A new energy saving storage system: SERAID for disk array
Fei Wu, Huaixiang Hu, Ke Liu · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2008
Recently, high-energy consumption has become a serious concern for both storage servers and data centers. Recent research studies have utilized the short response times of multiple speed disks to decrease energy consumption. However, very few manufactures can produce the multiple speeds hard disk because of its complexity. The main limitation to MAID system is that we must assume the frequently accessed data is less than 5%, in fact, in most strong coupling system, the data can't be cached due to the access pattern and moreover the first accessed data which are usually frequently accessed are not cached, as a result, system performance is heavily degraded. In this paper, we propose the new storage system called saving energy RAID (SERAID), in which we place the frequently accessed data into solid state disks (SSD) and place the less frequently accessed ones into conventional hard disks (CHD). Because the energy consumption is very low and the random read/write rate is very fast in SSD, we can get high availability and high saving energy RAID system at the expense of very few costs. The simulation result shows that the random write performance of SERAID is 10 times rapid than those of traditional RAID and the random read performance of SERAID is 5 times rapid than those of conventional RAID. Besides that, the mean energy consumption of SERAIDsystem is lower than that of traditional RAID.