From owner-freebsd-current@FreeBSD.ORG Thu Jun 17 23:55:32 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 BF89B1065674 for ; Thu, 17 Jun 2010 23:55:32 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout024.mac.com (asmtpout024.mac.com [17.148.16.99]) by mx1.freebsd.org (Postfix) with ESMTP id A891F8FC1F for ; Thu, 17 Jun 2010 23:55:32 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=us-ascii Received: from cswiger1.apple.com ([17.209.4.71]) by asmtp024.mac.com (Sun Java(tm) System Messaging Server 6.3-8.01 (built Dec 16 2008; 32bit)) with ESMTPSA id <0L4600C70NSJBU50@asmtp024.mac.com> for freebsd-current@freebsd.org; Thu, 17 Jun 2010 16:55:32 -0700 (PDT) X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx engine=6.0.2-1004200000 definitions=main-1006170150 X-Proofpoint-Virus-Version: vendor=fsecure engine=1.12.8161:2.4.5,1.2.40,4.0.166 definitions=2010-06-17_03:2010-02-06, 2010-06-17, 2010-06-17 signatures=0 From: Chuck Swiger In-reply-to: <4C1AB4C0.4020604@freemail.hu> Date: Thu, 17 Jun 2010 16:55:31 -0700 Message-id: References: <4C1AB4C0.4020604@freemail.hu> To: oizs X-Mailer: Apple Mail (2.1081) Cc: freebsd-current@freebsd.org 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: Thu, 17 Jun 2010 23:55:32 -0000 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, -- -Chuck