From owner-freebsd-scsi@FreeBSD.ORG Thu Nov 13 07:24:52 2003 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 88DA616A4CE for ; Thu, 13 Nov 2003 07:24:52 -0800 (PST) Received: from mail.webjockey.net (mail.webjockey.net [208.141.46.3]) by mx1.FreeBSD.org (Postfix) with ESMTP id B555D43FDF for ; Thu, 13 Nov 2003 07:24:50 -0800 (PST) (envelope-from gary@outloud.org) Received: from trident-bl1rb74.outloud.org (69-160-77-240.frdrmd.adelphia.net [69.160.77.240]) by mail.webjockey.net (8.12.9/8.12.8) with ESMTP id hADFQVRG089513; Thu, 13 Nov 2003 10:26:32 -0500 (EST) (envelope-from gary@outloud.org) Message-Id: <6.0.0.22.2.20031113101928.02b407b8@localhost> X-Sender: ancient/208.141.46.254@localhost X-Mailer: QUALCOMM Windows Eudora Version 6.0.0.22 Date: Thu, 13 Nov 2003 10:24:51 -0500 To: Allen Briggs From: Gary Stanley In-Reply-To: <20031113132327.GF13029@canolog.ninthwonder.com> References: <20031112172306.J4572@pooker.samsco.home> <20031113084355.P13503@cvs.imp.ch> <6.0.0.22.2.20031113062949.028fbea0@localhost> <20031113132327.GF13029@canolog.ninthwonder.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed cc: freebsd-scsi@freebsd.org Subject: Re: Very bad FreeBSD SCSI RAID5 write speed performance X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Nov 2003 15:24:52 -0000 Yeah, It was early in the morning, I was doing a bunch of IOS upgrades most of the night. :) >dd if=/dev/zero of=./test bs=128k count=2000 2000+0 records in 2000+0 records out 262144000 bytes transferred in 18.012217 secs (14553678 bytes/sec) Not bad. That's what I'm expecting. :) At 08:23 AM 11/13/2003, you wrote: >On Thu, Nov 13, 2003 at 06:38:53AM -0500, Gary Stanley wrote: > > root@64:[/tmp/blah]>dd if=/dev/zero of=/tmp/blah/blah > > 89472+0 records in > > 89471+0 records out > > 45809152 bytes transferred in 8.546312 secs (5360108 bytes/sec) > >I suspect you know this, but if you give a larger block size (bs=...), >you should see better performance. Writing to a file on the filesystem >not only brings up the softupdates question, but also your choices for >block and fragment sizes. On a RAID, there's also the question of >stripe size and how that's set with respect to the filesystem block >and fragment sizes. > >-allen > >-- > Allen Briggs briggs@wasabisystems.com > Wasabi Systems, Inc. http://www.wasabisystems.com/