Patent ID: 8468380

Claim:
In a server rack, a method comprising: operating a power supply unit (PSU), the PSU to provide power exclusively to the server rack, in a first mode while the PSU determines that a power consumption module of a chassis management control module of the server rack is available, whereby in the first mode the PSU measures a first input power of the PSU and provides a representation of the first input power to the power consumption module in response to receiving a power measurement request from the power consumption module, wherein the chassis management control module is configured to activate and deactivate server nodes of the server rack in response to a power conservation policy; and operating the PSU in a second mode while the PSU determines that the power consumption module is unavailable, whereby in the second mode the PSU measures a second input power of the PSU and stores a representation of the second input power at the PSU independent of a power measurement request from the power consumption module.