摘要：The present study proposes a dynamic replica management strategy based on Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) in the cloud storage system. The replica management strategy includes the replica placement algorithm and the replica number strategy. The replica placement algorithm sorts the nodes by TOPSIS according to the node performance and load, the replicas are placed in the nodes with high performance and low load. The replica number strategy designs the reliability model and the availability model to compute the number of replicas, the initial number of the replicas is decided according to the reliability model and the number of the replicas is adjusted dynamically according to the availability model. Experimental results show that the strategy in the study has better performance in response delay and load-balance than the Default Replica Management Strategy in Hadoop (DRMSH) distributed file system.
