From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: Speed variation depending on disk position Date: Tue, 08 May 2007 09:34:12 -0400 Message-ID: <46407C54.7030306@tmr.com> References: <20070505205456.GA17112@tuatara.stupidest.org> <463CF908.6000602@rabbit.us> <463E2EF0.6010408@sauce.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <463E2EF0.6010408@sauce.co.nz> Sender: linux-raid-owner@vger.kernel.org To: Richard Scobie Cc: Linux RAID Mailing List List-Id: linux-raid.ids Richard Scobie wrote: > Peter Rabbitson wrote: > >> 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. > > At least one supplier of terabyte arrays mitigates this effect and > improves seek times, by using 750GB drives and only utilising the > first 500GB. You can do some tuning using partitions this way, assuming you have data which are small, and/or accessed infrequently, and some other data where transfer rate is important. Same idea, but you get to use all of the drive capacity. -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979