ram – Swap size on ubuntu server

The administrator explained me that it is important to notice than it could be a lot of VM (40 in my case) on real server machine, so the right way is to avoid lock disk space, but set correctly the required RAM.

The red hat advice at : https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-swapspace
mentioned in How to decide on Swap size post explain their point of view if “you want sufficient memory for your system to hibernate”. In my case, the server never hibernates (data center), so no much Swap memory.