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