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Apparatus and method for mirroring and restoring data

  • US 7,444,420 B1
  • Filed: 04/21/2006
  • Issued: 10/28/2008
  • 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; and

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

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