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blade server
A blade server is a stripped down server computer with a modular design optimized to minimize the use of physical space and energy. Whereas a standard rack-mount server can function with (at least) a power cord and network cable, 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.
〔(【引用サイトリンク】title=Data Center Networking – Connectivity and Topology Design Guide )〕 Unlike a rack-mount server, a blade server needs a blade enclosure. A blade enclosure, which can hold multiple blade servers, provides services such as power, cooling, networking, various interconnects and management. Together, blades and the blade enclosure form a blade system (although BladeSystem from Hewlett-Packard is a specific product name). Different blade providers have differing principles regarding what to include in the blade itself, and in the blade system altogether.
In a ''standard'' server-rack configuration, one rack unit or 1U— wide and tall—defines the minimum possible size of any equipment. The principal benefit and justification of blade computing relates to lifting this restriction so as to reduce size requirements. 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. Blades do not have this limitation. , densities of up to 180 servers per blade system (or 1440 servers per rack) are achievable with blade systems.
== Blade enclosure ==
Enclosure (or chassis) performs many of the non-core computing services found in most computers. Non-blade systems typically use bulky, hot and space-inefficient components, and may duplicate these across many computers that may or may not perform at capacity. By locating these services in one place and sharing them between the blade computers, the overall utilization becomes higher. The specifics of which services are provided may vary by vendor.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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