信頼性の「9」は小数点以下から数えるべき
従来の「可用性99.9%（スリー・ナイン）」のような表記は、実際の信頼性を過大評価している。記事は、信頼性の「9」を小数点以下からカウントし始めるべきだと主張。例えば「3つの9」を「0.999」ではなく「0.001」の失敗率として捉え直すことで、システムの実際の信頼性に対する誤解を防ぐことができる。
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