question about resizing partitions under lvm

[Aviss,Tyler]

Does EXT3 size down nicely? I've never tried but experience with other  
FS's has been that it's a lot easier to go up than down.

(sent from my phone, so please excuse the typos)

On 26-Jun-09, at 2:33 PM, Richard Dice <rdice-e+AXbWqSrlAAvxtiuMwx3w at public.gmane.org> wrote:

> 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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