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Energy consumption is a crucial and rising operational cost for data-intensive computing. In this paper the authors investigate some opportunities and challenges that arise in energy-aware computing in a cluster of servers running data-intensive workloads. A key insight is that in most data centers, servers are underutilized, which makes it attractive to consider powering down some servers and redistributing their load to others. Of course, powering down servers naively will render data stored only on powered down servers inaccessible. While data replication can be exploited to power down servers without losing access to data, unfortunately, care must be taken in the design of the replication and server power down schemes to avoid creating load imbalances on the remaining "Live" servers.
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