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  1. Transactions on Storage (TOS)
  2. ACM Transactions on Storage (TOS) : Volume 6
  3. Issue 4, May 2011
  4. Online availability upgrades for parity-based RAIDs through supplementary parity augmentations
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ACM Transactions on Storage (TOS) : Volume 12
ACM Transactions on Storage (TOS) : Volume 11
ACM Transactions on Storage (TOS) : Volume 10
ACM Transactions on Storage (TOS) : Volume 9
ACM Transactions on Storage (TOS) : Volume 8
ACM Transactions on Storage (TOS) : Volume 7
ACM Transactions on Storage (TOS) : Volume 6
Issue 4, May 2011
A hybrid flash translation layer with adaptive merge for SSDs
Minimum density RAID-6 codes
Online availability upgrades for parity-based RAIDs through supplementary parity augmentations
Issue 3, September 2010
Issue 2, July 2010
Issue 1, March 2010
ACM Transactions on Storage (TOS) : Volume 5
ACM Transactions on Storage (TOS) : Volume 4
ACM Transactions on Storage (TOS) : Volume 3
ACM Transactions on Storage (TOS) : Volume 2
ACM Transactions on Storage (TOS) : Volume 1

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Online availability upgrades for parity-based RAIDs through supplementary parity augmentations

Content Provider ACM Digital Library
Author Cao, Qiang Xin, Qin Tian, Lei Jiang, Hong Feng, Dan Xie, Changsheng
Copyright Year 2011
Abstract In this article, we propose a simple but powerful online availability upgrade mechanism, $\textit{S}upplementary$ $\textit{P}arity$ $\textit{A}ugmentations(\textit{SPA}),$ to address the availability issue in parity-based RAID systems. The basic idea of SPA is to store and update the supplementary parity units on one or a few newly augmented spare disks for online RAID systems in the operational mode, thus achieving the goals of improving the reconstruction performance while tolerating multiple disk failures and latent sector errors simultaneously. By applying the exclusive OR operations appropriately among supplementary parity, full parity, and data units, SPA can reconstruct the data on the failed disks with a fraction of the original overhead that is proportional to the supplementary parity coverage, thus significantly reducing the overhead of data regeneration and decreasing recovery time in parity-based RAID systems. Our extensive trace-driven simulation study shows that SPA can significantly improve the reconstruction performance of the RAID5 and RAID5+0 systems, at an acceptable performance overhead imposed in the operational mode. Moreover, our reliability analytical modeling and sequential Monte-Carlo simulation demonstrate that SPA is consistently more than double the MTTDL of the RAID5 system and improves the reliability of the RAID5+0 system noticeably.
Starting Page 1
Ending Page 23
Page Count 23
File Format PDF
ISSN 15533077
e-ISSN 15533093
DOI 10.1145/1970338.1970341
Volume Number 6
Issue Number 4
Journal ACM Transactions on Storage (TOS)
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2011-06-02
Publisher Place New York
Access Restriction One Nation One Subscription (ONOS)
Subject Keyword Availability upgrade RAID RAID reconstruction
Content Type Text
Resource Type Article
Subject Hardware and Architecture
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