부산대학교 도서관

We describe the development of a stochastic model for a computer system with cold standby redundancy, priority and failure of service facility. A computer system (called a single unit) means the simultaneous working of its hardware and software components. The system has one more unit (called computer system) that can be used as and when required at the failure of any of the hardware/software components of the initially operative computer system. A single repair facility is made available to rectify the faults which occur due to the failure of hardware and software components. The failed hardware component undergoes for repair immediately while failed software is up-graded. The service facility is subjected to failure during hardware repair. The provision of perfect treatment has been made for the failed service facility. The components work as new after repair and up-gradation with the same life time distribution. The priority is given to the software up-gradation over the hardware repair. In steady state, the expressions for some important reliability measures have been derived using the well known semi-Markov process and regenerative point technique. The behavior of some useful reliability characteristics has been observed for particular values of the parameters related to failure times, repair and up-gradation times and treatment time which follow negative exponential distribution. [ABSTRACT FROM AUTHOR]