Optimal rejuvenation for tolerating soft failures

Abstract

In the paper we address the problem of determining the optimal time to rejuvenate a server software when it experiences soft failures (witnessed in telecommunication systems) because of aging.In such a system, it is assumed that crash failures do not occur.However, the service rate of the software gradually decreases with time and settles to a very low value.Since the performability in this state is very low, it is necessary to \renew" the software to its peak performance level.We optimize the performance of this system for two di erent queueing policies under Poisson arrivals and decreasing service rate.