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Steve, I appreciate the intent behind your statement that "there’s no easy way to test that the supplier is meeting those requests, which is why I don’t like them", but is it at all realistic? It seems to me that most things you can't test. Do you really have two cores dedicated to your VM? Or only until the host gets oversubscribed? Do you really have 400 I/O Ops/sec to the disk or only until something fails? Do you really have 250 1Gbps between two machines or only until someone else competes with you? Are these two machines really in failure isolated datacenters or is the provider cheating? You have to trust someone somewhere...