Availability
Term in reliability engineering / From Wikipedia, the free encyclopedia
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%.