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Synchronization and resynchronization of loosely-coupled copy operations between a primary and a remote secondary DASD volume under concurrent updating

  • US 6,842,834 B2
  • Filed: 03/20/2003
  • Issued: 01/11/2005
  • Est. Priority Date: 06/24/1997
  • Status: Expired due to Term
First Claim
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1. A method for copying data from a first storage system to a second storage system, comprising:

  • copying data from storage locations in the first storage system to the second storage system;

    detecting update data to one storage location in the first storage system while copying data from storage locations in the first storage system to the second storage system;

    storing the update data to the first storage system;

    transmitting the detected update data to the second storage system; and

    applying the update data to the second storage system in a manner that maintains consistency between data copied from the storage locations and update data, wherein the update data is transmitted to the second storage system before all the data as been copied from the storage locations in the first storage system to the second storage system, and wherein the update data is capable of being applied to the second storage system while copying data from the storage locations in the first storage system to the second storage system.

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