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An Empirical Study on Linux I/O stack for the Lifetime of SSD Perspective

SSD 수명 관점에서 리눅스 I/O 스택에 대한 실험적 분석

  • 정남기 (성균관대학교 반도체디스플레이공학과) ;
  • 한태희 (성균관대학교 정보통신대학)
  • Received : 2015.06.09
  • Accepted : 2015.09.03
  • Published : 2015.09.25

Abstract

Although NAND flash-based SSD (Solid-State Drive) provides superior performance in comparison to HDD (Hard Disk Drive), it has a major drawback in write endurance. As a result, the lifetime of SSD is determined by the workload and thus it becomes a big challenge in current technology trend of such as the shifting from SLC (Single Level Cell) to MLC (Multi Level cell) and even TLC (Triple Level Cell). Most previous studies have dealt with wear-leveling or improving SSD lifetime regarding hardware architecture. In this paper, we propose the optimal configuration of host I/O stack focusing on file system, I/O scheduler, and link power management using JEDEC enterprise workloads in terms of WAF (Write Amplification Factor) which represents the efficiency perspective of SSD life time especially for host write processing into flash memory. Experimental analysis shows that the optimum configuration of I/O stack for the perspective of SSD lifetime is MinPower-Dead-XFS which prolongs the lifetime of SSD approximately 2.6 times in comparison with MaxPower-Cfq-Ext4, the best performance combination. Though the performance was reduced by 13%, this contributions demonstrates a considerable aspect of SSD lifetime in relation to I/O stack optimization.

Acknowledgement

Supported by : 정보통신기술진흥센터

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