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SSD-based RAID-6 System Architecture for Reliability and Performance Enhancement  

Song, Jae-Seok (Department of Electronic Engineering, Inha University)
Huh, Joon-Moo (Department of Electronic Engineering, Inha University)
Yang, Yu-Seok (Department of Electronic Engineering, Inha University)
Kim, Deok-Hwan (Department of Electronic Engineering, Inha University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea CI / v.47, no.6, 2010 , pp. 47-56 More about this Journal
Abstract
HDD-based RAIDs have been used in high-capacity storage systems for traditional data server. However, their data reliability are relatively low and they consume lots of power since hard disk drive is weak on shock and its power consumption is high due to frequent spindle motor operation. Therefore, this paper presents new SSD based RAID system architecture using various erasure codes. The proposed methode applys Reed-Solomon, EVENODD, and Liberation coding schemes onto file system level and device driver level, respectively. Besides, it uses data allocation method to minimize the side effect of reducing the lifespan of SSD. Detail experimental results show that Liberation code increase wear-leveling rates of SSD based RAID-6 more than other codes. The SSD based RAID system applying erasure codes at the device driver level shows better performance than that at the file system level. I/O performance of RAID-6 system using SSD is 4.5%~8.5% higher than that of using HDD and the power consumption of the RAID system using SSD is 18%~40% less than that of using HDD.
Keywords
erasure code; multiple device driver; ssd; raid-6;
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