On 27/03/12 20:06, Zooko Wilcox-O'Hearn wrote: > Where is the flaw in the reasoning? > … > The problem is the assumption that failures are independent.
No, this is the wrong way to think about it! RAID-like systems are not trying to protect against correlated failures. They are trying to protect against the subset of failures that are uncorrelated. That is, it is not necessary to assume that *all* failures are independent/uncorrelated, only that the subset that *are* is worth defending against by use of redundancy. -- David-Sarah Hopwood ⚥
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