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Time and space efficient technique for creating virtual volume copies

  • US 7,886,119 B1
  • Filed: 02/27/2007
  • Issued: 02/08/2011
  • Est. Priority Date: 09/06/2002
  • Status: Active Grant
First Claim
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1. A non-transitory computer-readable storage medium encoded with an executable program for generating skip-pointers in a chain of snapshots descending from a parent, wherein the program causes a processor to perform the following:

  • receiving a write request to a data block in the parent;

    determining if the write request is a first write request to the data block in the parent;

    when the write request is the first write request to the data block in the parent;

    copying the data block from the parent to a most recent snapshot in the chain of snapshots;

    writing a skip-pointer in at least one of the other snapshots in the chain of snapshots, the skip-pointer leading to the data block in the most recent snapshot;

    writing the data block in the parent;

    when the write request is not the first write request to the data block, only writing the data block in the parent.

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