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Method and apparatus for restarting a computing system

  • US 4,648,031 A
  • Filed: 06/21/1982
  • Issued: 03/03/1987
  • Est. Priority Date: 06/21/1982
  • Status: Expired due to Term
First Claim
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1. Apparatus for restarting a computing system following interruption, including a plurality of resource managers that manage resource collections such as data bases, non-volatile storage means containing a recovery log on which are recorded checkpointed states and images of changes resulting from the execution of work unit instructions, a subset of said resource managers having responsibilities in the execution of work unit instructions and the recovery of work units during restart, said apparatus comprising:

  • first data structure means for recording for an interrupted work unit the location of a respective section of the recovery log which contains information of its activities and the recovery responsibility of each resource manager to the work unit;

    second data structure means for recording for each resource manager its operational state and the location of a respective different section of the recovery log which contains information that particular resource manager needs to perform its recovery responsibility; and

    recovery means which receives and is responsive to information recorded in said first and second data structure means for restarting selected resource managers following interruption and deferring the restarting of other resource managers.

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