Distributed Power Management (DPM)
VMware DPM is a component of VMware DRS that makes recommendations or decisions to power off or power on hosts to save energy. These recommendations are based on a comparison of the available capacity in a DRS cluster against resource requirements of virtual machines plus some administrator defined buffer capacity requirements. If DPM detects there are too many hosts powered on, it will consolidate virtual machines onto fewer hosts and power off the remaining. VMware DPM will bring
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VMware DPM automatically powers off physical servers to reduce power consumption in datacenters.
powered off hosts online once again to meet virtual machine requirements either at a predefined time or when it senses virtual machine requirements increasing.