"Micro Cooling Fan" in the system settings for each layer of a group of DC-DC module, for all of the logical layer circuit boards or peripherals supply. Adopted by function in a distributed fashion, the system features for each group using a DC-DC power supply module. "Micro Cooling Fan" using veneer in a distributed fashion. Each system board or a logical disk drive by its own DC-DC module to provide a suitable voltage and current. For example, a file server aforementioned AC distributed power systems can in fact be distributed DC scheme. "Micro Cooling Fan" Here we give two different scale distributed file servers using the board power system design.