First of all, according to their own needs to consider, the standard cabinet is 42U, which is the international common specifications, 1U=44.45mm, the thickness of 4.445cm as the basic unit. 1U is 4.445cm, 2U is 2 times of 1U is 8.89cm, that is to say, the so-called "1U server", the standard cabinet can store 18 1U servers, 42U is 2 meters high, 0.6 meters wide and 0.8 meters deep server cabinet, may also be 2 meters, 0.6 meters wide and 0.96 meters deep server cabinet.