If you buy cloud services without double-checking exactly what you’re getting and without a real service-level agreement (SLA) you might as well be buying a pig in a poke — in other words, you really won’t know what you’re buying until you’ve wasted your money.
Let’s say you want to use a public cloud for your company. They’re easy, they’re cheap, and they’re available. There’s only one little problem: What assurance have you that you’ll get the performance you need when you need it. The answer, without a detailed service level agreement (SLA) that covers quality of service (QoS), is none.