AvaliaÃÃo do impacto de uma polÃtica de manutenÃÃo na performabilidade de sistemas de transferÃncia eletrÃnica de fundos

AUTOR(ES)

Erica Teixeira Gomes de Sousa

DATA DE PUBLICAÇÃO

2009

RESUMO

The transfer electronic funds systems (EFT) promote financial benefits to institutions that utilize this kind of service and conveniences for its clients. EFT systems realize credit and debit operations in bank accounts through points of sales terminals (POSs) in different companies. This way, analyzing the performance of the EFT systems has a fundamental importance to companies that promote the service of transferring electronic funds, where the computational resources should be efficiently used with the objective of meeting the requirements defined in the service level agreements (SLA). The occurrence of fault events can lead to a severe degradation in the efficiency of systems. This way, the modeling results of systems are incomplete or imprecise without considering the dependability effects on performance. This work presents a methodology for performability evaluation composed of a method for evaluating performance, one for evaluating dependability and a decomposition and composition technique. This work also presents two expolinomial stochastic models for performability evaluation, which are the performance and dependability model of EFT systems. The EFT system performance model provides the performance evaluation of processing and storage resources of the EFT server taking the workload (credit and debit commercial transactions) variations into consideration. The EFT system dependability model promotes the evaluation of the fault events effects and maintenance policy in the availability and reliability of the EFT systems infrastructure. The performance and dependability models are combined for evaluation the impact of dependability in the performance of EFT systems. The maintenance policy is employed for preventing fault events in EFT systems and permits its recuperation so as to ensure the performance expectations of clients through adjustment of the intervals between preventive maintenance, intervals between replacement of equipments, maximum number of preventive maintenance before replacement of equipaments, mean time to repair, maintenance team sizing and related costs. Case studies are presented in order to evaluate the impacts of workload variation on the performance of EFT systems, the impacts of maintenance policy on the performability of EFT systems and also to evaluate the effects of temperature variation on performability of EFT systems.

ASSUNTO(S)

sistemas distribuidos dependability evaluation polÃtica de manutenÃÃo ciencia da computacao avaliaÃÃo de performabilidade maintenance policy electronic funds transfer system stochastic petri nets performance evaluation redes de computadores performability evaluation expolinomial stochastic models

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