From owner-freebsd-fs@FreeBSD.ORG Fri Dec 14 12:13:43 2007 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0857E16A417 for ; Fri, 14 Dec 2007 12:13:43 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (tim.des.no [194.63.250.121]) by mx1.freebsd.org (Postfix) with ESMTP id C315C13C4CC for ; Fri, 14 Dec 2007 12:13:42 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (localhost [127.0.0.1]) by spam.des.no (Postfix) with ESMTP id 3122120BD for ; Fri, 14 Dec 2007 13:13:34 +0100 (CET) X-Spam-Tests: AWL X-Spam-Learn: disabled X-Spam-Score: -0.1/3.0 X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on tim.des.no Received: from ds4.des.no (des.no [80.203.243.180]) by smtp.des.no (Postfix) with ESMTP id 156D02089 for ; Fri, 14 Dec 2007 13:13:34 +0100 (CET) Received: by ds4.des.no (Postfix, from userid 1001) id E6A098449A; Fri, 14 Dec 2007 13:13:33 +0100 (CET) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: freebsd-fs@freebsd.org References: <20071210201734.GA16012@VARK.MIT.EDU> Date: Fri, 14 Dec 2007 13:13:33 +0100 In-Reply-To: <20071210201734.GA16012@VARK.MIT.EDU> (David Schultz's message of "Mon\, 10 Dec 2007 15\:17\:34 -0500") Message-ID: <864pelzd76.fsf@ds4.des.no> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: RAID 1 via ataraid(4) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Dec 2007 12:13:43 -0000 David Schultz writes: > I'm looking at getting a new box and wondering what people's > experiences are with mirroring via ataraid(4) and various > motherboards. Does it work? Yes, it works, but GEOM works better (unless you want to stripe the disk you boot from) > At the moment I'm using gmirror (previously ccd until GEOM came > along and ccd became unstable) with a dedicated unmirrored OS > disk. But in accordance with Murphy's law, I've had the boot disk > fail twice in the past five years, so I'd like to put the damn > root fs on the mirror. Just gmirror the boot disk, and make sure gmirror is either compiled into the kernel or loaded at boot time (gmirror_load=3D"YES" in /boot/loader.conf). You don't need BIOS support to boot from a mirror set, unless the primary fails badly enoush that you can't boot from it but not so badly that the BIOS will ignore it. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no