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Hi there! Welcome to OpenStack. Your question, as you've phrased it, is impossible to answer -- your hardware requirements depend entirely on what you hope to accomplish with OpenStack. If you're just trying it out, you can run everything on a single host -- or in multiple virtual machines. You can also run a simple environment with two or three physical hosts.

If you're trying to serve a large organization, you may need tens of compute nodes and several controllers. And load balancers, and switches, and storage servers.

A good place to start is, "how large do I need my virtual instances to be, and how many do I want to be able to have active at once"?