Relieving self-healing SSDs of heal storms

Li-Pin Chang, Sheng Min Huang, Kun Lin Chou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Building self-healing SSDs is proven feasible by recent studies. When the stress of a block becomes critical, it can be healed to remove part of the stress. However, with wear leveling, all blocks are evenly worn and have similar stress, and all blocks could undergo the healing process within a short period of time. The intensive heal operations, called heal storms, cause highly unpredictable I/O performance and storage reliability. Inspired by the even distribution of erase counts under wear leveling, we propose to operate wear leveling on virtual erase counts instead of real erase counts. When the balance among virtual erase counts is achieved through wear leveling, all real erase counts become evenly dispersed in a controlled interval. In this way, blocks will undergo healing at different times. Virtual erase counts are progressively adjusted such that all blocks reach their endurance limit when the SSD permanently retires. Our results show that our approach successfully resolved the heal storm problem without impacting on the SSD lifespan.

Original languageEnglish
Title of host publicationSYSTOR 2017 - Proceedings of the 10th ACM International Systems and Storage Conference
PublisherAssociation for Computing Machinery, Inc
ISBN (Electronic)9781450350358
DOIs
StatePublished - 22 May 2017
Event10th ACM International Systems and Storage Conference, SYSTOR 2017 - Haifa, Israel
Duration: 22 May 201724 May 2017

Publication series

NameSYSTOR 2017 - Proceedings of the 10th ACM International Systems and Storage Conference

Conference

Conference10th ACM International Systems and Storage Conference, SYSTOR 2017
CountryIsrael
CityHaifa
Period22/05/1724/05/17

Fingerprint Dive into the research topics of 'Relieving self-healing SSDs of heal storms'. Together they form a unique fingerprint.

  • Cite this

    Chang, L-P., Huang, S. M., & Chou, K. L. (2017). Relieving self-healing SSDs of heal storms. In SYSTOR 2017 - Proceedings of the 10th ACM International Systems and Storage Conference [5] (SYSTOR 2017 - Proceedings of the 10th ACM International Systems and Storage Conference). Association for Computing Machinery, Inc. https://doi.org/10.1145/3078468.3078476