"Micro Cooling Fan" scale 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, points 8 floor installation, 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 "Micro Cooling Fan" need 750W AC AC-DC front-end module 48V AC power is converted into DC power. 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, "Micro Cooling Fan" to the CPU board, and each disk drive configuration a 30W dual-output DC-DC module on it. Of course, each of the system disk drive can also use the N + 1 redundancy scheme, because the cost is too high, such as non-special needs generally do not.