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Sector-Disk (SD) Erasure Codes for Mixed Failure Modes in RAID Systems

Sector-Disk (SD) Erasure Codes for Mixed Failure Modes in RAID Systems Sector-Disk (SD) Erasure Codes for Mixed Failure Modes in RAID Systems JAMES S. PLANK, University of Tennessee MARIO BLAUM, IBM Almaden Research Center Traditionally, when storage systems employ erasure codes, they are designed to tolerate the failures of entire disks. However, the most common types of failures are latent sector failures, which only affect individual disk sectors, and block failures which arise through wear on SSD's. This article introduces SD codes, which are designed to tolerate combinations of disk and sector failures. As such, they consume far less storage resources than traditional erasure codes. We specify the codes with enough detail for the storage practitioner to employ them, discuss their practical properties, and detail an open-source implementation. Categories and Subject Descriptors: D.4.3 [Operating Systems]: File Systems Management--File organization; D.4.5 [Operating Systems]: Reliability; E.4 [Coding and Information Theory]: Error control codes General Terms: Algorithms, Design, Reliability, Theory Additional Key Words and Phrases: Erasure codes, RAID, storage systems, sector failures, fault tolerance ACM Reference Format: Plank, J. S. and Blaum, M. 2014. Sector-disk (SD) erasure codes for mixed failure modes in RAID systems. ACM Trans. Storage 10, 1, Article 4 (January 2014), 17 pages. DOI:http://dx.doi.org/10.1145/2560013 1. INTRODUCTION Storage systems have http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png ACM Transactions on Storage (TOS) Association for Computing Machinery

Sector-Disk (SD) Erasure Codes for Mixed Failure Modes in RAID Systems

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Publisher
Association for Computing Machinery
Copyright
Copyright © 2014 by ACM Inc.
ISSN
1553-3077
DOI
10.1145/2560013
Publisher site
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Abstract

Sector-Disk (SD) Erasure Codes for Mixed Failure Modes in RAID Systems JAMES S. PLANK, University of Tennessee MARIO BLAUM, IBM Almaden Research Center Traditionally, when storage systems employ erasure codes, they are designed to tolerate the failures of entire disks. However, the most common types of failures are latent sector failures, which only affect individual disk sectors, and block failures which arise through wear on SSD's. This article introduces SD codes, which are designed to tolerate combinations of disk and sector failures. As such, they consume far less storage resources than traditional erasure codes. We specify the codes with enough detail for the storage practitioner to employ them, discuss their practical properties, and detail an open-source implementation. Categories and Subject Descriptors: D.4.3 [Operating Systems]: File Systems Management--File organization; D.4.5 [Operating Systems]: Reliability; E.4 [Coding and Information Theory]: Error control codes General Terms: Algorithms, Design, Reliability, Theory Additional Key Words and Phrases: Erasure codes, RAID, storage systems, sector failures, fault tolerance ACM Reference Format: Plank, J. S. and Blaum, M. 2014. Sector-disk (SD) erasure codes for mixed failure modes in RAID systems. ACM Trans. Storage 10, 1, Article 4 (January 2014), 17 pages. DOI:http://dx.doi.org/10.1145/2560013 1. INTRODUCTION Storage systems have

Journal

ACM Transactions on Storage (TOS)Association for Computing Machinery

Published: Jan 1, 2014

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