Power Distribution Unit

Racks are divided into regions, 1.75 inches (44.45 mm) in height, within which there are three complete hole pairs in a vertically symmetric pattern,power distribution unit in hyderabad the holes being centered 0.25 inches (6.35 mm), 0.875 inches (22.23 mm), and 1.5 inches (38.10 mm) from the top or bottom of the region. 

Windows and Mac OS X server operating systems are deployed on a minority of servers, as are other proprietary mainframe operating systems,power distribution unit in Ahmedabad such as z/OS. The dominant operating systems among servers are UNIX-based or open source kernel distributions, such as Linux (the kernel).

power distribution unit in Delhi, Such a region is commonly known as a "U", for "unit", or in German "HE" (for Höheneinheit) and heights within racks are measured by this unit. Rack-mountable equipment is usually designed to occupy some integer number of U. For example, an oscilloscope might be 4U high, and rack-mountable computers are most often 1U or 2U high. A blade server enclosure might require 10U at power distribution unit in Kolkata. Occasionally, one may see fractional U devices such as a 1.5U server, but these are much less common.

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 (78.75 inches / 200 centimetres) high. Many wall-mounted industrial equipment power distribution unit in Guwahati enclosures have 19-inch rack rails to support mounting of equipment.