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## 1U Rackmount Server: Power and Ruggedness Explained

Before anyone can understand the more complex parts of servers, one must understand its basics. Servers are essentially dedicated computers, so their architecture is always the same. However, the finer details of the aforementioned architecture and server components are where each server will vary from each other. Some will have certain specs, like the 1U rackmount server.

The term “rackmount” refers to the fact that the server is designed to be permanently attached to a rack – think of a metal shelf, but designed for servers. For example, a blade server can usually be mounted on a rack and contains what is called a blade server. Blade servers are a type of chassis that usually houses many thin and modular circuit boards, which are the server blades. Blades are, for all intents and purposes, board-attached servers that contain memory, processors, onboard network controllers, and I/O ports.

People new to the world of rackmount servers may experience a bit of confusion, and the same goes for determining industry standard height measurements. Specifically, the 1U part of the name specifies that the chassis that houses the server has a measurement of one rack unit height. A few simple calculations can further break this down; remember algebra class and think of the U as a variable defined as 1.75 inches. In other words, 1U means taking the 1.75 inches and multiplying them by one, so a 1U server is 1.75 inches tall. This type of simple calculation applies regardless of the measurement; for example, a 2U is 3.5 inches, a 3U is 5.25 inches, and a 4U is 7 inches.

Racks can also take the form of Rackmount U measurements. However, this does not make things more complicated. In fact, this measurement can be left as a U, and only simple logic follows from this point. Rather than having to remember to multiply each of the server heights by a variable letter, one can keep in mind that a rack is only as tall as the number of 1U servers it can accommodate. For example, if a rack is 20U high, this simply means that the rack is capable of housing 20 1U servers in it. Like the old measurement, it does not change with each measurement.

Just remember that the U is just one variable when the height in inches needs to be known, and calculating the height with that in mind becomes a very easy task.

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