Yea, but it's not an easy answer. It may depend on the load you're going to throw at them, geographical footprint, expectation, etc. You've got at least, MySQL, a file server, and a web server. And each of those may react differently depending on your environment. In general, you should be looking for recommendations to run those services/servers. If you're hosting, each of these services needs to be evaluated against your need, budget, expertise, and expectation. Since you're talking VM, start by spreading those out to three VMs and start watching load if you're not sure. Are you having issues or just looking for best practices?
