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A comment on Amazon S3 Introduces Reduced Redundancy Storage (2x vs 3x). Parent comment

Re:Amazon S3 Introduces Reduced Redundancy Storage (2x vs 3x) by gduffy on Wednesday May 19, 2010 @03:54AM (#1360400)
Inexact at best, but ..

  P(3 locations failing) = 1-0.99999999999

  P(1 location failing) = P(3 locations failing)^(1/3) = 0.000215443475

  P(2 locations failing) = P(1 location failing)^2 = 0.999569159
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