From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Sandeen Subject: Re: 3ware 9650 tips Date: Mon, 16 Jul 2007 10:50:34 -0500 Message-ID: <469B93CA.30801@sandeen.net> References: <4697CA4D.6020304@etelos.com> <20070716024115.GJ12413810@sgi.com> <20070716122225.GB31489@sgi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070716122225.GB31489@sgi.com> Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com To: David Chinner Cc: Justin Piszcz , Jon Collette , Joshua Baker-LePain , linux-ide-arrays@lists.math.uh.edu, linux-raid@vger.kernel.org, xfs@oss.sgi.com List-Id: linux-raid.ids David Chinner wrote: > On Mon, Jul 16, 2007 at 12:41:15PM +1000, David Chinner wrote: >> On Fri, Jul 13, 2007 at 03:36:46PM -0400, Justin Piszcz wrote: ... >> If you've got any sort of serious disk array, ext3 is not the filesystem >> to use.... > > To show what the difference is, I used blktrace and Chris Mason's > seekwatcher script on a simple, single threaded dd command on > a 12 disk dm RAID0 stripe: > > # dd if=/dev/zero of=/mnt/scratch/fred bs=1024k count=10k; sync > > http://oss.sgi.com/~dgc/writes/ext3_write.png > http://oss.sgi.com/~dgc/writes/xfs_write.png Were those all with default mkfs & mount options? ext3 in writeback mode might be an interesting comparison too. -Eric