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Coding techniques for handling failures in large disk arrays

Published: 01 September 1994 Publication History

Abstract

A crucial issue in the design of very large disk arrays is the protection of data against catastrophic disk failures. Although today single disks are highly reliable, when a disk array consists of 100 or 1000 disks, the probability that at least one disk will fail within a day or a week is high. In this paper we address the problem of designing erasure-correcting binary linear codes that protect against the loss of data caused by disk failures in large disk arrays. We describe how such codes can be used to encode data in disk arrays, and give a simple method for data reconstruction. We discuss important reliability and performance constraints of these codes, and show how these constraints relate to properties of the parity check matrices of the codes. In so doing, we transform code design problems into combinatorial problems. Using this combinatorial framework, we present codes and prove they are optimal with respect to various reliability and performance constraints.

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    Published In

    cover image Algorithmica
    Algorithmica  Volume 12, Issue 2-3
    September 1994
    176 pages

    Publisher

    Springer-Verlag

    Berlin, Heidelberg

    Publication History

    Published: 01 September 1994

    Author Tags

    1. Availability
    2. Error-correcting codes
    3. Input/output architecture
    4. RAID
    5. Redundant disk arrays
    6. Reliability

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