On Latency of a Backup System

P. Pochec and W. Mardini (Canada)

Keywords

fault tolerance, parallel and distributedsystem modelling, queueing theory.

Abstract

Backup system latency is a serious problem in real time FT systems. We propose an analytical model of a dual processor system (mirroring) that explains and quantifies random delays in response time of the backup system. The proposed queueing model accounts for Poissonian demand, and random and constant processing times. The model permits to balance the cost (speed) of the backup system and the expected backup system latency.

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