Date: Sat, 31 Dec 2011 17:15:38 +0100 From: Polytropon <freebsd@edvax.de> To: Warren Block <wblock@wonkity.com> Cc: =?UTF-8?Q?=D0=9A=D0=BE=D0=BD=D1=8C=D0=BA=D0=BE=D0=B2_=D0=95=D0=B2?=, =?UTF-8?Q?=D0=B3=D0=B5=D0=BD=D0=B8=D0=B9?= <kes-kes@yandex.ru>, Robert Huff <roberthuff@rcn.com>, freebsd-questions@freebsd.org Subject: Re: reduce partition size. HELP Message-ID: <20111231171538.fd1156fb.freebsd@edvax.de> In-Reply-To: <alpine.BSF.2.00.1112310841430.50853@wonkity.com> References: <211353632.20111231040344@yandex.ru> <20222.32401.326222.536203@jerusalem.litteratus.org> <1112244537.20111231112327@yandex.ru> <alpine.BSF.2.00.1112310841430.50853@wonkity.com>
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On Sat, 31 Dec 2011 08:45:32 -0700 (MST), Warren Block wrote: > On Sat, 31 Dec 2011, ??????? ??????? wrote: > > > ????????????, Robert. > > > > ?? ?????? 31 ??????? 2011 ?., 5:16:33: > > > > > > RH> =?windows-1251?B?yu7t/Oru4iDF4uPl7ejp?= writes: > > > >>> Is there any way to reduce partition size on live system? > > > > RH> No. > > RH> Basic steps: > > RH> 0) go to single-user; unmount partition > > RH> 1) backup affected partition; test backup > > RH> 2) delete old partition > > RH> 3) create new/smaller partition > > RH> 4) restore from backup > > > > is there a way to goto singe-user through ssh? > > Single-user and unmounted partitions are desirable but not required. > See dump(8) about the -L option. Of course. And in addition, how about that? NOT TESTED! READ *FULLY* BEFORE DOING ANYTHING! For this example, /dev/ad0s1a is the / partition. There are other partitions (such as /var or /home) associated to other device files. Let's also assume /dev/ad0s1e is the /var partition. Onto the /var partition (or /home or any scratch oartition), copy the content from / (primarily because of /sbin, /bin and maybe /etc); maybe use this approach: # cd /var # dump -0 -L -a -u -f - /dev/ad0s1a | restore -r -f - Make sure /var does _not_ contain directory names identical to those found on the / partition! As I said, maybe use /scratch. :-) (Oh, and you can of course shorten the dump parameters to -0Lauf and restore's to -rf, but I chose this representation for making implicitely clear why to use _those_ options.) Then umount / and mount /var (I'll keep this for the example) as the new / (which now has all the things / should have): # umount /var # umount -f / ; mount -t ufs /dev/ad0s1e / Then the device associated to / should be free to be unmounted - a step desirable, but it should be no a "big" problem to operate on the device files associated with a _mounted_ partition. The more I think about it... /var is a really bad choice. Use /scratch, or at least /home. AGAIN: NOT TESTED! MAY BLOWENFUSEN & CORKENPOPPEN! :-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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