You set the CPU power management policy for a host using the vSphere Client.
ESX/ESXi supports the Enhanced Intel SpeedStep and Enhanced AMD PowerNow! CPU power management technologies. For the VMkernel to take advantage of the power management capabilities provided by these technologies, you must enable power management, sometimes called Demand-Based Switching (DBS), in the BIOS.
Launch the vSphere Client and log in to a vCenter Server system.
- In the vSphere Client inventory panel, select a host and click the Configuration tab.
- Under Hardware, select Power Management and select Properties.
- Select a power management policy for the host and click OK.
The policy selection is saved in the host configuration and can be used again at boot time. You can change it at any time, and it does not require a server reboot.