Abstract:

With the network storage technology development，how to improve transmission performance and expand storage capacity is problem to be resolved. This paper presents VCloud Storage，a cloud storage system based on virtual host. And it can improve file transmission performance，balance the load and expand storage capacity unlimitedly. It firstly abstracts running state mathematical model of the virtual hosts，then creates integer programming model on the running state mathematical model. By implicit enumeration algorithm，it allocates virtual host to the client storage request optimally. Finally client modules and virtual host modules finish file transmission collaboratively.The experimental result shows that the model and algorithm have optimization effect significantly. VCloud Storage total throughput and average transmission rate is superior to Microsoftˊs SkyDrive storage，Tencent QQ mailbox store and a single virtual host storage. The proposed model and algorithm enhance file transmission performance and stability，and are an effective method that improves the performance of storage system in WAN network.

Key words: virtual host cluster, integer programming model, cloud storage, optimization algorithm