How to calculate the power consumption of equipment for placement in a DC?

Question

Electronics

Good day, dear habra community!
I ran into the following situation, the answer to which I could not google on the Internet.
The company in which I work decided to locate its servers in one data center, where, with unit placement, there is a limit on the maximum allowable power consumption per unit of 100 watts. Accordingly, we had a logical question: how to calculate the power consumption of our equipment. In the specification, for example, on the EMC VNXe3150 storage system, the figure is 460W max, single-unit servers have a 650W PSU. These are all maximum figures, but how to calculate how much the server / storage / firewall consumes on average in practice? The problem is aggravated by the fact that in fact there is no equipment on hand and will not appear (it will be located in Europe and purchased there).
Threat Wanted to be placed per unit, tk. to start the equipment there will be 6 units and taking the whole rack turns out to be relatively expensive (if you divide the cost of the rack by the cost of one unit, you get about 20 units)

Answer 1

1. The sum of the components
2. Use a household wattmeter to measure
3. The data center will calculate based on the max. block power consumption (460W and 650W in your case)

Answer 2

I always use the simplest technique, I look for a similar server on the Internet and see what average power consumption it indicates, well, I always underestimate it if the server is under a small load.

Answer 3

We have used one of these PDUs with an ethernet connection where each port can report.
To plan the placement with their electricians, they measured the current consumption of the clamps. The allocated power that the data center needs to take away from you is average, so measure how much each server eats into your normal load. Or not everyone, but just a stand, see for yourself according to the situation. Maximum currents are needed so that the wiring can withstand them and the machines do not kick out, they usually do not last long when turned on. By the way, smart PDUs can not turn on all ports at once, but in turn.

Answer 4

In general, it’s clear that nothing is clear :(
For example, we have one storage system with a BP of 460, 2 servers of 500 each and a firewall of 150. In total, the maximum power is 1610, but for the life of me I won’t believe that this hardware will consume so much.
By the way , for those who were afraid that the DC would count according to the power indicated on the PSU - this is not so, they said that if we are sure that the server will consume less, then we can order a rack with a lower maximum power, it turns out that we consume more - we will change the "tariff plan ".

Answer 5

Power is always calculated according to the power supply rating. It is considered a data center.
It is impossible to allow overload and allow that the machine will work and the equipment will be cut down. After all, several clients hang on one machine.
Therefore, measurements of the possibility will give little. When measuring, it is alone, but during operation it can reach the peak somewhere.