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Flexible hierarchy of relationships and operations in data volumes

  • US 7,103,737 B1
  • Filed: 07/01/2003
  • Issued: 09/05/2006
  • Est. Priority Date: 07/01/2003
  • Status: Active Grant
First Claim
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1. A method in a data processing system, comprising:

  • creating data volumes V1,1

    V1,n wherein data volume V1,1 is created as a point-in-time (PIT) copy of a volume V, wherein each data volume V1,x of data volumes V1,2

    V1,n is created as a PIT copy of data volume V1,x−

    1
    , and wherein each of data volumes V1,1

    V1,n and V2,1

    V2,m are initially created as virtual PIT copies;

    creating data volumes V2,1

    V2,m wherein data volume V2,1 is created as a PIT copy of the volume V, and wherein each data volume V2,y of data volumes V2,2

    V2,m is created as a PIT copy of data volume V2,y−

    1
    generating a refresh instruction for refreshing the data contents of data volume V2,y to the data contents of one of the data volumes V1,1

    V1,n;

    converting data volume V2,y from a virtual data volume into a real data volume after generation of the refresh instruction;

    modifying first data of data volume V2,y before the conversion of data volume V2,y.

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