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Row-diagonal parity technique for enabling efficient recovery from double failures in a storage array

  • US 7,409,625 B2
  • Filed: 02/23/2007
  • Issued: 08/05/2008
  • Est. Priority Date: 12/28/2001
  • Status: Expired due to Term
First Claim
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1. A method for enabling recovery from concurrent failure of a plurality of storage devices in a storage array, comprising:

  • storing data on a first plurality of storage devices of the storage array;

    storing row parity on one or more storage devices of the storage array;

    computing a diagonal parity set across the plurality of storage devices; and

    storing the diagonal parity set on an additional diagonal parity device, the diagonal parity device separate from the first plurality of storage devices.

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