Availability optimization in operational software system with aperiodic time-based software rejuvenation scheme

This paper discusses an aperiodic time-based rejuvenation policy maximizing the steady-state system availability in operational software system. Under a fixed periodic checkpoint schedule, we develop an algorithm to derive the optimal aperiodic rejuvenation times based on dynamic programming. In numerical examples, the optimal rejuvenation time and its maximum availability are illustrated in the case where the system failure obeys the Weibull distribution.