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Method and means for encoding and rebuilding data contents of up to two unavailable DASDs in an array of DASDs

  • US 5,271,012 A
  • Filed: 02/11/1991
  • Issued: 12/14/1993
  • Est. Priority Date: 02/11/1991
  • Status: Expired due to Fees
First Claim
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1. A method for encoding and rebuilding of the data contents of up to two unavailable DASD'"'"'s form an array of a M failure independent DASDs, comprising the steps of:

  • (a) simple parity encoding over a (M-1)*M bit data array following a cylindrical, zig/zag traverse, said encoding being defined over pairs each formed from an array diagonal and a row intersecting the parity assigned to the diagonal;

    (b) striping and writing the parity coded data array to the M DASD array; and

    (c) responsive to up to two DASD failures, rebuilding the data on a patterned or random basis by accessing the data array and repeating steps (a) and (b) modified.

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