VMWare ESXi “Out of resources”

Somewhere deep in the history of computing, there is a document that says all error messages must be obscure and poorly documented. Rarely does one find a error message that is clear, concise and tells you exactly where to look. Not that it’s impossible, just rare. This weekend I ran across what should have been an easy error in ESXi, “Out of resources”. Unfortunately ESXi doesn’t tell you which specific resource, just that one of the many may be maxed out. If you google the error message you’ll get

lengthy documents which might not solve the problem. In my case? The datastore had run out of space for the VMs swapfiles/etc.