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The growing economical and environmental cost of data centers due to the high energy consumption is becoming a major issue. "Green Data Centers" refers to, energy aware, energy efficient and CO2 emission minimizing designs, protocols, devices, infrastructures and algorithms for data centers. Today's data centers are provisioned for peak load. However, it is shown that servers are idle most of the time. Idle servers and the connected network elements are consuming considerable amount of energy. In this survey, the authors identify the key enablers of green data center research. Firstly they overview the green metrics that are applicable to data centers. Then, they describe the most recent stage of research and give a taxonomy of the related work.
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