From owner-freebsd-hackers Sat Sep 30 20:52:39 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from mail.webmonster.de (datasink.webmonster.de [194.162.162.209]) by hub.freebsd.org (Postfix) with SMTP id 46E9A37B502 for ; Sat, 30 Sep 2000 20:52:37 -0700 (PDT) Received: (qmail 86484 invoked by uid 1000); 1 Oct 2000 03:52:36 -0000 Date: Sun, 1 Oct 2000 05:52:36 +0200 From: "Karsten W. Rohrbach" To: Greg Lehey Cc: Esko Petteri Matinsola , Clark Shishido , hackers@FreeBSD.ORG Subject: Re: Vinum RAID-5 performance problem Message-ID: <20001001055235.G83678@rohrbach.de> Reply-To: karsten@rohrbach.de References: <20000909113319.E5876@wantadilla.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <20000909113319.E5876@wantadilla.lemis.com>; from grog@lemis.com on Sat, Sep 09, 2000 at 11:33:19AM +0930 X-Arbitrary-Number-Of-The-Day: 42 X-Sender: karsten@rohrbach.de Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Greg Lehey(grog@lemis.com)@Sat, Sep 09, 2000 at 11:33:19AM +0930: [...] > depends on what you're trying to do. But yes, having only two > controllers will halve your RAID-5 write performance. Note also that > with a 256 kB stripe, you'll run into drive contention problems > because all your superblocks will be on the same subdisk. Take a size > like 273 kB, for example. or (now proven fact) grog's first guess to solve my config problems: 511k ;-) which ran like a charm on dang big box (32x18.3gig) greg, you should underline that fact in your docs at a prominent location. i think that using a plex size which is even or too small are the most common configuration mistakes the people do... /k -- > If you think sex is a pain in the ass, try a different position. KR433/KR11-RIPE -- http://www.webmonster.de -- ftp://ftp.webmonster.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message