Optimum Preventive Maintenance Policies for a Computer System with Restart

This paper considers a computer system where an operation is restarted when the system stops on some faults. The restart does not succeed every time. Three preventive maintenance (pm) models are considered: A) The pm is made at the scheduled time T. B) The pm is made at the K-th successful restart. C) The pm is made at the next scheduled time if the total number of successes of restart exceeds K. The availabilities of each model are obtained and the optimum pm policies are discussed.