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Refresh Frequency Reduction of Data Stored in SSDs Based on A-timer and Timestamps

Authors
  • Seif, Marcelino
  • Farjallah, Emna
  • Badets, Franck
  • Layer, Christophe
  • Chabchoub, Emna
  • Armani, Jean-Marc
  • Joffre, Francis
  • Anghel, Costin
  • Dilillo, Luigi
  • Gherman, Valentin
Publication Date
May 22, 2017
Source
HAL
Keywords
Language
English
License
Unknown
External links

Abstract

Increasing the number of bits per cell and technology scaling are ways to reduce the cost per gigabyte of Flash memo- ries and solid-state drives (SSDs). Unfortunately, this trend has a negative impact on data retention time and cycling endurance. Periodic data refresh allows dealing with a reduced retention time and, implicitly, improves cycling endurance. A fixed data- refresh frequency is not optimal in the presence of a variable operating temperature since it may become unnecessarily large and alter the SSD response latency and energy consumption. Here, a flexible data-refresh methodology is proposed based on timestamps and approximations of the Arrhenius-curves em- ployed to describe the temperature impact on Flash data reten- tion. The proposed approximations can be easily implemented with the help of a processor-based solution or a proposed small module called A-timer. For an asymmetric temperature distri- bution between 30°C and 70°C, it is estimated that the refresh frequency can be reduced by more than 50× and almost 3× for failure mechanisms with activation energies of 1.1eV and 0.3eV, respectively.

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