question about resizing partitions under lvm

[Richard Dice]

Hi everyone,

I'm interested in taking 100gb from my /var partition and giving it to my
/home partition.  Both partitions are using the ext3 file system and it's
all being co-ordinated by lvm.  Here's my partition setups:

monad:~# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg00-root
                      19682584   1130420  17552332   7% /
tmpfs                  4056128         0   4056128   0% /lib/init/rw
udev                     10240       128     10112   2% /dev
tmpfs                  4056128         0   4056128   0% /dev/shm
/dev/md0                482090     58405    398793  13% /boot
/dev/mapper/vg00-home
                     196861252 186862044         0 100% /home
/dev/mapper/vg00-tmp  49214272    184428  46529852   1% /tmp
/dev/mapper/vg00-usr  49214272   3638008  43076272   8% /usr
/dev/mapper/vg00-usrlocal
                     153796644   4885652 141098488   4% /usr/local
/dev/mapper/vg00-var 196861252    621272 186240008   1% /var

(There's a mirroring RAID-1 underneath all that too, but I don't think this
is an issue I need to concern myself with.)

Since I've not done this before, I wanted to get a basic sanity check out
there from people who are hopefully more familiar with this kind of thing.
My plan is (in pseudocode):

umount /var
resize2fs /dev/mapper/vg00-var -100G
lvreduce /dev/mapper/vg00-var -100G
umount /home
lvextend /dev/mapper/vg00-home +100G
resize2f /dev/mapper/vg00-home +100G
mount /home
mount /var

Does this make sense?  Do I need to worry about whether the /home and /var
partitions are adjacent, given that I'm doing this all under lvm?

Thanks,
 - Richard
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