Rebirth-FTL: Lifetime Optimization via Approximate Storage for NAND Flash

被引：2
作者：
Han, Lei [1 ]
Amrouch, Hussam [2 ]
Shao, Zili [3 ]
Henkel, Jorg [2 ]
机构：
[1] Hong Kong Polytech Univ, Hong Kong, Peoples R China
[2] Karlsruhe Inst Technol, Karlsruhe, Germany
[3] Chinese Univ Hong Kong, Hong Kong, Peoples R China
来源：
2019 IEEE NON-VOLATILE MEMORY SYSTEMS AND APPLICATIONS SYMPOSIUM (NVMSA-2019) | 2019年
关键词：
NAND flash; FTL; lifetime; approximate storage;
D O I：
10.1109/nvmsa.2019.8863527
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
The lifetime of NAND flash cells significantly degrades with feature-size reductions and multi-level cell technology. On the other hand, we have more and more approximate data such as images and video that can tolerate errors. In this paper, we propose Rebirth-FTL which reuses faulty blocks to store approximate data for the lifetime optimization. Rebirth-FTL efficiently and effectively manages two spaces with approximation-aware address mapping, coordinated garbage collection and differential wear leveling. We also develop a scheme to pass approximate information from userland to kernel space in Linux. Evaluation results show that Rebirth-FTL can significantly increase the lifetime by up to 3.46X.
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页数：6
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