In this paper, we focus on the reliability and performance analysis of Computer Centre (CC) at Yobe State University, Damaturu, Nigeria. The CC consists of three servers: one database mail server, one redundant and one for sharing with the client computers in the CC (called as a local server). Observing the different possibilities of the functioning of the CC, the analysis has been done to eval...

ABSTRACT This paper Study the reliability and availability characteristics of the system with PM and CCF. The failure times , replacement times, PM times and CCF times of a components are assumed to be exponentially distributed. We derive the mean time to failure( MTTF) and the steady state availability( ) in this system. Some Special cases have been studies theoretically and graphically to obs...

The effect of supervisory control on a redundant database unit representing a command and control (C2) system that supports air operations is investigated through simulation. Several supervisory control policies are considered. They authorize restoration and/or routing upon the failure of a server in the system. The performance of the modeled system under these policies is evaluated based on th...

............................................................................................................................................. 2 Overview of the RAID 5 rebuild process ................................................................................................. 2 Estimating the mean-time-to-failure (MTTF) ..........................................................................

Software reliability is an important aspect in software engineering enviourment. Software reliability is introduced as failure free operation in specified enviourment. Various studies show that the software reliability is defined in three categories that are improvement, modelling and measurement. In this paper, we will study the reliability metrics to improve the software reliability. Reliabil...

The mean time to failure (MTTF) of a Markovian system can be expressed as a ratio of two expectations. For highly reliable Markovian systems, the resulting ratio formula consists of one expectation that cannot be estimated with bounded relative error when using standard simulation, while the other, which we call a non-rare expectation, can be estimated with bounded relative error. We show that ...

Pumping systems are an integral part of water desalination plants, their effective functioning is vital for the operation of a plant. In this research work, the reliability and availability of pressurized pumps in a reverse osmosis desalination plant are studied with the objective of finding configurations that provides optimal performance. Six configurations of a series system with different n...

One of the most important problems of reliability analysis is to estimate the mean lifetime of the item under study. In technical applications this parameter is also called the mean time to failure (MTTF) and is often included in the specification of a product. For example, producers are interested whether this time is sufficiently large, as a large MTTF allows them to extend a warranty time. C...

Bit faults induced by single-event upsets in instruction may not cause a system to experience an error. The instruction vulnerability factor (IVF) is first defined to quantify the effect of non-effective upsets on program reliability in this paper; and the mean time to failure (MTTF) model of program memory is then derived based on IVF. Further analysis of MTTF model concludes that the MTTF of ...