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Methods to reduce RAID hot spare rebuild duration

IP.com Disclosure Number: IPCOM000229516D
Publication Date: 2013-Aug-02
Document File: 3 page(s) / 201K

Publishing Venue

The IP.com Prior Art Database

Related People

Jim Casaburi: INVENTOR [+2]

Abstract

Instead of having an extra drive (hot spare) ready to recreate the full data set of a failed drive have an drive setup as a periodically synched parity of the entire RAID set. Thus when a drive dies, instead of rebuilding the entire data set, only the blocks written since the last sync need to be transferred in order to restore the fault tolerance of the original array.

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Methods to reduce RAID hot spare rebuild duration

 Jim Casaburi Brent Kusuhara

Symantec Corporation

Abstract

Instead of having an extra drive (hot spare) ready to recreate the full data set of a failed drive have an drive setup as a periodically synched parity of the entire RAID set. Thus when a drive dies, instead of rebuilding the entire data set, only the blocks written since the last sync need to be transferred in order to restore the fault tolerance of the original array. Copyright © 2013 Symantec Corporation. All rights reserved.

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Methods to reduce RAID hot spare rebuild duration

Problem Statement

     RAID (Redundant Arrays of Inexpensive/Independent Disks) provides the ability to survive one or more drives failing via redundant parity information (depending on the specific RAID algorithm in use). However, once a drive does fail, there is a high probability of another drive failing relatively soon thereafter, and thus it is imperative to restore the fault tolerance of the original array as soon as conceivably possible. So-called hot-spare drives are often added to an array, and are ready to take over for any drive that fails, though for la...