From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932397Ab0EFQXj (ORCPT ); Thu, 6 May 2010 12:23:39 -0400 Received: from mx1.sophos.com ([195.166.81.52]:54338 "EHLO mx1.sophos.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932311Ab0EFQXh convert rfc822-to-8bit (ORCPT ); Thu, 6 May 2010 12:23:37 -0400 From: Tvrtko Ursulin Organization: Sophos Plc To: Mikulas Patocka Subject: Re: Testers needed - Maxtor performance degradation Date: Thu, 6 May 2010 17:23:31 +0100 User-Agent: KMail/1.12.4 (Linux/2.6.33.2; KDE/4.3.5; x86_64; ; ) CC: "linux-kernel@vger.kernel.org" , "dm-devel@redhat.com" , "linux-scsi@vger.kernel.org" References: In-Reply-To: MIME-Version: 1.0 Message-ID: <201005061723.31390.tvrtko.ursulin@sophos.com> X-MIMETrack: Itemize by SMTP Server on Mercury/Servers/Sophos(Release 7.0.3|September 26, 2007) at 06/05/2010 17:23:31, Serialize by Router on Mercury/Servers/Sophos(Release 7.0.3|September 26, 2007) at 06/05/2010 17:23:32, Serialize complete at 06/05/2010 17:23:32 X-TNEFEvaluated: 1 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 06 May 2010 17:15:58 Mikulas Patocka wrote: [snip] > I'd like to ask other people with Maxtor disks to run this script (with > "sda", "sdb", etc. as an argument ... without "/dev/" prefix). The script > measures read rate as a function of request size. Report the results, so > that it can be determined which disks are buggy and which not and the > default transfer size could be reduced to 256kB for the buggy ones. Here is one: MAXTOR ATLAS10K5_073SAS BP00 64 kB: 86.7 MB/s 128 kB: 86.6 MB/s 192 kB: 86.6 MB/s 256 kB: 86.1 MB/s 320 kB: 39.9 MB/s 384 kB: 41.1 MB/s 448 kB: 41.3 MB/s 512 kB: 44.2 MB/s 576 kB: 49.7 MB/s 640 kB: 42.8 MB/s 704 kB: 47.0 MB/s 768 kB: 46.4 MB/s 832 kB: 59.1 MB/s 896 kB: 55.6 MB/s 960 kB: 57.2 MB/s 1024 kB: 59.3 MB/s Sophos Plc, The Pentagon, Abingdon Science Park, Abingdon, OX14 3YP, United Kingdom. Company Reg No 2096520. VAT Reg No GB 348 3873 20.