From owner-freebsd-stable@FreeBSD.ORG Wed Jun 1 16:29:16 2005 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 52D0516A41C for ; Wed, 1 Jun 2005 16:29:16 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id F1B5343D1F for ; Wed, 1 Jun 2005 16:29:15 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.13.1/8.13.3) id j51GTE9n055603; Wed, 1 Jun 2005 11:29:14 -0500 (CDT) (envelope-from dan) Date: Wed, 1 Jun 2005 11:29:14 -0500 From: Dan Nelson To: Steven Hartland Message-ID: <20050601162914.GD90259@dan.emsphone.com> References: <006201c56633$5bc48c20$b3db87d4@multiplay.co.uk> <20050531233612.GD20906@tigerfish2.my.domain> <429D0C65.6010308@alumni.rice.edu> <003401c56696$0858c4d0$b3db87d4@multiplay.co.uk> <20050601150754.GE20906@tigerfish2.my.domain> <00b901c566bd$d48f2450$b3db87d4@multiplay.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00b901c566bd$d48f2450$b3db87d4@multiplay.co.uk> X-OS: FreeBSD 5.4-STABLE X-message-flag: Outlook Error User-Agent: Mutt/1.5.9i Cc: freebsd-stable@freebsd.org Subject: Re: good performing SCSI RAID5 ( was: asr ( 2015S ) support in 5.4 amd64? ) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Jun 2005 16:29:16 -0000 In the last episode (Jun 01), Steven Hartland said: > Thanks for that Bruce I'm quite surprised that these numbers are so > low after playing with a cheapo hightech SATA controller which with > the help of the guys on the list I was able to give out 200MB/s I > really would expect the relatively expensive SCSI controllers to do > significantly better especially as they have superior disks attached > ( 10K vs 7k2 ) and not performance which is well below ( 1/2 ) that > expected of a single disk. The faster rpms will get you more concurrent I/Os per second but won't do as much for throughput. My asr 3200S cards got repurposed before I could try them with 5.x, but with the 370F firmware I'm pretty sure I was able to get more than 40MB/sec reads out of them on 4.x with 4-disk RAID5 sets. Since the asr driver needs Giant, try a UP kernel and see if it goes any faster. -- Dan Nelson dnelson@allantgroup.com