 | It has been suggested that Unavailability be merged into this article. (Discuss) Proposed since October 2024. |
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%.