From owner-freebsd-questions Sat Mar 18 18:25:33 2000 Delivered-To: freebsd-questions@freebsd.org Received: from beta.tricity.wsu.edu (beta.tricity.wsu.edu [192.31.216.9]) by hub.freebsd.org (Postfix) with ESMTP id 45F7B37B562 for ; Sat, 18 Mar 2000 18:25:29 -0800 (PST) (envelope-from msmith@beta.tricity.wsu.edu) Received: (from msmith@localhost) by beta.tricity.wsu.edu (8.9.3/8.9.3) id SAA22741; Sat, 18 Mar 2000 18:25:20 -0800 From: Mark Smith Message-Id: <200003190225.SAA22741@beta.tricity.wsu.edu> Subject: Re: vinum stats and question(addendum) To: fbsddave@mrcaffeine.com (fbsd-dave) Date: Sat, 18 Mar 2000 18:25:20 -0800 (PST) Cc: freebsd-questions@FreeBSD.ORG In-Reply-To: from "fbsd-dave" at Mar 18, 2000 06:54:48 AM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG I forgot, My system specs. Pentium 233mhz MMX 128MB RAM Adaptec AIC 7880 chip on the mboard Fujitsu 9.1G UW /dev/da1 IBM/DEC 9.1G UW /dev/da2 OK, I'll play with "oddball" stripe sizes. Thanks! > "b"? I would guess all your writes are walking on each other. And with > power-of-two stripe sizes all your superblocks will be on one drive. > That's a slow combination. Try some tests again but starting at 128k, and > try, for instance, 129k to see what it does. Greg is working on a program > to figure ideal sizes so one day that'll be easier. Also, I notice your > processor is mostly maxed. I think it's spending itself on the small > stripe transactions. A faster processor could help but that would be the > wrong fix IMO. > > The usual stuff about alternating drives between channels holds here, too. > With a 4 drive stripe, I've seen better than 50% improvements from putting > drives a/c on one channel and b/d on another vs. a/b and c/d. I'd guess > your tiny stripe sizes would especially benefit from multiple channels but > I haven't tested anything that small. > > Let us know! Now I'm curious! :) > > Dave Mark -- ========================================================================= UNIX IS user friendly, it's just very choosy about who it calls a friend! ========================================================================= To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message