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Fault-tolerant networkable computer software with access locking

  • US 5,748,870 A
  • Filed: 04/07/1993
  • Issued: 05/05/1998
  • Est. Priority Date: 11/07/1990
  • Status: Expired due to Fees
First Claim
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1. On-line, data-replication software operative on a computer network having multiple, intelligent processor-equipped workstations, said software being loadable to RAM at said workstations and replicating data-changing activity originating from said workstation to both a primary storage device supported by a primary file server and to a secondary storage device, said primary file server providing multi-user access to said primary storage device and supporting data-access locking with data-access lock and unlock capabilities for regulating multi-user access to data on the primary logical drive said data-replication software having an access-lock-sequencing protocol comprising:

  • a) an access lock sequencer operative to apply access locks sequentially, firstly to data on said primary storage device and subsequently to replicated data, on said secondary storage device; and

    b) an access-unlock sequencer operative to remove access locks sequentially, firstly, from access-locked data on said secondary storage device and subsequently from access-locked data on said primary storage device.

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