It can also describe a unit that is 1U high and half the depth of a 4-post rack (such as a network switch, router, KVM switch, or server), such that two units can be mounted in 1U of space (one …

Jun 11, 2025 · In simple terms, a rack unit is a standard measurement used to describe the vertical height of rack-mountable equipment. 1U equals 1.75 inches (or 44.45 mm), making it …

Apr 24, 2017 · What does 1U mean? A “U” or rack unit is a measurement of the height of a piece of computer or network gear that is designed to fit into a standard 19″ or 23″ rack.

A 1U server is one of the most common configurations in data centers. Occupying only 1.75 inches of vertical space, 1U servers are designed for environments where space is at a premium.

Apr 3, 2013 · For electronic equipment racks (e.g., 19 or 23 inches wide), the term 1U is used to define one rack unit of height. 3U height would be 3 x 1.75” = 5.25-inches. It should be noted …

What Does the Rack Unit U Mean? A Rack Unit (U or RU) is basically how we measure how tall equipment is when it’s built to go into a server rack. It’s a Set Height: Listen, one Rack Unit …

Jan 3, 2008 · For electronic equipment racks (e.g., 19 or 23 inches wide), the term 1U is used to define one rack unit of height. 1U equals 1.75-inches (44.45mm) of rack height.

Nov 21, 2025 · The main difference between 1U, 2U, and 4U servers lies in their height and the amount of space they occupy in a rack. 1U servers are the most compact, taking up the least …

According to the EIA standards, rack holes are grouped in sets of three, with each group corresponding to 1U of height. This allows for easy determination of rack height by counting …

The 'U' in any server description is short for "RU" which stands for Rack Unit -- this is the standardized designation for the form factor of the server: 1U = 1.75" in height or thickness. …