From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with archive (Exim 4.43) id 1FNvPH-0008Rj-C2 for mharc-grub-devel@gnu.org; Mon, 27 Mar 2006 12:21:31 -0500 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1FLz2K-0006nH-Bm for grub-devel@gnu.org; Wed, 22 Mar 2006 03:49:48 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1FLz2I-0006n5-JK for grub-devel@gnu.org; Wed, 22 Mar 2006 03:49:47 -0500 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1FLz2I-0006n2-DD for grub-devel@gnu.org; Wed, 22 Mar 2006 03:49:46 -0500 Received: from [194.109.24.24] (helo=smtp-vbr4.xs4all.nl) by monty-python.gnu.org with esmtp (Exim 4.52) id 1FLz2O-0004uz-2v for grub-devel@gnu.org; Wed, 22 Mar 2006 03:49:52 -0500 Received: from localhost.localdomain (249-174.surfsnel.dsl.internl.net [145.99.174.249]) by smtp-vbr4.xs4all.nl (8.13.3/8.13.3) with ESMTP id k2M8nUi4088385 for ; Wed, 22 Mar 2006 09:49:30 +0100 (CET) (envelope-from mgerards@xs4all.nl) Mail-Copies-To: mgerards@xs4all.nl To: The development of GRUB 2 References: <44209DCE.4070208@personnelware.com> From: Marco Gerards Date: Wed, 22 Mar 2006 09:49:50 +0100 In-Reply-To: <44209DCE.4070208@personnelware.com> (Carl Karsten's message of "Tue, 21 Mar 2006 18:43:58 -0600") Message-ID: <87d5gelv81.fsf@xs4all.nl> User-Agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Virus-Scanned: by XS4ALL Virus Scanner Subject: Re: software raid1 X-BeenThere: grub-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: The development of GRUB 2 List-Id: The development of GRUB 2 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Mar 2006 08:49:48 -0000 Carl Karsten writes: > I have been messing around with software raid1 - mirroring 2 drives - > including the boot sectors. The goal is to be able to remove either > drive and still have a functioning system. > > I realize that this is "not supported" given that "Add support for > software RAID" is on the http://grub.enbug.org/TodoList but I have > heard it can be done with some trickery: install grub on both drives > and rely on the fact that /dev/hda1 and /dev/hda2 and /dev/md0 are all > "the same thing" as long as md0 is the only one that gets written to. RAID is more than just mirroring. You can have striping, a RAID setup with striping and a parity disk, etc. And besides that, even mirroring can do more advanced stuff. Like speeding up loading of kernels by loading from both disks and being more robust against broken disks. But I do not know if this can be realized. > I did run into one problem: if you have ide master and slave, and you > pull the master, the slave dissapears and the box/bios won't see it so > it won't boot from it. so I am guessing I have to make each drive the > master on a seperate ide bus so that pulling one won't take out the > other. > > Before I spend too much time trying to make this work, anyone know of > a HowTo that outlines this? Just do not use GRUB 2. :) -- Marco