Lifetime-aware FTL to improve the lifetime and performance of solid-state drives

• Published in: Future generation computer systems Vol. 93; pp. 58 - 67
• Main Authors: Pan, Yubiao, Li, Yongkun, Zhang, Huizhen, Xu, Yinlong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2019
• Subjects: Compression; Endurance; Lifetime-aware FTL; Solid-state drives; Compression; Endurance; Lifetime-aware FTL; Performance; Solid-state drives
• ISSN: 0167-739X; 1872-7115
• DOI: 10.1016/j.future.2018.10.011

Data compression techniques have been deployed in SSDs to prolong their lifetime due to the good tradeoff between data reduction and performance degradation. However, existing schemes either consume plenty of DRAM resources, or cause the read amplification problem, which may further result in significant performance degradation. In this paper, we propose a lifetime-aware FTL scheme (LAFTL) to improve both the lifetime and performance of SSDs by compressing several pages into one physical page. We then design a compression-aware page mapping table (PMT) to reduce the memory consumption, and propose a latency-aware approach to improve the performance. We conduct extensive trace-driven evaluations based on real-world workloads, and results show that our LAFTL reduces the average response time of reads by 3%–78% and ensures a minimal resource consumption in DRAM while obtaining an acceptable data reduction rate compared to other schemes. •A compression-aware PMT achieves less memory cost compared with existing schemes.•A latency-aware read approach is proposed to address the read amplification problem.•A latency-aware write approach is proposed to further improve the performance.