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    What criteria are you evaluating for making the decision? Number of simultaneous users? Ease of deployment? Or something else? Commented Dec 8, 2014 at 17:52
  • @RobertHarvey right, sorry for not clarifying; I made the appropriate edits. Commented Dec 8, 2014 at 18:02
  • How much load do you have? Is it enough to justify two machines? Commented Dec 8, 2014 at 18:26
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    Then put it on one machine and divide the load later if and when it ever becomes a problem. Commented Dec 8, 2014 at 19:43
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    Multiple machines isn't about separation of concerns; it's about load distribution. Separation of concerns is a software design concept; done correctly, it can make the process of load distribution easier. Commented Dec 8, 2014 at 19:46