Dynamic Reliable Replica Location Method in Data Grids

Data grids provide geographically distributed resources for large-scale data-intensive applications that generate large data sets.So,it is often desirable to create remote read-only copies(replicas) of files.However,ensuring efficient and fast access to all replicas of a file is a challenging problem for us now. To address this problem,a Dynamic Reliable Replica Location(DRRL) method is proposed in this article.In DRRL,Territory Supper Nodes(TSN) are defined to support locating multiple replicas of the same data element efficiently.DRRL can adapt to the joining or departing of TSN freely.Analysis and experiments show that DRRL can achieve reliability,adaptability and ease of implementation.