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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 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 SSDs. 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. 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

ACM Transactions on Storage (TOS) , Volume 10 (1): 17 – Jan 1, 2014

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Publisher
Association for Computing Machinery
Copyright
Copyright © 2014 ACM
ISSN
1553-3077
eISSN
1553-3093
DOI
10.1145/2560013
Publisher site
See Article on Publisher Site

Abstract

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 SSDs. 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.

Journal

ACM Transactions on Storage (TOS)Association for Computing Machinery

Published: Jan 1, 2014

Keywords: Erasure codes

References