While reading this paper, you must be aware that today’s business executives are concerned not only with the growing costs of energy to run and cool data centers, but also with presenting a green corporate image in today’s era of heightened environmental awareness. The data center has become a major energy consumer on the corporate balance sheet. At the same time, many IT organizations are facing a multidimensional crisis that is the first of its kind in the history of information processing. These companies are experiencing a virtual explosion of information to process and store as energy costs soar to record levels. More energy efficient data centers can help reduce environmental impact while curbing IT costs.