!!only for linux using lvm, otherwise, you can use gparted.
fdisk
create partition (command:n )
change type to 8e (for LVM2) (command:t)
write(command:w)
restart
lvm pvcreate /dev/sda3
lvm vgextend VolGroup00 /dev/sda3
lvm lvextend -L32.5G /dev/VolGroup00/LogVol00 (set a large size, and you will know how many left, and then use ---extents parameter)
resize2fs /dev/VolGroup00/LogVol00 (very slow ... )