QoS-aware replica placement for data grid considering economic benefit

Replica placement is an important technology in data grid to increase data availability and reduce access cost. Existing methods to resolve QoS-aware replica placement problem are only based on obtaining the minimal system cost. This paper further investigates the influence of economic benefit to QoS-aware replica placement problem and proposes a multi-objective optimization model. Also, an optimization algorithm based on genetic algorithm is presented. At last, a numerical experiment is given, and the result indicates that multi-objective optimization model presented in this paper can find better solution than the signal-objective optimization model.