From owner-freebsd-current@FreeBSD.ORG Fri Jun 18 09:08:53 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 679E51065673 for ; Fri, 18 Jun 2010 09:08:53 +0000 (UTC) (envelope-from oizs@freemail.hu) Received: from fep15.mx.upcmail.net (fep15.mx.upcmail.net [62.179.121.35]) by mx1.freebsd.org (Postfix) with ESMTP id 2DEC78FC23 for ; Fri, 18 Jun 2010 09:08:51 +0000 (UTC) Received: from edge01.upcmail.net ([192.168.13.236]) by viefep15-int.chello.at (InterMail vM.8.01.02.02 201-2260-120-106-20100312) with ESMTP id <20100618090850.TFKH21071.viefep15-int.chello.at@edge01.upcmail.net> for ; Fri, 18 Jun 2010 11:08:50 +0200 Received: from [192.168.0.6] ([213.222.167.104]) by edge01.upcmail.net with edge id XM8p1e01A2FUr7101M8qbb; Fri, 18 Jun 2010 11:08:50 +0200 X-SourceIP: 213.222.167.104 Message-ID: <4C1B3792.9000007@freemail.hu> Date: Fri, 18 Jun 2010 11:08:34 +0200 From: oizs User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.9) Gecko/20100317 Thunderbird/3.0.4 MIME-Version: 1.0 To: freebsd-current@freebsd.org References: <4C1AB4C0.4020604@freemail.hu> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Cloudmark-Analysis: v=1.1 cv=BX1z5e3lS7RAKjOkUI/uDpZ/pP4xz0N/VImyOZX9Sfk= c=1 sm=0 a=q8OS1GolVHwA:10 a=8nJEP1OIZ-IA:10 a=nLCNl_PB9N9lMT3I0kAA:9 a=GV9qfeMS4apeHJQobfZXO6qBcEQA:4 a=wPNLvfGTeEIA:10 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 Subject: Re: Dell Perc 5/i Performance issues X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Jun 2010 09:08:53 -0000 I've seen people with the same configuration doing 160MB/s writes and 250MB/s+ reads with raid5 so I still think something isn't right. And using raid10 with 4 disks is a rather large waste of capacity. -zsozso On 2010.06.18. 1:55, Chuck Swiger wrote: > On Jun 17, 2010, at 4:50 PM, oizs wrote: > >> I've bought a Dell Perc 5/i because I couldn't make the onboard marvell 88sx7042 work with 8.0/8.1 or current, but as lucky as I am, the best I can do with 4x1.5tb samsung in raid5 is 60MB/s writes and 90MB/s reads, with bbu/write-back/adaptive-read-ahead. >> >> I was expecting at least twice of that, and I'm not sure what can I do to get that speed. (I've read man 7 tuning with no success) >> > Switch to using RAID-10 rather than RAID-5. It's normal for RAID-5 to have worse write performance than that of a single drive. > > Regards, >