Rack mount servers are systems in a modern server used for mounting various kinds and sizes of electronic modules. If someone needs to set up a number of personal computers into a much smaller space, rack mount servers are ideal.

Rack mount servers are used across different parts of the world for a number of purposes, starting from the world of video editing suites, computer animations and other three-dimensional works. These rack mount servers are available in various sizes depending on their height and configurations. The usual sizes are 1U, 2U, 3U, 4U, 5U, 6U, and 7U, as per the definition of the Electronic Industries Association (EIA). These numbers are used to describe the various sizes of the rack mount server cases. They are generally used to describe the height of the cases with a constant width of nineteen inches.

These cases are available at various retail shops. But the best way to make a choice is only after doing research. A number like 1U or 2U does not make sense if there is no clear notion about the unit through which it is measured. This U comes from the term unit. But the real term of the unit is RU, or simply Rack Unit, where one RU or U is defined as 1.75 inches. Therefore, a 2U rack mount server has a height of 1.75x2 inches, i.e. 3.5 inches of height with a constant width of 19 inches.

A 2U rack mount server is the ideal configuration when it comes to limited system space. But this type of rack mount requires more plug-in cards than those of a 1U server. Most of the 2U rack mount servers are available with drives that have the capacity to support three slots. It is also ideal for custom use, and appeals to a variety of customers.