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The height of a rack can vary from a few inches, such as in a broadcast console, to a floor-mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.
Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...
A section of rail from a 19" server rack unit, showing how typical rack units 1U through 4U are distributed among the mounting holes. Date: 6 August 2007: Source: Own work, based on the public-domain image Server-Rack-Rail-Dimensions.gif at en.wikipedia: Author: Sakurambo: Permission (Reusing this file)
In a standard server-rack configuration, one rack unit or 1U—19 inches (480 mm) wide and 1.75 inches (44 mm) tall—defines the minimum possible size of any equipment. The principal benefit and justification of blade computing relates to lifting this restriction so as to reduce size requirements.
The choice of racks in a server room is usually the prime factor when determining space. Many organisations use telco racks or enclosed cabinets to make the most of the space they have. Today, with servers that are one- rack-unit (1U) high and new blade servers , a single 19- or 23-inch rack can accommodate anywhere from 42 to hundreds of servers.
The Sun Fire E25K (codenamed Amazon 25; the "E" denoting "Enterprise") was announced in February 2004. Its base cabinet is identical to the 15K, with the only difference between the two systems being the processor boards installed. It reached end-of-life in January, 2009, and was superseded by the Sun SPARC Enterprise M9000 server.
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