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Data reconstruction method and system wherein timing of data reconstruction is controlled in accordance with conditions when a failure occurs

  • US 5,941,993 A
  • Filed: 07/17/1997
  • Issued: 08/24/1999
  • Est. Priority Date: 04/01/1991
  • Status: Expired due to Term
First Claim
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1. A data reconstruction system comprising:

  • a plurality of storage units having stored therein divided data and error correcting data for the divided data, the divided data being data divided into one of bit units, byte units, and arbitrary units stored in separate ones of the storage units;

    data reconstructing means for reconstructing divided data stored in any of the storage units in which a failure has occurred based on (1) divided data stored in other ones of the storage units in which a failure has not occurred and (2) the error correcting data, and storing the reconstructed divided data in at least one of the storage units;

    monitoring means for monitoring operation of the storage units and producing an output when a failure has occurred in any of the storage units;

    means, responsive to the output of the monitoring means, for determining a total number of the storage units in which a failure has occurred;

    means for storing a predetermined value based on a total number of the storage units in which the error correcting data is stored; and

    control means for controlling the data reconstructing means toreconstruct the divided data without stopping if the total number of the storage units in which a failure has occurred is not less than the predetermined value, andtemporarily stop reconstructing the divided data to allow the storage units to be accessed if the total number of the storage units in which a failure has occurred is less than the predetermined value.

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