A Load Balancing Strategy for Replica Consistency Maintenance in Data Grid Systems

In data grid environment, the management of shared data is one of the major scientific challenges. Data replication is one of the important techniques used in grid systems to increase the availability, scalability and fault tolerance. However, the update of a replica might bring a critical problem of replica consistency maintenance. Thus, maintaining the consistency of the replicas is not trivial because of the instability of the grid system where the nodes can join and leave at any time. In addition, according to Read/Write access frequency some nodes can be more uploaded than others and become a bottleneck. In order to handle these problems, we propose a model of consistency based on quorum protocol. The replica consistency performances are improved by using a dynamic load balancing strategy in a simulated grid environment. Povzetek: Članek govori o ohranjanju konsistentnosti kopij podatkov v omrežnem računalništvu in predlaga nov model, ki temelji na protokolu sklepčnosti.