Date: Mon, 10 Aug 1998 08:29:56 -0400 (EDT) From: CyberPeasant <djv@bedford.net> To: jms@caja-granada.es (Jose M. Megias Sanchez) Cc: freebsd-questions@FreeBSD.ORG Subject: Re: extend file system Message-ID: <199808101229.IAA09487@lucy.bedford.net> In-Reply-To: <01bdc436$5cc60000$00008282@jms> from "Jose M. Megias Sanchez" at "Aug 10, 98 10:10:40 am"
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Jose M. Megias Sanchez wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hello, I have a little problem. My fylesystem /usr is full and I would like
> to extend its size, in other unix (hp-ux) its too easy with the command
> extendfs but FreeBSD don't has it.
>
> I have the following fylesystems:
> mulhacen2# df -k
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> /dev/sd0a 297423 18048 255582 7% /
> /dev/sd0s2h 2244926 17 2065315 0% /home
> /dev/sd0s2e 248175 3362 224959 1% /tmp
> /dev/sd0s2f 496367 467706 -11048 102% /usr
> /dev/sd0s2g 695311 2094 637593 0% /var
> procfs 4 4 0 100% /proc
> /dev/wcd0c 600108 600108 0 100% /dist
>
> I would like extend /usr with 100 Mb catching the space from /home (by
> the moment not used). I have a backup of all fylesystems obtained with DUMP,
> How can I do now to extend /usr?, newfs -s maybe?. Regards.
I'll assume that the partitions are laid out in alphabetical order
on the disk, and that newfs will DESTROY the contents of any partition
on which it is run.
Currently:
size in K offset in blocks
/usr 248175 X
/var 695311 X + 2*(248175)
/home 2244926 X + 2*(248175 + 695311)
Later:
/usr 348175 X
/var 695311 X + 2*(248175) + 200000
/home 2144926 X + 2*(248175 + 695311) + 200000
/var is saved somewhere. /home is empty. We shall "slide" var and
home 200K blocks down the disk, shrinking home (sd0s2h) and expanding
sd0s2f (usr).
Go to single user mode. (kill -TERM 1)
Umount /home. Redefine home (sd0s2h) to have a size 200K blocks
smaller than at present, and an offset 200K farther into the disk.
(use disklabel -r -e sd0s2 ).
Newfs the new sd0s2h partition, and mount it on /home
Copy the current /usr partiton to this new /home. (build it as the whole
tree, not a tar archive or something else.
(cd /usr; tar cpf - . )|(cd /home; tar xvpf -)
Redefine (disklabel -r -e sd0s2 ) the /var (sd0s2g) partition to have an
offset 200K blocks larger than at present.
newfs the new /var partition, and restore it from wherever it is stored.
(I'd just make a tar file on / or somewhere on disk-- you've got plenty
of space on /. (Don't use /tmp -- maybe you'll get a reboot by mistake).
Remount the /var partition. (We're done with it).
umount /usr
umount /home
mount the home (sd0s2h) partiton temporarily on /usr, if you need
man pages, or other stuff on /usr. (vi from /usr/bin? who knows?)
(mount /dev/sd0s2h /usr)
disklabel the usr (sd0s2f) partition, adding 200K blocks to the size.
Leave offset alone.
newfs the new sd0s2f partition. Mount it on /mnt Restore the files:
(assuming that the home partition is on /usr)
(cd /usr; tar cpf - . )|(cd /mnt; tar xvpf -)
umount /dev/sd0s2h
umount /mnt
mount /dev/sd0s2f /usr
mount /home (maybe newfs it later -- quicker than rm -r *)
return to multiuser mode. Check operation. Then clean out /home.
Check my work before preceding. Some people say I'm not "definitive"
enough. You may wish to replace "200000" and "200K" with a number
of blocks that is an integer multiple of cylinders.
Keep those backups -- it's too easy to ruin a disk layout with disklabel.
Watch disklabel messages carefully.
Dave
--
Bedford County, PA -- 47,000 polite, friendly Appalachians,
4,000 of whom have concealed-carry permits.
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