Date: Sat, 21 Aug 2004 10:45:26 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "Kenneth D. Merry" <ken@kdm.org> Cc: freebsd-performance@FreeBSD.org Subject: Re: RAID-3? (was: cvs commit: src MAINTAINERS) Message-ID: <20040821084526.GF30151@darkness.comp.waw.pl> In-Reply-To: <20040821080614.GC30151@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>
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--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--
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