nixCraft

I have a rhel 5 server in which the logical group is setup as can be seen below, I need to reduce the size of VolGroup00 to 200GB.
As you can see from below I have 201.09G free space in VolGroup00.
Any instructions on how to achieve it.

> vgs
/dev/hdc: open failed: No medium found
VG #PV #LV #SN Attr VSize VFree
VolGroup00 1 7 0 wz--n- 273.09G 201.09G
>
> lvs
/dev/hdc: open failed: No medium found
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
homevol VolGroup00 -wi-ao 10.00G
optvol VolGroup00 -wi-ao 10.00G
rootvol VolGroup00 -wi-ao 10.00G
swapvol VolGroup00 -wi-ao 2.00G
tmpvol VolGroup00 -wi-ao 10.00G
usrvol VolGroup00 -wi-ao 15.00G
varvol VolGroup00 -wi-ao 15.00G
>
> pvs
/dev/hdc: open failed: No medium found
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup00 lvm2 a- 273.09G 201.09G
>
> fdisk -l

Disk /dev/sda: 293.3 GB, 293378981888 bytes
255 heads, 63 sectors/track, 35667 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 16 128488+ 83 Linux
/dev/sda2 17 35667 286366657+ 8e Linux LVM
>
> df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-rootvol
9.7G 433M 8.8G 5% /
/dev/mapper/VolGroup00-usrvol
15G 2.3G 12G 17% /usr
/dev/mapper/VolGroup00-homevol
9.7G 155M 9.1G 2% /home
/dev/mapper/VolGroup00-optvol
9.7G 152M 9.1G 2% /opt
/dev/mapper/VolGroup00-tmpvol
9.7G 408M 8.8G 5% /tmp
/dev/mapper/VolGroup00-varvol
15G 320M 14G 3% /var
/dev/sda1 122M 18M 98M 16% /boot
tmpfs 4.0G 0 4.0G 0% /dev/shm
>

well after searching for a while came across
How to shrink a default install LVM PV to create another partition — Fedora Unity Project

had to do a little bit of arithmetic but finally got it done