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Thu, 26 Aug 2021 21:39:23 +0000 Date: Thu, 26 Aug 2021 23:36:13 +0200 From: Javier To: freebsd-questions@freebsd.org Subject: Re: Paritioning scheme on MBR disk doubts Message-ID: In-Reply-To: <20210826203921.0d3537684706867aef1e30f9@sohara.org> References: <20210826203921.0d3537684706867aef1e30f9@sohara.org> X-Mailer: Sylpheed 3.4.3 (GTK+ 2.10.14; i686-pc-mingw32) Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TMN: [ADzT3MA0IdTumWnUjDL3C/j8uGq+4VZr] X-ClientProxiedBy: MR2P264CA0178.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501::17) To MW4PR01MB6401.prod.exchangelabs.com (2603:10b6:303:67::11) X-Microsoft-Original-Message-ID: <20210826233613.18b053a712d36ff0c9a3df38@outlook.es> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (62.57.107.98) by MR2P264CA0178.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501::17) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.20.4457.17 via Frontend Transport; Thu, 26 Aug 2021 21:39:22 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 523a9a2f-649e-4bdc-6a66-08d968d9f829 X-MS-TrafficTypeDiagnostic: CO2PR01MB2197: X-Microsoft-Antispam: BCL:0; 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dkim=none; arc=pass ("microsoft.com:s=arcselector9901:i=1"); dmarc=pass (policy=none) header.from=outlook.es; spf=pass (mx1.freebsd.org: domain of nixlist@outlook.es designates 40.92.41.53 as permitted sender) smtp.mailfrom=nixlist@outlook.es X-Spamd-Result: default: False [-4.80 / 15.00]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; RWL_MAILSPIKE_POSSIBLE(0.00)[40.92.41.53:from]; FROM_HAS_DN(0.00)[]; FREEMAIL_FROM(0.00)[outlook.es]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip4:40.92.0.0/15]; NEURAL_HAM_SHORT(-1.00)[-1.000]; DMARC_POLICY_ALLOW(-0.50)[outlook.es,none]; RCVD_IN_DNSWL_NONE(0.00)[40.92.41.53:from]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[outlook.es]; ASN(0.00)[asn:8075, ipnet:40.80.0.0/12, country:US]; MIME_TRACE(0.00)[0:+]; MAILMAN_DEST(0.00)[freebsd-questions]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Aug 2021 21:39:31 -0000 Hi, thanks for the helpful answer :) > > 1) DOS|GNU/Linux > > > > MBR > > +---Primary/Extended* 1 > > +---Primary/Extended* 2 > > +---Primary/Extended* 3 > > +---Primary/Extended* 4 > > (if Extended) > > +---Logic 1 > > +---Logic 2 > > +---. > > +---. > > +---. > > +---Logic nth > > Yep - except IMSC n is no more than 4. IMSC ? If you mean the same as what Christian told, I never had that limit of 4 logical in an extended partition. > This the standard way of installing FreeBSD on an MBR based > system - FreeBSD docs call the MBR partitions slices because they > wanted to keep the partition name as used on other platforms. Yes, I learned that, thanks :) I'd have to get used. > > Can a whole FreeBSD installation (mountpoints) be spread along > > multiple slices? > > Yes but the installer won't be much help. I see. I'll have to try what are the limits there and/or imagine how to organize the disk. > Unless MBR has changed since I last looked there could only > be one extended partition(slice) and it had to be the fourth. Other > than that this should work. Yes, is limited to 1. I originally intended to share an image where it was all clearer, but image size and that it was going to be outside the list, I gave up. Here it is. It is outdated and wrong in comparison with the schemes sent to the list as I learned the 8 partition limits after I made the image: https://i.ibb.co/Mgxz2qZ/freebsd-part.png This is the last edit and I haven't reviewed if it is the same I posted here: https://i.ibb.co/f2RZFst/bsdpart2021-08.png What I'm not sure about the place, if it needed to be fourth. I always set the last, but I don't remember if by restrictions, just for simplicity. I'll have to check because otherwise I'd have a big headache. The other option is just run on a virtual machine with enough space for it until I get used to FreeBSD and then cross the fingers to jump to a reorganized physical disk (after backups madness). > One more option (that you probably don't want), you can put > a BSD disklabel on the whole disc and not have an MBR or GPT at all > - this is called Dangerously Dedicated. I mention this only for > completeness. Thanks, but it will be shared with other OSs :) Not to mention that I'd still need more than 8 partitions. > > Despite I ask for MBR scheme, that is my BIOS/Disk system, I guess > > answers should be applicable to GPT, more or less, with its > > differences. > > GPT is *much* simpler if you want lots of partitions - > there's just one level and you can have as many as you like. No > partition/slice confusion, no BSD disklabels, no extended > partitions just a bunch of partitions with names that you provide. > MBR is considered obsolete and GPT the replacement. > > Highly recommend using GPT if all the OSs can use it. I know, but my system is "old" and doesn't support GPT (with BIOS instead EFI I'd say instead old; by the time could have EFI, but it doesn't). It is just what I have. Regards.