Abstract -We estimate the availability, reliability, and mean transaction time (response time) for repairable database configurations, centralized or distributed, in which each service component is continuously available for repair. Reliability, the probability that the entire transaction can execute properly without failure, is computed as a function of mean time to failure (MTTF) and mean tim...

Reliability analysis is an important issue in wireless sensor networks (WSNs). This paper aims to study the reliability of a data flow in event-driven wireless sensor networks with multiple sending transmission approach without acknowledgments. Initially, an event-driven wireless sensor network model is described in terms of limited node battery energy and shadowed fading channels. Then, in ord...

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

We model a gracefully degrading mul-tiprocessor soft real-time system which is subject to both dynamic (software) and static (hardware) failures, without recovery, using a Markov process. We derive the traditional reliability performance measure and meantime to failure (MTTF) of such a system with respect to both failure types and introduce a parameter, expected-deadline-missed, which is the ex...

We assume a Boolean parallel system with exponentially distributed component failure times. In order to maximize the lifetime of the system we consider a repairman with Erlang-k distributed repair time. By extending the classical exponential case k = 1 to k ≥ 2 different repair semantics arise in this context. In the case of restart repair semantics we show that a repairman should have few Erla...

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...

In this paper, Investigations have been carried out for the evaluation of reliability in three different cases i.e., if each component complex system is R, failure rates follow Weibull time distribution & Exponential and MTTF a sugar manufacturing plant by using Boolean function technique. The under consideration which consists various subsystems viz., washing, cane cutter, crushing system,...

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...

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...

Increasing computing and wireless communication capabilities will expand the role of the sensors from mere information dissemination to more demanding tasks as sensor fusion, classification, collaborative target tracking. Fault tolerance and reliability performs exclusively vital role for embedded systems, such as obscured wireless sensors, which are deployed in some applications where it is di...