I'm trying to figure out my colocation needs and one requirement is the power usage of a server. Most colocation providers give you the option of between 0.4 and 1 amps per U server. How should I go about working out how much power a server would use?
here is a link to the calcs
What's the model of your box? Power consumption should be listed in the hardware specs of your server. Typically this is an absolute max, meaning that'll be the max load that the server draws under full utilization and during power-up. Consumption during general use is typically lower than the specs list.
In addition to what squillman said. I know at least Dell has a utility that you put all the models you need into a diagram, and it prints out a report of Max Power, Cooling, etc. by Rack and by server - sorry it's been almost 2 years since i've needed it so i forget it's name just remember it exists. I'd be surprised to find that the other vendors didn't have a utility like that available.