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Method and apparatus providing interoperation of execution images of different versions

  • US 7,383,541 B1
  • Filed: 08/07/2003
  • Issued: 06/03/2008
  • Est. Priority Date: 08/07/2003
  • Status: Active Grant
First Claim
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1. A method of providing interoperation of a first execution image of a first version and a second execution image of a second version, the method comprising the computer-implemented steps of:

  • receiving a compatibility matrix specifying whether the versions are compatible, base-level compatible, or incompatible;

    determining the versions of the first execution image and second execution image;

    identifying an entry in the compatibility matrix corresponding to the versions; and

    operating the execution images in a stateful switchover mode when the identified entry of the compatibility matrix specifies that the versions are either compatible or base-level compatible;

    wherein operating the execution images in a stateful switchover mode comprises operating the first execution image with a first processor of a dual-processor system and concurrently operating the second execution image with a second processor of the system.

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