"Micro Cooling Fan" in the size of the file server contains a CPU board and 28 disk drives, divided into four layers installed (each 7 drives), the total power is less than 750W; high-end file server contains a CPU board and 56 disk drives, installation points and eight layers, the total power is less than 1500W. Two file servers can be the same type of module power supply and power supply systems in the same way, but a different number of power modules only, therefore, can save considerable development time and cost argument. First need 750W AC AC-DC front-end module 48V AC power is converted into DC power. "Micro Cooling Fan" in order to improve the reliability of using N + 1 redundancy scheme, the size of the file server front-end modules require 1 + 1 redundancy, high-end file server front-end module requires 2 + 1 redundancy. Secondly, to the CPU board, and each disk drive configuration a 30W dual-output DC-DC module on it. Of course, "Micro Cooling Fan" system, each disk drive can also use the N + 1 redundancy scheme, because the cost is too high, such as non-special needs generally do not.