From owner-freebsd-current@FreeBSD.ORG Sun Jun 20 18:31:23 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 3DDE31065679 for ; Sun, 20 Jun 2010 18:31:23 +0000 (UTC) (envelope-from prvs=178778d95a=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id C71338FC17 for ; Sun, 20 Jun 2010 18:31:22 +0000 (UTC) X-MDAV-Processed: mail1.multiplay.co.uk, Sun, 20 Jun 2010 19:20:20 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Sun, 20 Jun 2010 19:20:17 +0100 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-5.0 required=6.0 tests=USER_IN_WHITELIST shortcircuit=ham autolearn=disabled version=3.2.5 Received: from r2d2 by mail1.multiplay.co.uk (MDaemon PRO v10.0.4) with ESMTP id md50010618723.msg for ; Sun, 20 Jun 2010 19:20:16 +0100 X-Authenticated-Sender: Killing@multiplay.co.uk X-MDRemoteIP: 188.220.16.48 X-Return-Path: prvs=178778d95a=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-current@freebsd.org Message-ID: <0B4F09B43AE84F24954E3B940FA0ECBB@multiplay.co.uk> From: "Steven Hartland" To: "Scott Long" , "oizs" References: <4C1AB4C0.4020604@freemail.hu> <4C1B3792.9000007@freemail.hu><4C1C0ED9.8090103@freemail.hu> <2F904ED8-BC95-459F-8536-A889ADDA8D31@samsco.org> Date: Sun, 20 Jun 2010 19:20:16 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 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: Sun, 20 Jun 2010 18:31:23 -0000 Does anyone know of a nice how to guide for achieving this? ----- Original Message ----- From: "Scott Long" 2. Partition alignment. If you're using classic MBR slices, everything gets misaligned by 63 sectors, making it impossible for the controller to optimize both reads and writes. If the array is used for secondary storage, simply don't use an MBR scheme. If it's used for primary storage, try using GPT instead and setting up your partitions so that they are aligned to large power-of-2 boundaries. ================================================ 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 +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.