Date Added: Mar 2010
Networks are a shared resource connecting critical IT infrastructure, and the general practice is to always leave them on. Yet, meaningful energy savings can result from improving a network's ability to scale up and down, as traffic demands ebb and flow. The authors present ElasticTree, a network-wide power manager, which dynamically adjusts the set of active network elements - links and switches - to satisfy changing data center traffic loads. They first compare multiple strategies for finding minimum-power network subsets across a range of traffic patterns. They implement and analyze ElasticTree on a prototype testbed built with production OpenFlow switches from three network vendors.