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Rapid regeneration of failed disk sector in a distributed database system

  • US 7,281,160 B2
  • Filed: 02/10/2004
  • Issued: 10/09/2007
  • Est. Priority Date: 02/10/2003
  • Status: Active Grant
First Claim
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1. A method for operating a Redundant Array of Inexpensive Disks (RAID) to recover from read errors comprising:

  • in a disk controller,detecting that a read error has occurred in a sector associated with a particular Logical Block Address (LBAi) in a primary disk portion;

    reporting an unrecoverable read error at LBAi;

    remapping the sector originally associated with the LBAi for which the read error occurred to a replacement sector;

    in a RAID controller,receiving a report of an unrecoverable read error at LBAi;

    retrieving data from a mirror disk portion associated with the primary disk portion that contains LBAi; and

    writing the same data thereby retrieved to the LBAi on the primary disk portion for which the error was specified.

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