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Data centers are the building blocks of IT business organizations providingthe capabilities of centralized repository for storage, management, networkingand dissemination of data. With the rapid increase in the capacity and size ofdata centers, there is a continuous increase in the demand for energyconsumption. These data centers not only consume a tremendous amount of energybut are riddled with IT inefficiencies. All data center are plagued withthousands of servers as major components. These servers consume huge energywithout performing useful work. In an average server environment, 30% of theservers are "dead" only consuming energy, without being properly utilized.Their utilization ratio is only 5 to 10 percent. This paper focuses on the useof an emerging technology called virtualization to achieve energy efficientdata centers by providing a solution called server consolidation. It increasesthe utilization ratio up to 50% saving huge amount of energy. Serverconsolidation helps in implementing green data centers to ensure that ITinfrastructure contributes as little as possible to the emission of green housegases, and helps to regain power and cooling capacity, recapture resilience anddramatically reducing energy costs and total cost of ownership.

Server Consolidation: An Approach to Make Data Centers Energy Efficient and Green