Title of article :
Reliability Enhancement of Computer Network System with Server Replication
Author/Authors :
Yusuf Department of Mathematical Sciences - Bayero University, Kano, Nigeria , Sani, B. Department of Computer Science - Bayero University, Kano, Nigeria , Umar, S.M. Department of Mathematical Sciences - Bayero University, Kano, Nigeria
Abstract :
Reliability is a performance factor applied to multi-computer network system consisting of devices such as active parallel or
redundant hosts (clients), distributed database servers with replication, and a central server. For reliability evaluation and
performance of such a system, this study analyzed a computer network system consisting of hosts (clients) connected to two
distributed database servers in replication to each other. The system is configured as a series-parallel system consisting of two
subsystems, namely A and B. Subsystem A consists of three clients in active parallel while subsystem B consists od two distributed
database servers in replication to each order. Both clients and server failure and repair time are to be exponentially distributed The
system is analyzed using first-order differential-difference equations to derive the expressions for the availability, mean time to
failure, probability of a busy period of repairman due to partial or complete failure. The results are presented in tables and graphs.
Reliability characteristics such as availability, MTTF, profit function as well as sensitivity analysis have been discussed. The
computed results are demonstrated by tables and graphs. From the analysis of reliability characteristics, it is evident that availability,
profit , and mean time to failure can be enhanced by adding more servers in replication to each other.
Keywords :
Availability , Mean Time to Failure , Network
Journal title :
International Journal of Reliability, Risk and Safety: Theory and Application