The blade enclosure's power supply provides a single power source for all blades within the enclosure. To ensure that the failure of one power source does not affect the operation of the computer, even entry-level servers may have redundant power supplies, again adding to the bulk and heat output of the design. Converting this current requires one or more power supply units (or PSUs). HP BladeSystem c7000 enclosure (populated with 16 blades), with two 3U UPS units below Power Ĭomputers operate over a range of DC voltages, but utilities deliver power as AC, and at higher voltages than required within computers. As of 2014, densities of up to 180 servers per blade system (or 1440 servers per rack) are achievable with blade systems. The most common computer rack form-factor is 42U high, which limits the number of discrete computer devices directly mountable in a rack to 42 components.
The principal benefit and justification of blade computing relates to lifting this restriction so as to reduce size requirements. In a standard server-rack configuration, one rack unit or 1U-19 inches (480 mm) wide and 1.75 inches (44 mm) tall-defines the minimum possible size of any equipment.
Different blade providers have differing principles regarding what to include in the blade itself, and in the blade system as a whole. Together, blades and the blade enclosure form a blade system, which may itself be rack-mounted. Unlike a rack-mount server, a blade server fits inside a blade enclosure, which can hold multiple blade servers, providing services such as power, cooling, networking, various interconnects and management.
Blade servers have many components removed to save space, minimize power consumption and other considerations, while still having all the functional components to be considered a computer. Server computer that uses less energy and space than a conventional serverĪ blade server is a stripped-down server computer with a modular design optimized to minimize the use of physical space and energy.
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