This paper investigates the reliability characteristics of a complex system having nine subsystems arranged in the form of 3x3 matrix in which each row contains three subsystems. The configuration of the row is of the type 2-out-of-3: F. Each subsystem has n units connected in series. The system fails if any one row containing three subsystems fails. The considered system analyzed incorporating...

A CSS1†is a system with the continues-state components. When a component has the ability to obtain all the situations from completely working to completely failed, it named continues-state component. In the real world, performance rate of elements are continuous and decrease by time. Continuity of components causes infinite working states and grows up the system states. In this paper we propose...

Availability analysis is based on the combination of First and Second Laws of Thermodynamics. Availability is defined as the maximum amount of potential work in relation to the surrounding environment. In the present paper, availability loss method was applied to evaluate a dual-evaporator vehicle air conditioning (A/C) system in order to identify a critical component that had led to the poor s...

In recent years, there has been an increased interest in evaluating the availability and reliability of computer systems. For this purpose, we have developed a state of the art modeling package called SAVE (System Availability Estimator). This package has refined numerical matrix methods for computing the dependability measures of interest. These methods do, however, have their limitations sinc...

Workstations typically depend on remote servers accessed over a network for such services as mail, printing, storing files, booting, and time. The availability of these remote services has a major impact on the usability of the workstation. Availability can be increased by replicating the servers. In the Echo distributed file system at DEC SRC, two different replication techniques are employed,...

We consider a one-unit repairable system under continuous monitoring and a perfect repair policy, with instantaneous commencement of repair and installation to operation. For arbitrary continuous failure time and repair time distributions, we study the problems of point estimation, one-sided confidence interval estimation and hypothesis testing for the limiting availability, based on a random s...

We study the specification and the verification of availability policies. We first introduce the availability concept, and then deontic logic. Next we present some investigations about mixing temporal and deontic aspects, in order to specify both availability policies and system behavior. In the last part we focus on the verification of availability, especially using the UPPAAL tool for an illu...

In light of the increasing throughput of local area networks, Networks Of Workstations (NOW) which provide a distributed shared memory (DSM) have become a convenient alternative to parallel architectures in the framework of parallel scientific applications. ICARE is a recoverable DSM based on backward error recovery which is implemented on top of an experiments ATM platform running the CHORUS m...

Availability is a storage system property that is both highly desired and yet minimally engineered. While many systems provide mechanisms to improve availability – such as redundancy and failure recovery – how to best configure these mechanisms is typically left to the system manager. Unfortunately, few individuals have the skills to properly manage the trade-offs involved, let alone the time t...