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Automatic site failover

  • US 7,542,987 B2
  • Filed: 04/21/2005
  • Issued: 06/02/2009
  • Est. Priority Date: 03/28/2002
  • Status: Expired due to Term
First Claim
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1. A storage controller, comprising:

  • an input port to receive input/output data operations from a host computer;

    an output port for transmitting input/output data operations to at least one destination controller;

    a processor;

    a memory module communicatively connected to the processor and comprising logic instructions which, when executed, configure the processor to;

    detect a failure in normal heartbeat operations between the storage controller and at least one destination controller; and

    in response to the failure;

    take the storage controller offline to the host computer when communication connections fail between the storage controller and a first predetermined number of destination controllers; and

    log write input/output operations directed to the one or more destination controllers into a data log when communication connections remain active between the storage controller and a second predetermined number of destination controllers.

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