Three computers together provide a replicated service. The manufacturers claim that each
computer has a mean time between failure of five days; a failure typically takes four hours to fix.
What is the availability of the replicated service?

What will be an ideal response?


The probability that an individual computer is down is 4/(5*24 + 4) ~ 0.03. Assuming failure-independence of
the machines, the availability is therefore 1 – 0.033= 0.999973.

Computer Science & Information Technology

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Computer Science & Information Technology