Increase LVM Swapspace on Red Hat Linux 5/6

The following commands allow an existing swap LV to be extended where capacity exists within the volume group.
Check available space for swap growth with:

This will show VFree in RH column
If enough available, then increase swap using:
swapoff -v /dev/VolGroup00/LvSwap
lvresize /dev/VolGroup00/LzSwap -L 10G
mkswap /dev/VolGroup00
swapon -v /dev/VolGroup00/LvSwap

All should be good now for a 10G swap in VolGroup00, named LvSwap