Recently, the research about deduplication technology is focus on how to save the disk space and decrease the chunking index table’s size but not performance analysis when this technology is integrated into the storage system. In this paper, we present the classification of various deduplication technologies for storage and compare these different categories then develop the architecture and process flow for the online storage service. The analytical model is developed to description and calculation of storage performance, including the deduplication ratio, system throughput and energy savings. The results analyzed on the model are encouraging, and indicating that the model provides the accurate performance.