{"title":"Rebirth-FTL: Lifetime optimization via Approximate Storage for NAND Flash","authors":"Lei Han, H. Amrouch, Z. Shao, J. Henkel","doi":"10.1109/NVMSA.2019.8863527","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":438544,"journal":{"name":"2019 IEEE Non-Volatile Memory Systems and Applications Symposium (NVMSA)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2019 IEEE Non-Volatile Memory Systems and Applications Symposium (NVMSA)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NVMSA.2019.8863527","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
Abstract
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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