From owner-freebsd-stable@FreeBSD.ORG Sat Feb 10 01:54:04 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id AB24816A402 for ; Sat, 10 Feb 2007 01:54:04 +0000 (UTC) (envelope-from mandrews@bit0.com) Received: from mindcrime.bit0.com (bit0.com [207.246.88.211]) by mx1.freebsd.org (Postfix) with ESMTP id 70FE913C441 for ; Sat, 10 Feb 2007 01:54:04 +0000 (UTC) (envelope-from mandrews@bit0.com) Received: from [172.27.1.254] (nat.bit0.com [207.246.88.210]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mindcrime.bit0.com (Postfix) with ESMTP id 579BD730002 for ; Fri, 9 Feb 2007 20:54:03 -0500 (EST) Message-ID: <45CD2551.2070206@bit0.com> Date: Fri, 09 Feb 2007 20:52:17 -0500 From: Mike Andrews User-Agent: Thunderbird 1.5.0.9 (Windows/20061207) MIME-Version: 1.0 To: freebsd-stable@freebsd.org References: <00ad01c74b65$79db1710$0c00a8c0@Artem> <45CC72D4.9040104@lxnt.info> <01e601c74c5d$31be19c0$0c00a8c0@Artem> <200702091441.39848.josh@tcbug.org> In-Reply-To: <200702091441.39848.josh@tcbug.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: What is a good choice of sata-ii raid controller for freebsd? 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: Sat, 10 Feb 2007 01:54:04 -0000 Josh Paetzel wrote: > What hardware RAID buys you over gmirror is that you can boot from it. [snip] > From a raw speed perspective on an unloaded CPU a 3.0ghz processor is > probably just as fast or faster than the embedded processor on a RAID > card running at a few hundred mhz. Sure, once you start talking > about CPUs at full load there are advantages to off-loading stuff to > a dedicated processor. What hardware RAID buys me over gmirror is that SATA2 NCQ actually works on recent hardware RAID cards, and doesn't on gmirror -- at least according to the ata(4) manpage on 6.2-RELEASE. Depending on your specific application, that could have a performance impact, no? -- Mike Andrews * mandrews@bit0.com * http://www.bit0.com It's not news, it's Fark.com. Carpe cavy!