关键词: 云计算, 云存储系统, 绿色计算, 能耗效率

Abstract: Cloud storage system as an important component of cloud computing is the foundation of all kinds of cloud computing services. However, with the expanding of its scale and the energy cost factors being ignored by its designers, the problem of high energy cost and low efficiency is exposed. Cloud storage system consumes roughly 27%~40% of the total cloud computing centers energy cost, so the research on energy saving technology of cloud storage system has great practical significance and application prospects, no matter from the point of reducing the operation cost of big data service provider or reducing energy cost to protect the environment. Firstly, this paper discusses the energy cost optimization problem of cloud storage system from two categories: energy-saving method based on hardware and energy saving method based on scheduling. Secondly, this paper divides the energy saving method based on scheduling into three aspects: the method based on node scheduling, the method based on data scheduling and the method based on cache pre-fetching technology as well, as makes a comprehensive comparison among them. Finally, this paper discusses the prospect in four directions: the cloud storage architecture which adapts to energy saving, QoS (quality of service) guarantee under energy-saving mode, the matching of energy-saving model and the calculation model, and the energy-saving research using erasure code fault-tolerant technology.

Key words: cloud computing, cloud storage system, green computing, energy-efficient