From owner-freebsd-performance@FreeBSD.ORG Sat Feb 14 07:58:13 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 E3DA1106566C for ; Sat, 14 Feb 2009 07:58:13 +0000 (UTC) (envelope-from sebster@sebster.com) Received: from mail.sebster.com (mail.sebster.com [193.46.80.82]) by mx1.freebsd.org (Postfix) with SMTP id 433CC8FC1E for ; Sat, 14 Feb 2009 07:58:12 +0000 (UTC) (envelope-from sebster@sebster.com) Received: (qmail 39705 invoked from network); 14 Feb 2009 07:58:11 -0000 Received: from unknown (HELO ?10.0.1.6?) (sebster@85.147.225.232) by mail.sebster.com with SMTP; 14 Feb 2009 07:58:10 -0000 Message-ID: <499672F1.4060109@sebster.com> Date: Sat, 14 Feb 2009 08:29:53 +0100 From: Sebastiaan van Erk User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: Dieter References: <200902210616.GAA14352@sopwith.solgatos.com> In-Reply-To: <200902210616.GAA14352@sopwith.solgatos.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms090808020805040708000804" 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: Sat, 14 Feb 2009 07:58:14 -0000 This is a cryptographically signed message in MIME format. --------------ms090808020805040708000804 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Dieter wrote: >>> 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. >> > > Just keep in mind that turning the disk's write cache on puts your > data at risk. :-( > > The correct solution is NCQ. Just wondering, if you have a battery on your RAID array, is this a problem? Wouldn't the cache get written anyway in case of a crash? 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