From owner-freebsd-current@FreeBSD.ORG Thu Jun 24 14:00:49 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 02F9E16A4CE for ; Thu, 24 Jun 2004 14:00:49 +0000 (GMT) Received: from spider.deepcore.dk (cpe.atm2-0-53484.0x50a6c9a6.abnxx9.customer.tele.dk [80.166.201.166]) by mx1.FreeBSD.org (Postfix) with ESMTP id EBAED43D2D for ; Thu, 24 Jun 2004 14:00:44 +0000 (GMT) (envelope-from sos@DeepCore.dk) Received: from DeepCore.dk (sos.deepcore.dk [194.192.25.130]) by spider.deepcore.dk (8.12.11/8.12.10) with ESMTP id i5OE0AVm090780; Thu, 24 Jun 2004 16:00:17 +0200 (CEST) (envelope-from sos@DeepCore.dk) Message-ID: <40DADE69.30702@DeepCore.dk> Date: Thu, 24 Jun 2004 16:00:09 +0200 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= User-Agent: Mozilla Thunderbird 0.5 (X11/20040329) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Daniel Eriksson References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-mail-scanned: by DeepCore Virus & Spam killer v1.4 cc: 'FreeBSD Current' 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 14:00:49 -0000 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. -- -Søren