From owner-freebsd-questions@FreeBSD.ORG Mon Jan 18 22:05:03 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 69523106568B for ; Mon, 18 Jan 2010 22:05:03 +0000 (UTC) (envelope-from jmc-freebsd2@milibyte.co.uk) Received: from relay.pcl-ipout02.plus.net (relay.pcl-ipout02.plus.net [212.159.7.100]) by mx1.freebsd.org (Postfix) with ESMTP id F2AE98FC0C for ; Mon, 18 Jan 2010 22:05:02 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApoEABZqVEtUXeby/2dsb2JhbADVRIQzBA Received: from relay01.plus.net ([84.93.230.242]) by relay.pcl-ipout02.plus.net with ESMTP; 18 Jan 2010 22:05:01 +0000 Received: from [84.92.153.232] (helo=curlew.milibyte.co.uk) by relay01.plus.net with esmtp (Exim) id 1NWziW-0003xP-RD; Mon, 18 Jan 2010 22:05:00 +0000 Received: by curlew.milibyte.co.uk with local (Exim 4.71) (envelope-from ) id 1NWziW-00011A-IB; Mon, 18 Jan 2010 22:05:00 +0000 From: Mike Clarke To: freebsd-questions@freebsd.org Date: Mon, 18 Jan 2010 22:05:00 +0000 User-Agent: KMail/1.9.10 References: <201001152334.52978.jmc-freebsd2@milibyte.co.uk> <201001172122.15128.jmc-freebsd2@milibyte.co.uk> <4B538459.7090601@infracaninophile.co.uk> In-Reply-To: <4B538459.7090601@infracaninophile.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Message-Id: <201001182205.00543.jmc-freebsd2@milibyte.co.uk> X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: jmc-freebsd2@milibyte.co.uk X-SA-Exim-Scanned: No (on curlew.milibyte.co.uk); SAEximRunCond expanded to false X-Plusnet-Relay: 0362a14babae4163dd05512ac0f12329 Cc: Pieter de Goeje Subject: Re: Newbie gmirror questions X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jan 2010 22:05:03 -0000 On Sunday 17 January 2010, Matthew Seaman wrote: > However, one of the really amazingly brilliant things about geom is > that just about any disk / storage related thing can be a geom > provider, and geom constructs will nest very happily. =A0Here's a howto > for setting up gmirror across a pair of slices: > > http://people.freebsd.org/~rse/mirror/ That's a very interesting article. Since I'll be able to configure the=20 mirror on the new drives before installing any software my approach can=20 be a bit simpler. In the example he's using a single partition for the whole disk but=20 reduces the size if the partition by one block so that the mirror's=20 meta data doesn't get misinterpreted as whole disk meta data. Since I=20 anticipate using only the first 2 partitions for a couple of mirrors=20 and using the rest of the disk as plain partitions then I don't think I=20 need to do this but might it still be a good idea to reduce the last=20 partition by one block anyway in case my usage changes in the future? =2D-=20 Mike Clarke