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Method and system for storing duplicate data

  • US 20010049749A1
  • Filed: 05/24/2001
  • Published: 12/06/2001
  • Est. Priority Date: 05/25/2000
  • Status: Active Grant
First Claim
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1. A data duplicating method that connects a first information processing system comprised of a first host computer and a first storage device and at least one second information processing system comprised of a second host computer and a second storage device through a data transfer path and holds the same data in duplicate in said first and second information processing systems by copying first update data generated in said first information processing system to said second information processing system, wherein said second information processing system possesses difference control information for identifying second update data generated in said second information processing system that takes over and executes a process of said first information processing system when said first information processing system stops operating, and after resumption of operation said first information processing system, said second update data is selectively copied to said first information processing system on the basis of said difference control information.

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