11.5 Reliability measurement

To assess the reliability of a system, you have to collect data about its operation. The data required may include:

  1. The number of system failures given a number of requests for system services. This is used to measure the POFOD and applies irrespective of the time over which the demands are made.

  2. The time or the number of transactions between system failures plus the total elapsed time or total number of transactions. This is used to measure ROCOF and MTTF.

  3. The repair or restart time after a system failure that leads to loss of service. This is used in the measurement of availability. Availability does not just depend on the time between failures but also on the time required to get the system back into operation. ...

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