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A rack unit is a unit of measure used to describe the height of a server or other similar device mounted in a 19" rack. One rack unit is approximately 4.45 cm (1.75 in). Height is a measurement of the distance from the bottom to the top of something which is upright. ...
In computing, a server is: A computer software application that carries out some task (i. ...
Equipment mounted in several 19-inch racks A row of 19-inch racks in a modern server farm One of over (400) 19 inch by 49U racks at SNS, Spallation Neutron Source A 19-inch rack is a standardized (EIA 310-D, IEC 60297 and DIN 41494 SC48D) system for...
The metre (or meter) (symbol: m) is the SI base unit of length. ...
IN or in may stand for: India ISO country code Indiana state code Indium In symbol for the chemical element Intelligent network a telecommunications architecture Car designation for Ingolstadt Inch In Nomine Look up IN in Wiktionary, the free dictionary This is a disambiguation page — a navigational aid which lists...
One rack unit is commonly designated as "1U"; similarly, 2 rack units are "2U" and so on. The size of a server is usually described as a number in "U".
Professional audio and video gear often comes with rack mount options and use the same measurement specifications.
Half Rack units typically discribe units that fit in a certain number of RU, but occupy only half the width of the rack (9.5"). For example, a "4U Half Rack" DVCAM deck would occupy 4U space (1.75 * 4) height x 9.5" width. In theory, two half rack decks could occupy the 4U space.
Interestingly, a rack unit is equal to Vershok, which is an obsolete Russian length measure unit. Obsolete Russian weights and measures were used in Imperial Russia and after the Russian Revolution until they were replaced in the Soviet Union by a metric system in 1924. ...
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