If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space.
Swap space is a portion of a hard disk drive (HDD) that is used for virtual memory. It can be whole disk partition or just a file inside an existing partition or a combination of swap partitions and swap files.
We will see how to manage SWAP Partitions on RHEL 6.x or CentOS 6.x in following video tutorial.
1. Show current SWAP allocation
2. Create additional SWAP space from new partition
Reboot is required at this step
3. Make swap
4. Update /etc/fstab
UUID=8bced662-e967-4861-9bac-6df8957b3eb5 swap swap defaults 0 0
5. Re-reads /etc/fstab for swap
6. Show swap usage summary by device
Hope you found it informative and useful. Any questions or comments are welcomed.