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Introduction
The key criteria by which CIOs and IT managers have always been judged are IT performance, functionality and availability coupled with maximum return on investment (ROI). Not surprisingly, these were also the main factors when selecting server and storage systems for deployment in data centers. The associated energy costs were simply the price that had to be paid for added performance. No energy awareness could develop because the data center's electricity bill never landed on the desk of the CIO or of the data center manager. In the meantime, concrete numbers, trends and forecasts by various parties are persuading CIOs to put data center energy efficiency on their agenda.

In this White Paper we intend to identify the main reasons behind these trends and also to put forward concrete proposals for optimizing data center energy efficiency. In most cases, there is no need to build an entirely new data center or to replace a major part of the existing power and air conditioning infrastructure, or such investment can be at least postponed until a later date.

Even though energy efficiency is a topic that is gaining in importance, the priorities adopted when selecting data center IT systems will change only slowly. A primary goal of the solution approaches we describe below is therefore not only to identify potential for energy efficient operation but also to satisfy the classical demands placed on data center infrastructures and to ensure adequate performance, functionality and availability.

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