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As large computing systems continue to grow in capacity and to offer improved price/performance, there is an increasing requirement to consolidate systems onto one processor complex. This paper describes the reasons why users need to run multiple operating systems today, provides a brief history of IBM's partitioning products, and introduces the Processor Resource/Systems Manager™, a machine feature on the IBM 3090 Model E and ES/3090™ Model S processors that provides users with a flexible and efficient capability to run multiple operating systems on a single processor complex.
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