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Failure resistant multiple computer system and method

  • US 20070174734A1
  • Filed: 10/18/2006
  • Published: 07/26/2007
  • Est. Priority Date: 10/25/2005
  • Status: Active Grant
First Claim
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1. A failure resistant method of operating a plurality of computers each with their corresponding independent local memory, each substantially simultaneously operating a corresponding portion of an application program written to execute on only a single computer, and each being connected via a communications network to permit updating of corresponding memory locations, said method comprising the steps of:

  • (i) categorizing the memory locations of said local memories into a first reachability category in which the local memory locations are replicated in selected ones, or all, of said computers and therefore require updating via said communications network with changes to corresponding memory locations of the other computers to maintain substantial memory coherence, and into a second category in which the local memory locations are present only in the local computer and therefore no updating is required, (ii) detecting failure of any one of said multiple computers, and (iii) modifying said first category to remove therefrom, if present, any reference to the failed computer, whereby no attempt is made to update any first category locations of said failed computer.

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