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Availability

Not to be confused with Availability (thermodynamics) or Availability heuristic.
"Available" redirects here. For other uses, see Available (disambiguation).

In reliability engineering, the term availability has the following meanings:

  • The degree to which a system, subsystem or equipment is in a specified operable and committable state at the start of a mission, when the mission is called for at an unknown, i.e. a random, time.
  • The probability that an item will operate satisfactorily at a given point in time when used under stated conditions in an ideal support environment.

Normally high availability systems might be specified as 99.98%, 99.999% or 99.9996%.

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