From owner-freebsd-questions@FreeBSD.ORG Fri Jan 23 21:52:39 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4E80816A4CE for ; Fri, 23 Jan 2004 21:52:39 -0800 (PST) Received: from m01.ca.astound.net (m01.ca.astound.net [64.85.239.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id 65F7C43D48 for ; Fri, 23 Jan 2004 21:52:38 -0800 (PST) (envelope-from rchopra@cal.berkeley.edu) Received: from cal.berkeley.edu (astound-64-85-244-72.ca.astound.net [64.85.244.72]) by m01.ca.astound.net (8.12.10/8.12.10) with ESMTP id i0O5pjjo020712 for ; Fri, 23 Jan 2004 21:51:45 -0800 Message-ID: <401207EF.7030005@cal.berkeley.edu> Date: Fri, 23 Jan 2004 21:51:43 -0800 From: Rishi Chopra User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.6b) Gecko/20031205 Thunderbird/0.4 X-Accept-Language: en-us, en MIME-Version: 1.0 To: questions@freebsd.org Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new Subject: Adaptec 2400A Performance X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Jan 2004 05:52:39 -0000 I've run some imperical tests on the Adaptec 2400A raid controller (results and setup can be seen here): http://www.ocf.berkeley.edu/~rchopra/RaidResults.html I was rather disappointed with the results. Can anyone suggest what might be causing such slow disk speeds, or whether these speeds are out of the ordinary for a 4-disk FreeBSD RAID5 installation? I have done nothing to configure the card aside from striping the array in BIOS; FreeBSD seems to automatically detect the disks. I once ran a 2-disk RAID-0 installation on Win2k which was 6-7 times faster on sequential read/write tests (60-70MB/sec), hence my dismay. -- Rishi Chopra http://www.ocf.berkeley.edu/~rchopra