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Controller-based bi-directional remote copy system with storage site failover capability

  • US 6,643,795 B1
  • Filed: 03/30/2000
  • Issued: 11/04/2003
  • Est. Priority Date: 03/30/2000
  • Status: Expired due to Term
First Claim
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1. In a bi-directional data replication system having two sites each including a host computer and a node comprising a pair of array controllers coupled to a data storage array, a method for determining the node at which data is potentially available, said method comprising:

  • establishing a home node and an alternate node for each said host computer in the bi-directional data replication system;

    wherein each said host computer performs;

    during normal operation, accessing the home node for data;

    in the event of a failure in the home node where data cannot be accessed, accessing the alternate node for data; and

    when the home node again becomes operational, accessing the home node for data.

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