Power consumption of storage systems can not be ignored any more with the increment of the scale of storage systems, and the research in energy-saving of storage systems becomes more important. A data layout for storage systems in order to reduce power consumption is proposed in this paper: Hybrid S-RAID (HS-RAID). HS-RAID includes two parts: one is RAID 1 which is composed of two SSDs, and the other is S-RAID that is composed of a group of hard disks. Hard disks are grouped in S-RAID, and parallel in the group. Remapping the random I/O requests on the RAID 1, sequential data I/O write on the S-RAID by the group order. When only one group of hard disks are busy under continuous data access mode, the others can be shut down or put into standby mode for energy-saving because of no requests on them. That can save energy in HS-RAID and only increases the cost of the storage system slightly. HS-RAID is designed for applications whose I/O characteristics are sequential access. Experiment shows that the HS-RAID with 12 hard disks and 2 SSDs consumes 28% power of such a RAID 5 system.%存储系统规模的日益增大,其高能耗成为一个无法忽视的问题,因此对存储系统的节能研究十分重要.提出一种由SSD固态盘与普通磁盘组成的混合S-RAID结构,通过关闭部分处于空闲状态的磁盘,达到节能效果.混合S-RAID将包括超级块在内的少量随机读写数据放在由SSD组成的RAID1中,将连续数据放在由普通磁盘组成的S-RAID中,S-RAID对磁盘分组,连续数据访问模式下只有一个组处于活动状态,关闭处于空闲状态的磁盘组.在仅增加少量成本的前提下,提高了存储系统的节能效果.混合S-RAID适用于各种以连续数据访问为主要特征的应用环境.实验表明,由12块普通磁盘和两块SSD固态盘组成的混合S-RAID 5与同级别RAID 5相比,能耗仅为RAID 5的28％.
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