I'm after some software to measure the power draw of a HP Server, namely a DL360 series. I know Nagios is used for logging and monitering but I'm not sure if it logs power usage as well. I've also tried to find the HP Server Management package but am not sure if this shows power usage either. I'm thinking my best bet would to buy some sort of device that goes inbetween the wall and the servers plug.
Can anybody suggest what would do for me?