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Dynamic Erase Voltage and Time Scaling for Extending Lifetime of NAND Flash-Based SSDs

Title
Dynamic Erase Voltage and Time Scaling for Extending Lifetime of NAND Flash-Based SSDs
Authors
Jeong, JaeyongSong, YoungsunHahn, Sangwook ShaneLee, SungjinKim, Jihong
DGIST Authors
Lee, Sungjin
Issue Date
2017-04
Citation
IEEE Transactions on Computers, 66(4), 616-630
Type
Article
Article Type
Article
Keywords
SCHEMEMEMORY
ISSN
0018-9340
Abstract
The decreasing lifetime of NAND flash memory, as a side effect of recent advanced semiconductor process scaling, is emerging as one of major barriers to the wide adoption of SSDs in high-performance computing systems. In this paper, we propose Dynamic Erase Voltage and Time Scaling (DeVTS), an integrated approach to extend the lifetime (particularly, endurance) of NAND flash memory. DeVTS is motivated by our key observation that erasing a NAND block with a lower voltage or at a slower speed can significantly improve NAND endurance. However, using a lower erase voltage causes adverse side effects on the write performance and retention capability of NAND flash memory. In order to improve NAND endurance without affecting the other NAND requirements, we take advantage of idle times between write requests and variations of the retention requirement when writing data to a NAND block erased with a lower voltage. We have implemented a DeVTS-aware FTL, called dvsFTL, which exploits the tradeoff relationship between the endurance and erase voltages/times by accurately predicting the write performance and retention requirements. Our experimental results show that dvsFTL can improve NAND endurance by 94 percent, on average, over an existing DeVTS-unaware FTL while all the NAND requirements are preserved. © 2016 IEEE.
URI
http://hdl.handle.net/20.500.11750/6536
DOI
10.1109/TC.2016.2615038
Publisher
IEEE COMPUTER SOC
Related Researcher
  • Author Lee, Sungjin Data-Intensive Computing Systems Laboratory
  • Research Interests Computer System, System Software, Storage System, Non-volatile Memory, Flash-based SSD, Distributed Storage Systems
Files:
There are no files associated with this item.
Collection:
Department of Information and Communication EngineeringData-Intensive Computing Systems Laboratory1. Journal Articles


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