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Method and apparatus for storing and retrieving multiple point-in-time consistent data sets

  • US 20060041823A1
  • Filed: 08/03/2004
  • Published: 02/23/2006
  • Est. Priority Date: 08/03/2004
  • Status: Active Grant
First Claim
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1. A method of processing multiple point-in-time consistent data sets comprising:

  • creating a first data set;

    creating a second data set wherein the first data set and the second data set are associated with a backup appliance which is associated with backup storage;

    transferring a first update from a primary storage controller to the backup appliance;

    determining that the first update affects first data stored in the backup storage that has been unchanged following the creation of the first data set and the second data set;

    reading the first data from the backup storage;

    writing a copy of the first data to the first data set;

    saving a pointer associated with the second data set and directed to the copy of the first data; and

    applying the update to the first data on the backup storage.

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