I am currently running VMware vSphere 5 on a server I use for various projects. Mainly I use it for honing my skills with administration and running a few game servers.
Recently I was considering a move to Xen (xen.org) or possibly Citrix XenServer (Free version).
When I was looking at the various features not included in XenServer I noticed that one feature not included was memory overcommit. To my limited knowledge this was / is on VMware vSphere. The problem is since I was using VMware in a small environment (1 server) I am not even sure if I was utilizing memory overcommit.
So I am wondering partially what it is (memory overcommit) and how do I know if I was utilizing it or not?