From N-Tron
The definition of availability is the probability that a device will perform a required function without failure under defined conditions for a defined period of time. Before a system's availability can be determined, a device's availability must be understood. It is important to keep in mind that every device will have a probability of failure.
There are two main factors that are involved in the calculation of availability: Mean Time Between Failure (MTBF) and Mean Time To Repair (MTTR). MTBF is obtained from the data sheets of the equipment. MTTR is the average time to fix and restore the device in order to be put back into service.
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Topics of Interest
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