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METHOD FOR AUTO-CORRECTION OF ERRORS IN A RAID MEMORY SYSTEM

  • US 20090055585A1
  • Filed: 08/24/2007
  • Published: 02/26/2009
  • Est. Priority Date: 08/24/2007
  • Status: Active Grant
First Claim
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1. A method for auto-correction of errors in an array of a plurality of disk storage devices having at least a pair of said plurality of storage devices dedicated to storing parity data to provide a fault tolerance for a loss of at least two of said plurality of disk storage devices, said array being arranged in a plurality of disk storage channels, the method comprising the steps of:

  • a. performing a read operation from said array, said read operation including respectively transferring data read from each said plurality of disk storage channels to a corresponding disk channel memory;

    b. reading said data from said disk channel memories and performing a parity check of said data read from said disk channel memories;

    c. responsive to a failure of said parity check in an unidentified disk storage channel, testing said data to identify one of said plurality of disk storage channels as being in error; and

    d. responsive to identifying said one disk storage channel as being in error, using remaining other of said plurality of disk storage channels to provide valid data to a processor requesting said data.

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