From owner-freebsd-current@FreeBSD.ORG Thu Jun 24 14:41:07 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E316C16A4D0 for ; Thu, 24 Jun 2004 14:41:07 +0000 (GMT) Received: from anduin.net (anduin.net [212.12.46.226]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5AADC43D41 for ; Thu, 24 Jun 2004 14:41:07 +0000 (GMT) (envelope-from ltning@anduin.net) Received: from mailnull by anduin.net with spam-scanned (Exim 4.34; FreeBSD) id 1BdVP2-0007Rs-Qg for freebsd-current@freebsd.org; Thu, 24 Jun 2004 16:40:47 +0200 Received: from eirik.unicore.no ([213.225.74.166] helo=anduin.net) by anduin.net with esmtp (Exim 4.34; FreeBSD) id 1BdVOh-0007RH-CJ; Thu, 24 Jun 2004 16:40:15 +0200 Message-ID: <40DAE792.1090701@anduin.net> Date: Thu, 24 Jun 2004 16:39:14 +0200 From: Eirik Oeverby User-Agent: Mozilla Thunderbird 0.5 (X11/20040308) X-Accept-Language: en-us, en MIME-Version: 1.0 To: =?ISO-8859-1?Q?S=F8ren_Schmidt?= References: <40DADE69.30702@DeepCore.dk> In-Reply-To: <40DADE69.30702@DeepCore.dk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on anduin.net X-Spam-Status: No, hits=0.0 required=7.5 tests=none autolearn=no version=2.63 X-Spam-Level: cc: 'FreeBSD Current' cc: Daniel Eriksson Subject: Re: Multiple choices for RAID-0, best performance? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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, 24 Jun 2004 14:41:08 -0000 Søren Schmidt wrote: > Daniel Eriksson wrote: > >> Also, will the RAID-0 performance (transfer speed and/or resource >> usage) of >> ataraid be affected a lot depending on what controller is used? For >> example >> would there be any performance difference between ataraid on a >> HPT374-based >> card (such as the Highpoint RocketRAID 454) and one of the new Promise >> cards >> (which we have really good drivers for afaik). > > > Well, I havn't measured the performance diff between HPT and Promise > lately, but I'm pretty sure Promise wins due to much lower command > overhead. > > However in the not to far future this wil change *significantly*. > ataraid is in the learning phase of using the command sequencer in the > Promise (and Marvell) chips which will boost performance by having the > controllers do some of the RAID work (in case of the pdc20621 chips in > can even do HW XOR for RAID5). > > Needless to say that it will only work with ataraid, as this needs > intimate knowledge of the ATA controller workings to be used effectively. Any chance Silicon Image SATA-RAID chipsets will be supported this way? Some of the heftier Tyan (dual) Opteron boards use this chipset.. I hear from various sources that it sucks, but ... Can't give up hope yet, can I? ;) /Eirik