Hi Chandra
Swap space needs to be checked at the OS Level .. What is your OS version.
If you are on Linux - use the command "free" which will show you the swap space ,see the following link
How to Check Swap Space in Linux (with Pictures) - wikiHow
Regarding NFS ( Network File System ) , it is a shared location which is present locally in one server ( like DEV or PROD ) and mounted to the other servers.
This is generally used for /usr/sap/trans ( for transport directories )
Hope the above helps to clarify.
Thanks
Rishi