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Reference Architectures: Multi-node
Multi-node Deployment
In a production environment, you will not likely ever have a Multi-node deployment of OpenStack, partly because it forces you to make a number of compromises as to the number and types of services that you can deploy. It is, however, extremely useful if you just want to see how OpenStack works from a user's point of view.
More commonly, your OpenStack installation will consist of multiple servers. Exactly how many is up to you, of course, but the main idea is that your controller(s) are separate from your compute servers, on which your users' VMs will actually run. One arrangement that will enable you to achieve this separation while still keeping your hardware investment relatively modest is to house your storage on your controller nodes.