From owner-freebsd-hackers@FreeBSD.ORG Sun May 8 21:41:23 2005 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 32CAB16A4E6; Sun, 8 May 2005 21:41:23 +0000 (GMT) Received: from multiplay.co.uk (www1.multiplay.co.uk [212.42.16.7]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4917543D54; Sun, 8 May 2005 21:41:22 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from vader ([212.135.219.179]) by multiplay.co.uk (multiplay.co.uk [212.42.16.7]) (MDaemon.PRO.v8.0.2.R) with ESMTP id md50001393853.msg; Sun, 08 May 2005 22:36:55 +0100 Message-ID: <009d01c55416$91681ba0$b3db87d4@multiplay.co.uk> From: "Steven Hartland" To: "Willem Jan Withagen" References: <069901c54bfd$2967ba40$7f06000a@int.mediasurface.com><427D5AA0.1080609@withagen.nl><002b01c553be$93a5b790$b3db87d4@multiplay.co.uk><427E05D2.2060706@digiware.nl><002b01c553db$5e167340$b3db87d4@multiplay.co.uk> <427E8324.8010905@withagen.nl> Date: Sun, 8 May 2005 22:40:31 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2527 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 X-Spam-Processed: multiplay.co.uk, Sun, 08 May 2005 22:36:55 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 212.135.219.179 X-Return-Path: killing@multiplay.co.uk X-MDAV-Processed: multiplay.co.uk, Sun, 08 May 2005 22:36:55 +0100 cc: freebsd-hackers@freebsd.org cc: willem jan withagen cc: freebsd-current@freebsd.org Subject: Re: Very low disk performance Highpoint 1820a X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 08 May 2005 21:41:23 -0000 ----- Original Message ----- From: "Willem Jan Withagen" > > That is well phrased English for what I was trying to say. I'm glad to see > that it worked for you. And I'm certainly impressed by the numbers... > > This is on a 4 disk RAID5 with one hot spare??? Unfortunately not, we needed the capacity so went for pure RAID5 and considering Im not far away from the machine its easy to just pop a new disk in there when I get the email or hear the raid siren go off ( dam noisy thing :P ). One thing of interest uncovered in my testing was linux's software RAID5 was very good, producing: Write: 269Mb/s Read: 259Mb/s and that vimun had surprising poor results, but this could well be attributed to poor defaults Im not sure. Write: 6Mb/s Read: 23Mb/s All tested with pure RAID5 on 5 disks ( no hot swap ). Checkout the "Very low disk performance on 5.x" thread on: freebsd-performance@freebsd.org Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.