Here are the steps to add additional swap. In this example the new swapfile is named “extraswap”.
cd /
dd if=/dev/zero of=extraswap bs=2048M count=3
/sbin/mkswap /extraswap
/sbin/swapon /extraswap
You must also edit the /etc/fstab to include the new swapfile named /extraswap.
cp /etc/fstab /etc/fstab.bak
vi /etc/fstab
~
/dev/VolGroup_ID_25103/LogVol0 swap swap defaults 0 0
/extraswap swap swap defaults 0 0