Consolidation of physical servers into virtual machines that share host physical resources can result in significant reductions in the costs associated with hardware maintenance and power consumption. VMware Distributed Power Management (VMware DPM) provides additional power savings beyond this initial benefit by dynamically consolidating workloads even further during periods of low resource utilization. Virtual machines are migrated onto fewer hosts and the unneeded ESX hosts are powered off. VMware DPM is an optional feature of VMware Distributed Resource Scheduler (DRS).
Back in September for VMworld 08 a team of engineers at VMware setup a demo to showcase VMware's power management features. This demo drives a heavy, mixed workload for an eight-hour day and shows metered power usage throughout. The workload used was VMmark and the total power savings were over 55%! This feature (DPM) is available experimentally in VI3 and will be fully 
supported with the next release.
supported with the next release. Source: VMware
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