See explanation below.
Use fdisk /dev/hda ->To create new partition. Type n-> For New partition - It will ask for Logical or Primary Partitions. Press l for logical. It will ask for the Starting Cylinder: Use the Default by pressing Enter Key. Type the Size: +100M ->You can Specify either Last cylinder of Size here. Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that means Linux Native. Type t to change the System ID of partition. Type Partition Number - Type 82 that means Linux Swap. Press w to write on partitions table. Either Reboot or use partprobe command. mkswap /dev/hda? ->To create Swap File system on partition. swapon /dev/hda? ->To enable the Swap space from partition. free -m ->Verify Either Swap is enabled or not. vi /etc/fstab/dev/hda? swap swap defaults 0 0 Reboot the System and verify that swap is automatically enabled or not.