Date: Sat, 16 May 2015 13:10:23 +0200 From: Polytropon <freebsd@edvax.de> To: Avinash Sonawane <rootkea@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Swap partition for FreeBSD Message-ID: <20150516131023.fbd69d58.freebsd@edvax.de> In-Reply-To: <CAJ9BSW95jTMTj=k_LMg5DDTm0G-LnDktox4hJP5woTWa%2B5yDDg@mail.gmail.com> References: <CAJ9BSW9cVmd8c%2B4E5rWAd9FPDvgpwqVKDSh7962FW3-g_W9jMQ@mail.gmail.com> <55570A54.2080107@FreeBSD.org> <CAJ9BSW-uBVM=dj%2Bd2_1AxDxsoRpUG2s=-XpWe=auib1jMf32uQ@mail.gmail.com> <20150516123303.8d9cf0dc.freebsd@edvax.de> <CAJ9BSW95jTMTj=k_LMg5DDTm0G-LnDktox4hJP5woTWa%2B5yDDg@mail.gmail.com>
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On Sat, 16 May 2015 16:16:13 +0530, Avinash Sonawane wrote: > I have 4 Primary partitions. Out of which one ada0s1 has FreeBSD, > ada0s2 has Debian, ada0s3 is one extra Primary partition (which > currently holds data) and ada0s4 is an extended partition (to create > further logical partitions like linux-swap, data partitions etc.) Okay, so you should be able to put the swap into ada0s1. > >> After searching a bit on the web I came to know that default kernel > >> build options specify "options GEOM_PART_EBR_COMPAT" which prevents > >> GEOM from editing EBR partition schemes. So to create a partition of > >> type freebsd-swap in extended partition it looks like I need to > >> recompile the kernel without the GEOM_PART_EBR_COMPAT kernel option. > > > > It seems to be that way. Using "extended DOS partitions" has never > > been a good idea. :-) > > > > However, as I initially wrote, this isn't _needed_ when you put > > the swap partition into the slice where the rest of your FreeBSD > > installation resides. You can have up to 4 "DOS primary partitions" > > (slices), and each one could carry an independent OS install. > > I have Freebsd installed in ada0s1a so can I create ada0s1b inside > ada0s1 to have freebsd-swap? How do I do that? Using bsdlabel, for example. As shown in the manpage as well as in the "legacy parts" of the FreeBSD handbook, you'd have to modify the partition table entry to include a swap space. This typically involves either re-installing, or the more common dump + restore process (for ada0s1a, /, holding your installation). This is a comparable process: https://www.freebsd.org/doc/en/books/handbook/install-steps.html See 3.6.5. Also read "man bsdlabel". You will use a command like # bsdlabel -e ada0s1 to make the changes to how the slice will be used. You have to come from something like this: # size offset fstype [fsize bsize bps/cpg] a: 1000000 16 4.2BSD 2048 16384 5128 c: 1000016 0 unused 0 0 to something like this: # size offset fstype [fsize bsize bps/cpg] a: 900000 16 4.2BSD 2048 16384 5128 b: 100000 900000 swap c: 1000016 0 unused 0 0 Numbers are nonsense here. :-) You need to create a type "swap" partition, and / will be resized in that process of course. Space will be consumed from ada0s1, not ada0s6. I surely don't have to mention that it's considered mandatory to have a good backup before making changes with such impact. > Or should I create ada0s6b as swap partition inside ada0s6 slice? That is probably also possible, but I've never actually used "extended DOS partitions" in production, so I can't tell you if FreeBSD will deal with them in the same way as Linux. But it should be possible. I don't know if it's possible to "dynamically resize" the / partition without data loss, that's why I mentioned backups. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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