The appearance of a rack server does not look like a computer, and like a switch, there are 1U, 2U, 4U and other specifications. The rack server is installed inside a standard 19-inch rack. Most of this structure is a functional server. The rack server is actually a product under industrial standardization. Its appearance is designed according to a uniform standard and used in unison with the rack to meet the needs of the enterprise's server-intensive deployment