamp cc: freebsd-performance@FreeBSD.org Subject: Re: RAID-3? (was: cvs commit: src MAINTAINERS) X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Aug 2004 08:45:28 -0000 --ZMT28BdW279F9lxY Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Aug 21, 2004 at 10:06:14AM +0200, Pawel Jakub Dawidek wrote: +> Here are already presented results of full RAID3: +>=20 +> RAID3: +> Number of Bytes per Requests per +> Operations processes second second +> ---------------------------------------------------------------------- +> READ 3 6329500 95 +> READ 15 8981047 135 +> READ 100 10719314 161 [...] Whoa! I hacked RAID3 to do something like this while reading (for 3 components): disk0+disk1 disk0+(disk0^disk2) disk1+(disk1^disk2) disk0+disk1 disk0+(disk0^disk2) disk1+(disk1^disk2) [...] And results are really impressive: RAID3 with new reading algorithm: Number of Bytes per Requests per Operations processes second second ---------------------------------------------------------------------- READ 3 8412626 126 READ 15 12083590 181 READ 100 15104488 227 This is more than 40% of speed-up for 100 processes! --=20 Pawel Jakub Dawidek http://www.FreeBSD.org pjd@FreeBSD.org http://garage.freebsd.pl FreeBSD committer Am I Evil? Yes, I Am! --ZMT28BdW279F9lxY Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFBJwumForvXbEpPzQRAmGGAJ43ddkWJL1X6p35MdOurGWVyMGTZgCeJ9Z5 FhTn9CbYdY+6pT4Aall21+c= =JUhx -----END PGP SIGNATURE----- --ZMT28BdW279F9lxY--