From owner-freebsd-stable@FreeBSD.ORG Tue Apr 1 06:20:01 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EFE7D37B401 for ; Tue, 1 Apr 2003 06:20:01 -0800 (PST) Received: from smtpproxy1.mitre.org (smtpproxy1.mitre.org [192.160.51.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id 08B5543F93 for ; Tue, 1 Apr 2003 06:20:01 -0800 (PST) (envelope-from jandrese@mitre.org) Received: from avsrv1.mitre.org (avsrv1.mitre.org [129.83.20.58]) by smtpproxy1.mitre.org (8.12.9/8.12.8) with ESMTP id h31EJxJS000427; Tue, 1 Apr 2003 09:19:59 -0500 (EST) Received: from MAILHUB1 (mailhub1.mitre.org [129.83.20.31]) by smtpsrv1.mitre.org (8.12.9/8.12.8) with ESMTP id h31EJvCg025291; Tue, 1 Apr 2003 09:19:58 -0500 (EST) Received: from mm112324-2k.mitre.org (128.29.3.65) by mailhub1.mitre.org with SMTP id 1741189; Tue, 01 Apr 2003 09:19:53 -0500 Message-ID: <3E89A006.7020301@mitre.org> Date: Tue, 01 Apr 2003 09:19:50 -0500 From: Jason Andresen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3) Gecko/20030312 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Craig Boston References: <20030330125138.K23911@leelou.in.tern> <3E870CC7.5000204@mac.com> <20030330175605.E23911@leelou.in.tern> <3E87204C.5060304@ludd.luth.se> <3E88524A.1060600@mitre.org> <3E88AECD.10607@liwing.de> <3E88B601.90802@mitre.org> <1049147744.98637.57.camel@owen1492.uf.corelab.com> In-Reply-To: <1049147744.98637.57.camel@owen1492.uf.corelab.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: FreeBSD Stable List Subject: Re: vinum performance X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Apr 2003 14:20:02 -0000 Craig Boston wrote: > On Mon, 2003-03-31 at 15:41, Jason Andresen wrote: > >>(Both of these were on previously untouched files to prevent any >>caching, and the "write" test is on a new file, not rewriting an old one) >>Write speed: >>81920000 bytes transferred in 3.761307 secs (21779663 bytes/sec) >>Read speed: >>81920000 bytes transferred in 3.488978 secs (23479655 bytes/sec) >> >>But on the RAID5: >>Write speed: >>81920000 bytes transferred in 17.651300 secs (4641018 bytes/sec) >>Read speed: >>81920000 bytes transferred in 4.304083 secs (19033090 bytes/sec) > > > Disclaimer: IANAVE (I am not a Vinum Expert) > > What block size are you using with dd? If your bs= is less than your > RAID stripe size, it seems like it would end up doing unnecessary > read-modify-write cycles... Commands used: dd if=/dev/zero of=test bs=8192 count=1000 and dd if=random_unused_file_larger_than_80MB of=/dev/null bs=8192 \ count=10000 My stripe size is 384k. -- \ |_ _|__ __|_ \ __| Jason Andresen jandrese@mitre.org |\/ | | | / _| Network and Distributed Systems Engineer _| _|___| _| _|_\___| Office: 703-883-7755