There are many kind of servers in Data Centers, they are differentiated according to their arrangement and their size. One of the most famous and known servers are Blade Servers. Blade Servers are design in such a way that they occupy minimum space. Unlike other rack-mount server which have many heavy parts including network cord and power cord, Blade server are stripped of anything unwanted leaving only the most useful functional parts. In a blade server enclosure it can hold cooling, network, power and many other interconnects. Blade server also differ from each other on the question of what should be included in the server enclosure. Blade server are good for normal hosting as well as Cloud Hosting. Blade servers are hot swappable, i.e. if you put more pressure on them like adding more users more processing power it will work with more diverse workload. 1RU (one rack unit) is the minimum possible size of any equipment in a standard server-rack configuration. When relating Cloud Computing to Blade Servers biggest advantage is lifting the restriction of the least size requirements. 42U is the most common size of computer rack and in restricts computer devices in a rack with only 42 components. Blade servers on the other hand don’t have any such limitation and can hold up to 128 components per server rack. Only two things are required by computer server that are:
- Memory for reading data and input commands
- Processor in order to control the data
- Data storage program
All the above requirements are necessary if a computer is working real hard. However in Blade Servers most of these are removed, they are either virtualized, with the help of remote console over IP or iSCSI storage, or they are included in the Blade enclosure and lastly they are completely discarded. As a result Blade Servers becomes infinitely easy and cheaper and smaller for the manufacturer. Many of the non-core computing services which are found in most of the computers, are performed by the enclosure of the Blade servers. Requirements of the non-blade servers is vast and looks useless, like spacious, bulky and inefficient components. Power supply to the blade enclosure is provided by a single power source to all the blades in the enclosure. Single power supply is mostly a dedicated separated PSU supplying DC to the multiple enclosures. A number of UPS can be reduced by applying the dedicated UPSsystem, which are otherwise required for the flexible power supply. Because of the popularity of the Blade servers demand for rack mounted UPS has gone considerably up.
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