Abstract
Blade servers are self-contained computer
servers, designed for high density. Slim, hot swappable blade servers fit in a
single chassis like books in a bookshelf - and each is an independent server,
with its own processors, memory, storage, network controllers, operating system
and applications. The blade server simply slides into a bay in the chassis and
plugs into a mid- or backplane, sharing power, fans, floppy drives, switches,
and ports with other blade servers. Blade servers are self-contained computer
servers, designed for high density. Whereas a standard rack-mount server can
exist with (at least) a power cord and network cable, blade servers have many
components removed for space, power and other considerations while still having
all the functional components to be considered a computer .A blade enclosure
provides services such as power, cooling, networking, various interconnects and
management - though different blade providers have differing principles around
what should and should not be included in the blade itself (and sometimes in
the enclosure altogether). Together these form the blade system. In a standard
server-rack configuration, 1U (one rack unit, 19" wide and 1.75"
tall) is the minimum possible size of any equipment. The principal benefit of
and the reason behind the push towards, blade computing is that components are
no longer restricted to these minimum size requirements. The most common
computer rack form-factor being 42U high, this limits the number of discrete
computer devices directly mounted in a rack to 42 components. Blades do not
have this limitation; densities of 100 computers per rack and more are
achievable with the current generation of blade systems
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