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In today's data centers, precisely controlling power consumption is an essential way to reduce operating costs, and avoid system failures caused by power capacity overload or overheating due to increasingly high server density. While various power control strategies have been recently proposed, existing solutions are not scalable to control the power consumption of an entire large-scale data center, because these solutions are designed only for a single server or a rack enclosure. In today's data centers, however, power control needs to be enforced at three levels: Rack enclosure, power distribution unit, and an entire data center, due to the physical and contractual power limits at each level.
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