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Apparatus and method for mirroring and restoring data

  • US 7,149,787 B1
  • Filed: 06/07/2001
  • Issued: 12/12/2006
  • Est. Priority Date: 06/07/2001
  • Status: Expired due to Term
First Claim
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1. A method for mirroring data of a first storage area, comprising:

  • placing a second storage area in a first state, wherein the first state of the second storage area is a state in which updates to the first storage area are made to the second storage area;

    mirroring data from the first storage area to the second storage area while the second storage area is in the first state;

    changing a state of the second storage area from the first state to a second state in which updates to the first storage area are not made to the second storage area, wherein after the changing act the second storage area contains a snapshot of data of the first storage area at a given time;

    restoring data to the first storage area from the second storage area while maintaining the second storage area in the second state;

    updating, after the restoring act is complete, data within the first storage area such that the updated data within the first storage area is different from the snapshot of data; and

    restoring, from the second storage area, the snapshot data to replace the updated data within the first storage area.

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