I have several servers from the HP DL360 line (generations 5-8). Each of these servers has two power supplies installed. The 2 power supplies in each server are fed from different circuits.
My question is will the power draw be roughly balanced between these two circuits, or do the servers consider one power supply to be a "primary" and the other to be a "backup" with a smaller power draw?
Best Answer
I'm going to give an HP Proliant-specific answer here, since the OP is asking about the HP product line.
Let's use the example of an HP DL360p Gen8 (also applies to G6, G7 and Gen9 servers):
You have the option to configure the Redundant Power Supply Mode in the HP Rom-Based Setup Utility (press
F9
at boot) with:Of the two main options, there's some granularity in the High-Efficiency Mode:
An example of the Balanced Mode on a busy server:
An example of the High Efficiency Mode on an idle server:
An example of the High Efficiency Mode on a busy server:
Detailing the relative efficiency of single PSU, load-balanced PSUs and High Efficiency mode on a 750W power supply.