1U format are preferred by companies for use in data hosting, and because they very compact (only 4.4 cm high) are installed with a large number of servers per rack. The main limitations of this format are the limits of the ventilation (because of the small room inside), which prevents the use of processors with high energy consumption and the need for special coolers and fans and all use an extra charge. Besides the basic components, spare parts installation area in general 2 or 4 hard drives 3.5 “(depending on the disposition of the other ingredients) and a single expansion card, horizontal, with the installed with p is a riser.

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Then there is the 2U servers. use “normal” energy sources and cooling, and thus end up being a little cheaper. The largest interior makes the format more suitable for 2U with two or more processors, or processors that have a high consumption . Use the amount is not sufficient to install expansion cards vertically as a tower server, but you can use a survey (as in the case of 1U), or use half-height cards (floor boards, the half the height of the boards have normal)

Finally, we have the biggest server, 3U or 4U servers use her 6U, but they are rare .. This format is usually by disk arrays and chassis for blade servers (see below) used. using 3U server, or more completely eliminated the problems of space, can be shaped expansion cards in a vertical and installed a large number of removable hard drives in the bays, but the server needs to occupy more space in the rack, what the costs are elevated to the data center host, where you have to pay extra per pen used.

Another format, which is a growing blade server (blade comes from the word “lame,” says the small format ), a brilliant idea to further increase the density of servers and allows sharing of elements in the data center, such as power supplies and optical drives.

The idea is that instead of with 10 1U servers, with 10 sources (or 20 if the sources were redundant), 20 network cable (each server is typically used two cables, one for the network and another for the management or redundancy) as well as power cables, used cables from KVM and so on, you can with a single chassis, with a corresponding number of blade servers.

Each sheet is a full server with its independent processor, memory, network card and hard drives. Its small size, blade servers typically low-power processors and hard drives use 2.5 “. At first it was the sharing of Transmeta and VIA processors, but it ended up being almost completely from Intel and AMD multi-core version is much faster, but still relatively cheap. For hard drives, 2.5 “drives of the favorites to access times lower (but lose in terms of transfer rate), and more power consumption.

The idea is not every blade system are created equal. . If you jump into the campaign so blade, you should find the best system shaped blade for you See below for comparisons decided that helps you compare the best of them:

HP vs IBM Blade Blade System

HP vs Dell Blade Blade Systems> / p>

Blade servers