From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: Linux MD RAID 5 Benchmarks Across (3 to 10) 300 Gigabyte Veliciraptors Date: Wed, 11 Jun 2008 16:27:54 -0400 Message-ID: <4850354A.8090503@tmr.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, xfs@oss.sgi.com, Alan Piszcz List-Id: linux-raid.ids 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