DCStore: A Deduplication-Based Cloud-of-Clouds Storage Service

The increasing popularity of cloud storage is leading many organizations to move their data into the cloud. However, putting all data in one cloud causes problems such as vendor lock-in, increased service costs, and data availability. In this paper, we introduce DCStore, a Cloud-of-Clouds storage service designed for an organization to outsource their data into the clouds. To achieve the goal of cost-efficient and high-available, we combine three key techniques. First, DCStore eliminates the redundant data at client-side to save storage cost via application-aware chunking method. Second, DCStore uses an inner-chunk based erasure coding scheme to distribute unique chunks across multiple clouds for high availability. Finally, a container-based share management strategy is used for performance optimization. Our experimental evaluations show that DCStore can improve the performance and cost efficiency significantly, compared with existing Cloud-of-Clouds storage systems.