Research on the strategy of FLDC replication dynamically created in cloud storage

With the development of information technology and the progress of informationization, the global data grows explosively. Confronting PB level storage requirements, traditional file systems have bottleneck on capacity and performance expansion. Cloud storage is widely acknowledged by IT industry because of its advantages, such as expandability, cost-effective, high fault-tolerance. As the basis of cloud storage, distributed file system achieves promotion of system availability and fault-tolerance by introducing data replication technology. However replica brings about a lot of problems such as bandwidth and storage consumption, unexpected data inconsistency, load balance and so on. Firstly, a distributed file system model MSFS is established as the basis of the follow-up research. Then, according to replica dynamic period, a replica dynamic creation strategy FLDC (replica dynamic creation strategy based on user access frequency and lightest load) is proposed based on users´ access frequency and node loads. The strategy obtains the hot file whose accessed number above a specific threshold and then dynamic create the copy on the lightest load node in the same zone. Comparing with the static replication strategy, the experiment results show that FLDC strategy has a better performance in load balance and access rate.