From owner-freebsd-performance@FreeBSD.ORG Fri May 20 10:06:26 2005 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2853516A4CF for ; Fri, 20 May 2005 10:06:26 +0000 (GMT) Received: from multiplay.co.uk (www1.multiplay.co.uk [212.42.16.7]) by mx1.FreeBSD.org (Postfix) with ESMTP id EC45C43DC3 for ; Fri, 20 May 2005 10:06:24 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from stevenp4 ([193.123.241.40]) by multiplay.co.uk (multiplay.co.uk [212.42.16.7]) (MDaemon.PRO.v8.0.2.R) with ESMTP id md50001424122.msg for ; Fri, 20 May 2005 11:01:29 +0100 Message-ID: <06aa01c55d23$7a839750$7f06000a@int.mediasurface.com> From: "Steven Hartland" To: "Martin Nilsson" , "Alexis Yushin" References: <20050520031332.GA98548@virgin.ww.net> <428D74E6.4010203@gneto.com> Date: Fri, 20 May 2005 11:05:34 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2527 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 X-Spam-Processed: multiplay.co.uk, Fri, 20 May 2005 11:01:29 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 193.123.241.40 X-Return-Path: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-performance@freebsd.org X-MDAV-Processed: multiplay.co.uk, Fri, 20 May 2005 11:01:31 +0100 cc: freebsd-performance@freebsd.org Subject: Re: Bad 3ware 9000 performance 5.4? X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 May 2005 10:06:26 -0000 Also check out the recent thread on RAID performance on this list for additional info on speeding up RAID performance. I was able to increase from: Read: ~50MB/s Write: ~150MB/s to: Read: ~200MB/s Write: ~150MB/s Steve / K ----- Original Message ----- From: "Martin Nilsson" > I have noticed that the MegaRAID SATA cards sometimes disables the write > cache on Seagate SATA drives, resulting in a write performance of about > 6MB/s. Can you check if the 3ware also does this. I have had arrays were > only one disk had write cache disabled and it totally ruined the > performance of the whole array. > > As always be sure to have a good UPS if you are using write cache on the > disks! With the sad state of todays ATA/SATA disks turning of write > caching in the drive is often not an option. ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.