Reliability Fundamentals
The academic definition of reliability, R(t), is the probability of a system performing its intended function over a given time period, t. For example, a system with a 0.9999 reliability over one year has a 99.99 percent probability of functioning without failures over the time period of a year.
Reliability is only one of many factors that influences availability. For example, 99.99 percent reliability does not mean 99.99 percent availability. Reliability measures the ability of a system to function without interruptions, while availability measures the ability of a system to provide a specified application service level to clients. Therefore, reliability provides a metric of how often a component is likely to fail, while ...
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