Profit Comparisons of Computer System with S/w Redundancy Subject to Preventive Maintenance Concept

In this paper, author focus on the profits of a computer system with software redundancy by introducing the concept of hardware preventive maintenance (PM), priority to hardware PM and hardware repair over software up-gradation.The system fails independently from normal mode.All the repair activities such as hardware repair, software up-gradation, hardware preventive maintenance before failure and hardware replacement after maximum repair time are carried out by a single server immediately, if required.All random variables are statistically independent.The negative exponential distribution is taken for the failure time of the component while the distributions of repair time, up-gradation time, preventive maintenance and replacement time are assumed arbitrary with different probability density functions.Semi-Markov process and regenerative point technique are used for obtaining the values of various parameters.The behaviour of profits has been examined.