When managing your resources, you should be aware of what your goals are.
In addition to resolving resource overcommitment, resource management can help you accomplish the following:
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Performance Isolation—prevent virtual machines from monopolizing resources and guarantee predictable service rates.
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Efficient Utilization—exploit undercommitted resources and overcommit with graceful degradation.
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Easy Administration—control the relative importance of virtual machines, provide flexible dynamic partitioning, and meet absolute service-level agreements.