Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759298AbYFKUat (ORCPT ); Wed, 11 Jun 2008 16:30:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757190AbYFKU1p (ORCPT ); Wed, 11 Jun 2008 16:27:45 -0400 Received: from mail.tmr.com ([64.65.253.246]:59373 "EHLO gaimboi.tmr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757111AbYFKU1o (ORCPT ); Wed, 11 Jun 2008 16:27:44 -0400 Message-ID: <4850354A.8090503@tmr.com> Date: Wed, 11 Jun 2008 16:27:54 -0400 From: Bill Davidsen Organization: TMR Associates Inc, Schenectady NY User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061105 SeaMonkey/1.0.6 MIME-Version: 1.0 To: Justin Piszcz CC: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, xfs@oss.sgi.com, Alan Piszcz Subject: Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors References: In-Reply-To: Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1308 Lines: 33 Justin Piszcz wrote: > First, the original benchmarks with 6-SATA drives with fixed > formatting, using > right justification and the same decimal point precision throughout: > http://home.comcast.net/~jpiszcz/20080607/raid-benchmarks-decimal-fix-and-right-justified/disks.html > > > Now for for veliciraptors! Ever wonder what kind of speed is possible > with > 3 disk, 4,5,6,7,8,9,10-disk RAID5s? I ran a loop to find out, each run is > executed three times and the average is taken of all three runs per > each RAID5 disk set. > > In short? The 965 no longer does justice with faster drives, a new > chipset > and motherboard are needed. After reading or writing to 4-5 veliciraptors > it saturates the bus/965 chipset. This is very interesting, but a 16GB chunk size bears no relationship to anything I would run in the real world, and I suspect most people are in the same category. -- Bill Davidsen "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/