From owner-freebsd-scsi@FreeBSD.ORG Wed Jul 2 22:45:38 2003 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A8F7B37B401 for ; Wed, 2 Jul 2003 22:45:38 -0700 (PDT) Received: from postoffice.e-easy.com.au (eth0.lnk.e-easy.com.au [203.31.73.253]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1910E43FCB for ; Wed, 2 Jul 2003 22:45:37 -0700 (PDT) (envelope-from nigel@e-easy.com.au) Received: from postoffice.aims.com.au (nts-ts1.aims.private [192.168.10.2]) by postoffice.e-easy.com.au with ESMTP id h635jWH0005048 for ; Thu, 3 Jul 2003 15:45:32 +1000 (EST) (envelope-from nigel@e-easy.com.au) Received: from ntsts1 by aims.com.au (MDaemon.PRO.v6.8.4.R) with ESMTP id 41-md50000000013.tmp for ; Thu, 03 Jul 2003 15:45:28 +1000 From: "Nigel Weeks" To: Date: Thu, 3 Jul 2003 15:45:27 +1000 Message-ID: <002301c34126$4ee04870$020aa8c0@aims.private> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 1 (Highest) X-MSMail-Priority: High X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4925.2800 Importance: High X-Spam-Processed: aims.com.au, Thu, 03 Jul 2003 15:45:28 +1000 (not processed: spam filter disabled) X-Return-Path: nigel@e-easy.com.au X-MDaemon-Deliver-To: freebsd-scsi@freebsd.org X-Virus-Scanned: by amavisd-milter (http://amavis.org/) X-Spam-Status: No, hits=-0.7 required=4.6 tests=AWL,BAYES_20,X_MSMAIL_PRIORITY_HIGH,X_PRIORITY_HIGH version=2.55 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) Subject: Mylex RAID Performance X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Jul 2003 05:45:38 -0000 Has anyone got more than about 5MB/sec out of a Mylex DAC960PD? I have two striped 7200RPM 68-pin wide ultra drives on a channel (each channel supposed to handle 40MB/sec) Having one drive on each channel made no difference. Running the following command resulted in 5MB/sec maximum throughput dd if=/dev/zero of=/u1/hog bs=1024 count=5000 I tried this of block sizes (bs parameter) of 1024, 2048, 4096, 8192, 16000, and 32000 Any ideas? Nige. -------------------------------------------------------- Nigel Weeks E-Easy 15 Wellington St. Launceston Tas 7250 Ph. 61 3 6334 6664 Fax. 61 3 6331 7032 Email. nigel@e-easy.com.au Web: www.e-easy.com.au --------------------------------------------------------