What are standard sizes of server racks?

We often say how many U cabinets are used, so what is the concept of U? The following small series will summarize some problems about cabinet size for you. U is a unit of server external dimensions, which is an abbreviation of unit. The detailed dimensions are determined by the American Electronics Industry Association (EIA), which is an industry group. The reason for specifying the size of the server is to keep the server in an appropriate size so that it can be placed on an iron or aluminum rack. The rack is provided with screw holes for fixing the servers, so that it can be aligned with the screw holes of the servers, and then fixed with screws to facilitate the space needed for installing each server. The specified dimensions are the width (48.26 cm = 19 inches) and height (multiple of 4.445cm) of the server. Because the width is 19 inches, the rack that meets this requirement is sometimes called “19-inch rack”. Thickness is 4.445cm, and 1U is 4.445cm ..

I. Size of 19-inch standard cabinet:
The equipment installation height in the 19-inch standard cabinet is expressed by a special unit “u”, with 1U=44.45mm U refers to the effective use space inside the cabinet, and the panels of standard equipment using 19-inch standard cabinets are generally manufactured according to the specifications of n u. For some non-standard equipment, most of them can be installed and fixed in a 19-inch chassis through additional adapter baffles. The panel width of most engineering-grade equipment is 19 inches, and the installation hole distance is 465 mm. Therefore, as long as the cabinet can meet the installation requirements of most 19-inch equipment, the cabinet is a standard cabinet.

The 19-inch standard cabinet has three general indexes: width, height and depth. The physical width of the cabinet is usually 600mm and 800 mm. Generally, the height is from 0.7M2.4M, which depends on the number of equipment in the cabinet and uniform style. Usually, manufacturers can customize special heights. The common finished 19-inch standard cabinets are 1.6M, 1.8M and 2M in height. Generally, the depth of the cabinet ranges from 600mm to 1000 mm, depending on the size of the equipment in the cabinet. Usually, manufacturers can customize products with special depth. The common finished 19-inch standard cabinets have depths of 600 mm, 700mm, 800mm and 900 mm. The structure of 19 “standard cabinet is relatively simple, mainly including basic frame, internal support system, wiring system and ventilation system. 2. The “U” and “19-inch” U of electronic standard cabinet are a unit for expressing the external dimensions of the server, which is an abbreviation of Unit. The detailed dimensions are determined by the American Electronics Industry Association (EIA), which is an industry group. 1U=44.45mm=1.75 inches, 1 inch = 25.4mm 19 = inches, 482.6mm The reason for specifying the size of the server is to keep the server in an appropriate size so that it can be placed on an iron or aluminum rack. The rack is provided with screw holes for fixing the servers, so that it can be aligned with the screw holes of the servers, and then fixed with screws to facilitate the space needed for installing each server. The specified dimensions are the width (48.26 cm = 19 inches) and height (multiple of 4.445cm) of the server. Because the width is 19 inches, the rack that meets this requirement is sometimes called “19-inch rack”. The thickness is 4.445cm as the basic unit. 1U is 4.445cm, and 2U is 8.89cm which is twice as large as 1U. The 19-inch standard cabinet 19 represents the width, that is, the cabinet where the 19-inch rack-mounted server can be placed. The cabinet is also divided into U degrees and depth; Generally, the height is 42U, and 1U and 19 inches here are industrial standards formulated by EIA. The structure of standard cabinet is relatively simple, mainly including basic frame, internal support system, wiring system and ventilation system. The 19-inch standard cabinet has three general indexes: width, height and depth. Although the installation width of 19-inch panel equipment is 465.1mm, the physical width of cabinets is 600mm and 800mm. Generally, the height ranges from 0.7M-2.4M, and the heights of common finished 19-inch cabinets are 1.6M and 2M. Generally, the depth of cabinet ranges from 450mm to 1000mm, depending on the size of equipment in cabinet. Usually, manufacturers can customize products with special depth. The common finished 19-inch cabinets have depths of 450mm, 600mm, 800mm, 900mm and 1000mm. The equipment installation height in the 19-inch standard cabinet is expressed by a special unit “u”, with 1U=44.45mm Equipment panels using 19-inch standard cabinets are generally manufactured according to nU specifications. For some non-standard equipment, most of them can be installed and fixed in a 19-inch chassis through additional adapter baffles. The panel width of many engineering equipment is 19 inches, so the 19-inch cabinet is the most common standard cabinet. 42U refers to the height, 1U=44.45mm,42u The cabinet of 42u can’t hold 42 1U servers, but it is normal to put 10-20 servers, because they need to radiate heat at intervals of 19 inches, which is 482.6mm wide (there are “ears” on both sides of the equipment, and the mounting hole distance of the ears is 465mm). The depth of the equipment is different, and the national standard does not specify how much the depth must be, so the depth of the equipment is determined by the equipment manufacturer. Therefore, there is no 1U cabinet, only 1U equipment, and there are 4U–47U cabinets, that is, a 42U cabinet can theoretically install 42 1U high equipment, but in practice it is normal to put 10-20 equipment, because they need to dissipate heat at intervals.