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And some out-of-the-box thinking. Similarity is one aspect of why redundancy fails. When the Browns Ferry nuclear reactor almost melted down in the seventies, it had redundant systems. The control lines ran down the same tray. When some not-to-bright maintenance engineers were checking for leaks with a lit candle, they forgot that leaks [expletive deleted] as well as blow. The insulation caught fire at the point where the control lines lay side by side, redundant but vulnerable. Vulnerabilities are a different class of error handling which is why some Internet systems are demonstrating such poor results when under attack. len From: Nathan Young [mailto:natyoung@c...] I guess the main point is that effective redundancy should provide not just duplicate systems, but rather two or more entirely different ways of accomplishing the same thing.
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