From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Rabbitson Subject: Speed variation depending on disk position (was: Linux SW RAID: HW Raid Controller/JBOD vs. Multiple PCI-e Cards?) Date: Sat, 05 May 2007 23:37:12 +0200 Message-ID: <463CF908.6000602@rabbit.us> References: <20070505205456.GA17112@tuatara.stupidest.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070505205456.GA17112@tuatara.stupidest.org> Sender: linux-raid-owner@vger.kernel.org Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Chris Wedgwood wrote: > > > Also, 'dd performance' varies between the start of a disk and the end. > Typically you get better performance at the start of the disk so dd > might not be a very good benchmark here. > Hi, Sorry for hijacking this thread, but I was actually planning to ask this very same question. Is the behavior you are describing above manufacturer dependent or it is pretty much dictated by the general design of modern drives? I have an array of 4 Maxtor sata drives, and raw read performance at the end of the disk is 38mb/s compared to 62mb/s at the beginning. Thanks