Abstract:

Cloud storage systems provide Web Service API,file-based API,block-based API and other API to transfer and manage file over the WAN.But it's necessary to install client programs to call the API.It was found that if many people transferred files at the same time,failure rate was higher in the experiments.This paper designed the file transfer protocol VCFTP based on Web Service,HTTP and Flash technology,and realized VCloudStorage,a cloud storage system based on virtual host.First of all,SaaS service model was established,and virtual host storage interfaces were created by the HTTP data stream storage technology.And it established the model of virtual host transmission,storage and price capacity,then created integer programming model and presented optimization algorithm based the virtual host transmission model and users transmission requests.Finally,transmission control protocol VCFTP was created.Using Flash's cross-platform and rich client technology features,VCFTP could transfer and manager files without installing other programs in the client.Authorized users could transfer files by optimization transmission capacity way in accordance with the transmission request,the storage requirements,service levels and the virtual host current state,etc.The experimental results showed that the VCFTP have high performance and stability,and total throughput,average transmission rate and file transmission success rate of VCloudStorage is superior to Microsoft's SkyDrive storage,Tencent QQ mailbox store and a single virtual host storage.The VCFTP protocol enhances file transmission performance and stability,and is an effective way that improves the performance of storage system in WAN.

Key words: VcloudStorage, VCFTP, file transfer protocol, cloud storage, virtual host cluster, integer programming model