出版社
ASSOC COMPUTING MACHINERY
DOI: 10.1145/3316781.3317929
关键词
SSDs; Superblock; Wear Tolerance Variation; Wear-based Garbage Collection; Lifetime
资金
- NSFC [61872413, U1709220, 61821003]
- Wuhan Science and technology Project [2017010201010108]
- Shenzhen basic research project [JCYJ20170307160135308, JCYJ20170818162129916]
- National Key Research and Development Program of China [2018YFB10033005]
- Fundamental Research Funds for the Central Universities [2016YXMS019]
- 111 Project [B07038]
- Key Laboratory of Data Storage System, Ministry of Education
Superblocks are widely employed in SSDs for improving performance. However, the standard superblock organization which links blocks with the same block ID across planes into one superblock leads to SSDs' ineluctable lifetime waste due to inter-block wear tolerance variations. This work proposes a wear-aware superblock management, called WAS, which (1) dynamically organizes superblocks according to real-time block wear levels to make strong blocks relieve wear on weak ones, and (2) employs a wear-based garbage collection scheme to reduce inter-block wear gap. Comprehensive experiments are carried out in SSDsim. Results show that WAS greatly prolongs SSD lifetime by 51.3% compared with the state-of-the-art superblock management.
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