A question often asked when it comes to creating virtual environments is how much CPU or memory will be needed in each node and how much to allocate per virtual machine. This is one of those questions that is very open-ended, because its answer varies greatly from environment to environment. However, there are a few pointers that need to be kept in mind to avoid over-allocation or under-allocation.

It is a fact that we will, and often do, run out of memory much sooner than CPU for a given Proxmox or any other host node. From the usage of each VM on the Proxmox nodes, we can determine the RAM and CPU requirements on that node. In this section, we are going to go over the factors that will help us to decide on CPU and memory needs.