Date: Sat, 21 Aug 2004 18:02:07 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-performance@FreeBSD.org Subject: Re: RAID-3? (was: cvs commit: src MAINTAINERS) Message-ID: <20040821083207.GG92256@wantadilla.lemis.com> 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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--4Epv4kl9IRBfg3rk Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Saturday, 21 August 2004 at 10:06:14 +0200, Pawel Jakub Dawidek wrote: > So as you can see there are no difference in reading (actually > reading in degraded mode is even a bit faster, hard to say why). I would have half expected this. If you're reading parity as well, then without spindle sync it will take longer for three I/Os to complete than 2. In a fractionally different context, I describe a similar result for RAID-5 at http://www.vinumvm.org/vinum/implementation.html. Greg -- Note: I discard all HTML mail unseen. Finger grog@FreeBSD.org for PGP public key. See complete headers for address and phone numbers. --4Epv4kl9IRBfg3rk Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQFBJwiHIubykFB6QiMRAkwxAJ90n7MuEA+YyNHlddScx5gMk+fHZwCff9Fv ncYnhdxFXB/A8na2ocfGeVY= =H0xY -----END PGP SIGNATURE----- --4Epv4kl9IRBfg3rk--
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