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In a traditional computing environment, individual machines typically run a single operating system and a single application. Server capacity often significantly exceeds the requirements for any single application, and, as a result, hardware utilization rates in many data centers are frequently below 20%. Virtualization is an approach by which several applications - sometimes running on different operating systems - run on the same piece of hardware, creating multiple "Virtual" servers from a single machine. The several virtual servers on each host machine are isolated from one another, as if on separate hardware.
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