From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Sat, 01 Nov 2008 03:55:53 -0700 (PDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.168.28]) by oss.sgi.com (8.12.11.20060308/8.12.11/SuSE Linux 0.7) with ESMTP id mA1Atdhu029019 for ; Sat, 1 Nov 2008 03:55:40 -0700 Received: from hole.yuiop.co.uk (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id AA4CDB30A15 for ; Sat, 1 Nov 2008 03:55:39 -0700 (PDT) Received: from hole.yuiop.co.uk (hole.yuiop.co.uk [89.145.97.62]) by cuda.sgi.com with ESMTP id 9wKcckLHsPMBlCib for ; Sat, 01 Nov 2008 03:55:39 -0700 (PDT) Message-ID: <490C359F.7080504@anonymous.org.uk> Date: Sat, 01 Nov 2008 10:55:27 +0000 From: John Robinson MIME-Version: 1.0 Subject: Re: Linux RAID & XFS Question - Multiple levels of concurrency = faster I/O on md/RAID 5? References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: Justin Piszcz Cc: linux-raid@vger.kernel.org, xfs@oss.sgi.com On 01/11/2008 08:29, Justin Piszcz wrote: [...] > Why is running 3 jobs con-currently that take care of two parts each > more than > twice as fast than running one job for six parts? Because you have multiple CPUs? Cheers, John.