From owner-freebsd-stable@FreeBSD.ORG Sun Feb 5 11:05:25 2006 Return-Path: X-Original-To: stable@freebsd.org Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4DE2B16A420 for ; Sun, 5 Feb 2006 11:05:25 +0000 (GMT) (envelope-from Philippe.Pegon@crc.u-strasbg.fr) Received: from mailhost.u-strasbg.fr (mailhost.u-strasbg.fr [130.79.200.158]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7187C43D49 for ; Sun, 5 Feb 2006 11:05:24 +0000 (GMT) (envelope-from Philippe.Pegon@crc.u-strasbg.fr) Received: from baal.u-strasbg.fr (baal.u-strasbg.fr [IPv6:2001:660:2402::41]) by mailhost.u-strasbg.fr (8.13.4/jtpda-5.5pre1) with ESMTP id k15B5AvD009259 ; Sun, 5 Feb 2006 12:05:10 +0100 (CET) Received: from [127.0.0.1] (crc.u-strasbg.fr [IPv6:2001:660:2402:1001::1]) by baal.u-strasbg.fr (8.13.4/jtpda-5.5pre1) with ESMTP id k15B59Tu007011 ; Sun, 5 Feb 2006 12:05:10 +0100 Message-ID: <43E5DBD4.8010908@crc.u-strasbg.fr> Date: Sun, 05 Feb 2006 12:04:52 +0100 From: Philippe Pegon User-Agent: Mozilla Thunderbird 1.0.7 (X11/20060128) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ivan Voras References: <43E52A89.4020700@fer.hr> In-Reply-To: <43E52A89.4020700@fer.hr> Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.88/1276/Sat Feb 4 16:29:35 2006 on mr8.u-strasbg.fr X-Virus-Scanned: ClamAV 0.88/1276/Sat Feb 4 16:29:35 2006 on baal.u-strasbg.fr X-Virus-Status: Clean X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0.2 (mailhost.u-strasbg.fr [IPv6:2001:660:2402::158]); Sun, 05 Feb 2006 12:05:10 +0100 (CET) X-Spam-Status: No, score=0.2 required=5.0 tests=AWL,NO_RELAYS autolearn=disabled version=3.1.0 X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on mr8.u-strasbg.fr Cc: stable@freebsd.org Subject: Re: Compaq Proliant CISS slow writes X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 05 Feb 2006 11:05:25 -0000 Ivan Voras wrote: > I need to get a Proliant machine with 2 P3 processors running FreeBSD 6. > I don't know much about the machine, I think it's ML 380 G2 or close to > that, but I have physical access. So far, everything is fine (once the > inability to boot from CD-ROM is circumvented), except one "detail": > horrible write performance on its CISS 5 RAID5 array. I get ~75MB/s > burst (large blocks) reads, and only 5MB/s burst writes. I know how > RAID5 works, but still, this is bad. The machine has been running Linux > before this and performance was Ok - I didn't benchmark it but the > "feeling" when working on it was normal, while on FreeBSD it's noticably > slow in mixed read/write load. > > Is there anything I can try to improve this? In the verbose boot log > there's a line that says the controller supports "simple, performant and > MEMQ" modes, and the one that's used is "simple" - does this have any > influence? If so, how to change it? > > Thanks! do you have write cache on your Smart Array 532 ? I had the same problem last year with a Smart Array 642, this controller is sold without write cache and we needed to buy the couple battery/write cache for it to have good write performance. -- Philippe Pegon