Disable swapping for the associated logical volume:

# swapoff -v /dev/VolGroup00/LogVol01
Resize the LVM2 logical volume by 256 MB:

# lvm lvresize /dev/VolGroup00/LogVol01 -L +256M
Format the new swap space:

# mkswap /dev/VolGroup00/LogVol01
Enable the extended logical volume:

# swapon -va
Test that the logical volume has been extended properly:

# cat /proc/swaps # free