From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Thu, 28 Jun 2007 00:54:03 -0700 (PDT) Received: from mail.ukfsn.org (s2.ukfsn.org [217.158.120.143]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id l5S7rutL012944 for ; Thu, 28 Jun 2007 00:53:58 -0700 Message-ID: <46836912.4000508@dgreaves.com> Date: Thu, 28 Jun 2007 08:53:54 +0100 From: David Greaves MIME-Version: 1.0 Subject: Re: Fastest Chunk Size w/XFS For MD Software RAID = 1024k References: <20070628050837.GG989688@sgi.com> In-Reply-To: <20070628050837.GG989688@sgi.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: David Chinner Cc: Justin Piszcz , linux-raid@vger.kernel.org, xfs@oss.sgi.com, Alan Piszcz David Chinner wrote: > On Wed, Jun 27, 2007 at 07:20:42PM -0400, Justin Piszcz wrote: >> For drives with 16MB of cache (in this case, raptors). > > That's four (4) drives, right? I'm pretty sure he's using 10 - email a few days back... >>>>>> Justin Piszcz wrote: >>>>> Running test with 10 RAPTOR 150 hard drives, expect it to take >>>>> awhile until I get the results, avg them etc. :) > If so, how do you get a block read rate of 578MB/s from > 4 drives? That's 145MB/s per drive.... Which gives a far more reasonable 60MB/s per drive... David