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Method for synchronizing reserved areas in a redundant storage array

  • US 5,590,276 A
  • Filed: 03/15/1995
  • Issued: 12/31/1996
  • Est. Priority Date: 01/08/1992
  • Status: Expired due to Term
First Claim
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1. A method for synchronizing the reserved areas of data storage units included within an array of failure independent data storage units, the data storage units being logically divided into at least two logical groups, each reserved area having blocks of data, each block of data being associated with a unique block of data within each other reserved area, including the steps of:

  • a. setting a current busy flag to indicate that data storage units within a current logical group of data storage units are being updated;

    b. updating, a block of data within a reserved area within the current logical group, and each associated block of data within each other reserved area in the current logical group;

    c. upon completely updating the block of data and each associated data block stored in each reserved area in the current logical group of data storage units, setting a next busy flag to indicate that the reserved areas of the data storage units within a next logical group of data storage units are being updated;

    d. updating each data block stored in the reserved areas in the next logical group of data storage units;

    e. repeating steps (d) and (e) for each logical group;

    f. resetting each busy flag to indicate that the updating process has been successfully completed.

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