From owner-freebsd-questions@FreeBSD.ORG Fri Jul 11 21:18:01 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id F0D66CD1 for ; Fri, 11 Jul 2014 21:18:00 +0000 (UTC) Received: from mail-lb0-x229.google.com (mail-lb0-x229.google.com [IPv6:2a00:1450:4010:c04::229]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7761627B5 for ; Fri, 11 Jul 2014 21:18:00 +0000 (UTC) Received: by mail-lb0-f169.google.com with SMTP id l4so1333384lbv.28 for ; Fri, 11 Jul 2014 14:17:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=eGvh7qLXqjL7fMIcz6u0zru7Jr5cxhpJQUmEjcpw4Hg=; b=Yt0oysqs5kpgHbh8kB3dpzh7uUrfLrGRpZUKblGquqokzn6CXwB1zZ/8pepMY7A1IM 0zDc5IXpcfz6C1w/1M02qcqcVx+yJCetrsvpXFRTBOe96voRH3bNqbPaqBMz7/ZZXZ2f kojWzKml+s93v5WRITvEhhk4zaIsbt4tyorPqAJziqeIGGChiLb0QrW09ZPxSAOLJ/wv sM0Xj9xTjjRjwEKCeuQ5EpP4MI0hnWsPUJrDBcAcvWTPSubQUj4l4sKuNHgjbjuzyTev SSB8g/beLj7b4hjM6bKQq5uVMEvxV+WW/JA2wH5P+FrKC5VmGNtodxwRQmN7Bl7HlMNY c4Yw== X-Received: by 10.112.239.41 with SMTP id vp9mr1267907lbc.8.1405113478351; Fri, 11 Jul 2014 14:17:58 -0700 (PDT) Received: from lazlar.no-ip.biz (109.58.149.35.bredband.tre.se. [109.58.149.35]) by mx.google.com with ESMTPSA id d3sm4627052lbw.2.2014.07.11.14.17.57 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 11 Jul 2014 14:17:57 -0700 (PDT) Message-ID: <53C05484.5000406@gmail.com> Date: Fri, 11 Jul 2014 23:17:56 +0200 From: Rolf Nielsen User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: freebsd-questions@freebsd.org Subject: Re: gpart and bsdlabel References: <20140711201114.GA2064@bewilderbeast.blackhelicopters.org> In-Reply-To: <20140711201114.GA2064@bewilderbeast.blackhelicopters.org> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jul 2014 21:18:01 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2014-07-11 22:11, Michael W. Lucas wrote: > Hi, > > I'm gradually switching from the familiar and comfortable agony of > fdisk/disklabel to gpart. > > In the past, our org has avoided certain partition letters on > specific drives. If the drive isn't a boot drive, it has no 'a" > partition. If it has no swap, it has no 'b' partition. > > gpart assigns partition letters in the order in which they're > created. > > Is there a way to specify which partition letter you want to > create, or start with, or something? > > Thanks, ==ml > I just created a 10 GB file backed md device, and did some experiments with gpart. Here's the result. root@lazlar:/misc/cdrecorder/Film # gpart create -s MBR md0 md0 created root@lazlar:/misc/cdrecorder/Film # gpart add -t freebsd md0 md0s1 added root@lazlar:/misc/cdrecorder/Film # gpart create -s BSD md0s1 md0s1 created root@lazlar:/misc/cdrecorder/Film # gpart add -b 16 -s 4G -t freebsd-ufs -i 6 md0s1 md0s1f added root@lazlar:/misc/cdrecorder/Film # gpart add -b 8388624 -t freebsd-swap -i 2 md0s1 md0s1b added root@lazlar:/misc/cdrecorder/Film # bsdlabel md0s1 # /dev/md0s1: 8 partitions: # size offset fstype [fsize bsize bps/cpg] b: 12582816 8388624 swap c: 20971440 0 unused 0 0 # "raw" part, don't edit f: 8388608 16 4.2BSD 0 0 0 It seems the partition letters can be assigned dynamically, using the - -i option to gpart add. Rolf -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJTwFSEAAoJEB1OKfQ0M8TgLNsQAOGyOCjSTnjPYcvAUha+rDUc ixtmuhDubex7Ri2hcg5ThYdkQ23cyliL1b/uppnRU6JAfiucuLYc5yHzxAStZ+ET YdkOyGlwAKCJ7RpT5pGc3cv6xdCqXO1p6MLaZd2UOFoqhKy/jW+eLtpp+6s+FTTj Bhz5V+Sp11GOo5T+HdoTa9ixvLP98uH58h9f8za7Kh8Q/gvB+GL8C7ruxInJGlvs LbyVyOmvozhxbnY/80HpcCUfc4eLlkJ3RzRDwQGsSqAvV0pfczRgmjCbzRHqVkIV ggRDohEzFWXO39VDSaTQpE407ORcuvgPcENgQO9ftI52eCVSv0FgC6kGje4VitDO D4De9IefMk2kppiX2RQ5sVxHWTOa59iTFmjn5HgnoTs2pms1ubyzeZJyWXr97s5j WGI9sDOzXJ9Io2k1J19pXP46DMqn8TqaoC5OK079pBpzvj50+xNXfy0CZ09UFjfY XSLnI3htGV4LEAXrj77rFBZLiRYPuGaesFGxK+Y9U10ecXm2WleYUG0fUqvbv91+ BOsf1uXhp/4aWNtPjW+Cot/hhoop0j8U7B0Z0gKjAqGlsy8uBa+pxwsmPoDyR6Fz F9z95Pl7vLRgvCZa2RSgcsm3JhgpTZVAVl9RtOQuVUQRqlckw0TzpL6PRu0PYara lyCVNp/8JzQt/cJ1TW+3 =viUr -----END PGP SIGNATURE-----