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Computerized system and method for data backup

  • US 5,435,004 A
  • Filed: 07/21/1994
  • Issued: 07/18/1995
  • Est. Priority Date: 07/21/1994
  • Status: Expired due to Fees
First Claim
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1. A computerized method for dynamically preserving a consistent state of primary data in a logical volume of a disk volume management system during runtime, comprisinggenerating a file system command to clone said logical volume;

  • reserving a portion of said logical volume for shadow-paged blocks in response to said file system command;

    generating a read/write translation map;

    generating a read command of a first page of said logical volume;

    detecting, in response to said read command, from a search of said map, whether a shadow page is allocated in said shadow-paged blocks corresponding to said first page; and

    reading said shadow page in response to said detecting that said shadow page corresponding to said first page is allocated.

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