Availability Management in Data Grid

摘要

The data grids are highly distributed environments where nodes are geographically distributed across the globe and shared data are generally very large. The use of replication techniques ensure better availability and easy access to data handled in the grids. In this article, we propose a dynamic replication strategy based on availability and popularity, this replication takes into account failures in the system. The minimum degree of replication is specified by a certain probability of availability and the maximum degree is controlled by the popularity of the data, we introduced also the concept of dynamic primary replica that is used to ensure availability without increasing recovery time. We show in this article that the proposed strategy improves the availability of data according to its popularity and at the same time it improves system performance.