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Reliability(Mean-Time-Between-Failures) is the probability of failure-free operation of a computer program in a specified environment for a specified time.
Availability is the probability that a program is operating according to requirements at a given point in time.
Reliability = MTTF + MTTR
Availability = MTTF/(MTTF + MTTR)
MTTF (Mean-Time-To-Failure)
MTTR (Mean-Time-To-Repair)
MTTF = system up time/number of failures
MTTR = repair time/number of repairs