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Reliability is a measure of the system’s capability of providing correct services continuously for a period of time. It is often represented as the probability for the system to do so for a given period of time t, i.e., Reliability = R(t). The larger the t, the lower the reliability value. The reliability of a system is proportional to MTTF. The relationship between reliability and availability can be represented as . Reliability is very different from availability. If a system fails frequently but can recover very quickly, the system may have high availability. However, such a system would have very low reliability.