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Home » The Devil Is in the Details: Implementing Flash Page Reuse with WOM Codes
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The Devil Is in the Details: Implementing Flash Page Reuse with WOM Codes

Authors: 

Fabio Margaglia, Johannes Gutenberg—Universität; Gala Yadgar and Eitan Yaakobi, Technion—Israel Institute of Technology; Yue Li, California Institute of Technology; Assaf Schuster, Technion—Israel Institute of Technology; André Brinkmann, Johannes Gutenberg—Universität

Abstract: 

Flash memory is prevalent in modern servers and devices. Coupled with the scaling down of flash technology, the popularity of flash memory motivates the search for methods to increase flash reliability and lifetime. Erasures are the dominant cause of flash cell wear, but reducing them is challenging because flash is a write-oncemedium—memory cells must be erased prior to writing.

An approach that has recently received considerable attention relies on write-once memory (WOM) codes, designed to accommodate additional writes on write-once media. However, the techniques proposed for reusing flash pages with WOM codes are limited in their scope. Many focus on the coding theory alone, while others suggest FTL designs that are application specific, or not applicable due to their complexity, overheads, or specific constraints of MLC flash.

This work is the first that addresses all aspects of page reuse within an end-to-end implementation of a general-purpose FTL on MLC flash. We use our hardware implementation to directly measure the short and long-term effects of page reuse on SSD durability, I/O performance and energy consumption, and show that FTL design must explicitly take them into account.

Fabio Margaglia, Johannes Gutenberg—Universität

Gala Yadgar, Technion—Israel Institute of Technology

Eitan Yaakobi, Technion—Israel Institute of Technology

Yue Li, California Institute of Technology

Assaf Schuster, Technion—Israel Institute of Technology

André Brinkmann, Johannes Gutenberg—Universität

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BibTeX
@inproceedings {194418,
author = {Fabio Margaglia and Gala Yadgar and Eitan Yaakobi and Yue Li and Assaf Schuster and Andre Brinkmann},
title = {The Devil Is in the Details: Implementing Flash Page Reuse with {WOM} Codes},
booktitle = {14th USENIX Conference on File and Storage Technologies (FAST 16)},
year = {2016},
isbn = {978-1-931971-28-7},
address = {Santa Clara, CA},
pages = {95--109},
url = {https://www.usenix.org/conference/fast16/technical-sessions/presentation/margaglia},
publisher = {USENIX Association},
month = feb
}
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