This paper presents a prediction model for software service availability measured by the mean-time-to-repair (MTTR) and mean-time-to-failure (MTTF) of a service. The prediction model is based on the experimental identification of probability distribution functions for variables that affect MTTR/MTTF and has been implemented using a framework that we have developed to support monitoring and pred...

Aircraft is a system that requires high reliability levels throughout flights. Preventive maintenance procedures are applied to maintain this reliability at an optimum level. The higher frequency of preventive maintenance applications means higher reliability level; however, very frequent application of preventive maintenance is not economical though. In order to obtain optimum benefit, this ma...

A single point of failure (SPOF) in system operations is a weak point of system reliability. Mean time to failure (MTTF) of system operations is equal to the shortage component’s MTTF in system. A Tier IV data center is designed to eliminate the SPOF. Data center system reliability is not only depended on the MTTF of each component in the system, but also relies on the mean time to repair (MTTR...

Degradation analysis is used to analyze the useful lifetimes of systems, their failure rates, and various other system parameters like mean time to failure (MTTF), mean time between failures (MTBF), and the system failure rate (SFR). In many systems, certain possible parallel paths of execution that have greater chances of success are preferred over others. Thus we introduce here the concept of...

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...

When P2P systems are used for data sensitive systems, the data availability has become an important issue. The availabilitybased replication using individual node availability is the most popular method keeping high data availability efficiently. However, since the individual node availability is derived by the individual lifetime information of each node, the availability-based replication may...

We study the reliability and sensitivity analysis of a system with M operating machines, S warm standbys, and a repairable service station. Failure times and service times of each machine (operating or standby) are assumed to be exponentially distributed. While the service station is working, it is subject to breakdowns according to a Poisson process. When the station breaks down, it requires ...

Abstract The average lifetime or the mean time to failure (MTTF) of a product is an important metric measure reliability. Current methods evaluating MTTF are mainly based on statistics data. They need testing number products get samples, which then used estimate MTTF. testing, however, expensive in terms both and cost. efficiency also low because it cannot be effectively incorporated early desi...