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Method and system for shadowing file system structures from multiple types of networks

  • US 5,721,916 A
  • Filed: 02/26/1997
  • Issued: 02/24/1998
  • Est. Priority Date: 11/18/1994
  • Status: Expired due to Term
First Claim
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1. In a data processing system having a computer with a storage device and that is connectable without rebooting to a first network of a first type and a second network of a second type, wherein the first network and the second network each store file system structures, a method of providing access to one of the file system structures from one of the networks when the computer is disconnected from at least one of the networks, comprising the steps of:

  • when the computer is connected to the first network and a first program is running on the computer,(i) receiving a first request to access a selected one of the file system structures stored on the first network from the first program;

    (ii) in response to the first request, transparently obtaining a shadow copy of the selected file system structure relative to the first program;

    (iii) storing the shadow copy of the selected file system structure in a shadow database on the storage device which holds file system structures connected to the first network;

    when the computer is subsequently connected to the second network and a second program is running on the computer,(i) receiving a second request to access a given one of the file system structures stored on the second network from the second program;

    (ii) in response to the second request, transparently obtaining a shadow copy of the given file system structure relative to the second program; and

    (iii) storing the shadow copy of the given file system structure in the shadow database on the storage device.

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