From owner-freebsd-performance@FreeBSD.ORG Thu Feb 12 14:43:22 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 7F9161065677 for ; Thu, 12 Feb 2009 14:43:22 +0000 (UTC) (envelope-from Bradley.Radjoo@is.co.za) Received: from phobytor.is.co.za (phobytor.is.co.za [196.4.160.171]) by mx1.freebsd.org (Postfix) with ESMTP id 0DC6C8FC15 for ; Thu, 12 Feb 2009 14:43:21 +0000 (UTC) (envelope-from Bradley.Radjoo@is.co.za) Received: from phobytor.is.co.za (localhost [127.0.0.1]) by phobytor.is.co.za (Postfix) with ESMTP id 6B84A3BC70A for ; Thu, 12 Feb 2009 16:43:20 +0200 (SAST) Received: from ZABRYSVISMFW (zajnbisit.mfw.is.co.za [196.26.2.106]) by phobytor.is.co.za (Postfix) with ESMTP id 3A2023BC700 for ; Thu, 12 Feb 2009 16:43:20 +0200 (SAST) Received: from zabrysvisex06.af.didata.local (Not Verified[10.1.8.16]) by ZABRYSVISMFW with MailMarshal (v6, 1, 8, 2172) id ; Thu, 12 Feb 2009 16:41:09 +0200 Received: from ZABRYSVISEX04.af.didata.local ([10.1.8.149]) by zabrysvisex06.af.didata.local with Microsoft SMTPSVC(6.0.3790.3959); Thu, 12 Feb 2009 16:43:20 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Thu, 12 Feb 2009 16:43:15 +0200 Message-ID: <89D2AE9E4EAAB34FABDBF2913867C62F1CBB66F5@ZABRYSVISEX04.af.didata.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Extremely slow write speeds to disk : FreeBSD 7.1 and Dell SAS 6/iR Adapter Thread-Index: AcmNCQ9AXXxMaQxsTUGwG66FANBUPQAFravw References: <89D2AE9E4EAAB34FABDBF2913867C62F1CB4B133@ZABRYSVISEX04.af.didata.local> <49940E8E.1080107@thekeelecentre.com> From: "Bradley Radjoo" To: X-OriginalArrivalTime: 12 Feb 2009 14:43:20.0271 (UTC) FILETIME=[3FA04DF0:01C98D20] X-Virus-Scanned: ClamAV using ClamSMTP 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 14:43:23 -0000 Thanks very much Richard, (They are 2 X 73Gig Ultra 320 scsi SAS drives) BUT seems that even with the UP kernel, I still get issues.. This is what I see in dmesg : mpt0: port 0xec00-0xecff mem 0xdfcec000-0xdfceffff,0xdfcf0000-0xdfcfffff irq 15 at device 0.0 on pci5 mpt0: [ITHREAD] mpt0: MPI Version=3D1.5.18.0 mpt0: mpt_wait_req(6) timed out mpt0: port 0 enable timed out mpt0: failed to enable port 0 mpt0: unable to initialize IOC da0 at mpt0 bus 0 target 0 lun 0 ses0 at mpt0 bus 0 target 8 lun 0 Please can you assist and advise=20 -----Original Message----- From: Richard Tector [mailto:richardtector@thekeelecentre.com]=20 Sent: 12 February 2009 01:57 PM To: Bradley Radjoo Cc: freebsd-performance@freebsd.org Subject: Re: Extremely slow write speeds to disk : FreeBSD 7.1 and Dell SAS 6/iR Adapter Bradley Radjoo wrote: > Greetings, >=20 > Please can you assist. >=20 > 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 >=20 > But the issue is that writing to disk is extremely slow...i.e. 14Mb per > second.... >=20 > If I install any other linux distribution, like CentOS, write speek is > the way it should be..it averages around 190Mb+ per second >=20 > 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=3D1 in /boot/loader.conf and reboot. Assuming you are using SATA drives, the write cache is disabled by=20 default. This reenables it. The mpt manpage holds more information. Regards, Richard Please note: This email and its content are subject to the disclaimer as = displayed at the following link http://www.is.co.za/legal/E-mail+Confiden= tiality+Notice+and+Disclaimer.htm. Should you not have Web access, send a= =20mail to disclaimers@is.co.za and a copy will be emailed to you.