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A single point of failure (SPOF) is a part of a system that, if it fails, will stop the entire system from working.〔1: Designing Large-scale LANs – Page 31, K. Dooley, O'Reilly, 2002〕 SPOFs are undesirable in any system with a goal of high availability or reliability, be it a business practice, software application, or other industrial system. ==Overview== Systems can be made robust by adding redundancy in all potential SPOFs. For instance, the owner of a small tree care company may only own one wood chipper. If the chipper breaks, he may be unable to complete his current job and may have to cancel future jobs until he can obtain a replacement. Redundancy can be achieved at various levels. For instance, the owner of the tree care company may have spare parts ready for the repair of the wood chipper, in case it fails. At a higher level, he may have a second wood chipper that he can bring to the job site. Finally, at the highest level, he may have enough equipment available to completely replace everything at the work site in the case of multiple failures. The assessment of a potential SPOF involves identifying the critical components of a complex system that would provoke a total systems failure in case of malfunction. Highly reliable systems should not rely on any such individual component. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Single point of failure」の詳細全文を読む スポンサード リンク
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