From owner-freebsd-performance@FreeBSD.ORG Thu Feb 12 11:57:16 2009 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 461AF1065676 for ; Thu, 12 Feb 2009 11:57:16 +0000 (UTC) (envelope-from richardtector@thekeelecentre.com) Received: from mx0.thekeelecentre.com (mx0.thekeelecentre.com [IPv6:2001:470:1f09:16f:2::3]) by mx1.freebsd.org (Postfix) with ESMTP id F2E428FC18 for ; Thu, 12 Feb 2009 11:57:15 +0000 (UTC) (envelope-from richardtector@thekeelecentre.com) Received: from localhost (filter.mx0.thekeelecentre.com [217.206.238.165]) by mx0.thekeelecentre.com (Postfix) with ESMTP id F3CD64515D; Thu, 12 Feb 2009 11:57:14 +0000 (GMT) X-Virus-Scanned: amavisd-new at thekeelecentre.com Received: from mx0.thekeelecentre.com ([217.206.238.167]) by localhost (filter.mx0.thekeelecentre.com [217.206.238.165]) (amavisd-new, port 10024) with ESMTP id V+pzzjrm-Tk9; Thu, 12 Feb 2009 11:57:12 +0000 (UTC) Received: from [10.0.2.50] (daffy.tector.org.uk [82.71.32.9]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx0.thekeelecentre.com (Postfix) with ESMTPSA id 5060F45142; Thu, 12 Feb 2009 11:57:11 +0000 (GMT) Message-ID: <49940E8E.1080107@thekeelecentre.com> Date: Thu, 12 Feb 2009 11:57:02 +0000 From: Richard Tector User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 To: Bradley Radjoo References: <89D2AE9E4EAAB34FABDBF2913867C62F1CB4B133@ZABRYSVISEX04.af.didata.local> In-Reply-To: <89D2AE9E4EAAB34FABDBF2913867C62F1CB4B133@ZABRYSVISEX04.af.didata.local> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-performance@freebsd.org Subject: Re: Extremely slow write speeds to disk : FreeBSD 7.1 and Dell SAS 6/iR Adapter X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Feb 2009 11:57:16 -0000 Bradley Radjoo wrote: > Greetings, > > Please can you assist. > > I have attempted most of the popular BSD Variants such as NetBSD, Open > BSD, FreeBSD... > The only distrubution that seems to work on the is Dell SAS 6/iR Adapter > is FreeBSD 7.1 > Firmware version & date : 9/29/2008 00.25.47.00 > > But the issue is that writing to disk is extremely slow...i.e. 14Mb per > second.... > > If I install any other linux distribution, like CentOS, write speek is > the way it should be..it averages around 190Mb+ per second > > I was hoping if it were at all possible for you to assist me in with a > later RAID Controller Driver for the SAS 6/iR Adapter Try: hw.mpt.enable_sata_wc=1 in /boot/loader.conf and reboot. Assuming you are using SATA drives, the write cache is disabled by default. This reenables it. The mpt manpage holds more information. Regards, Richard