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Managing snapshot history in a data storage system

  • US 20070067583A1
  • Filed: 09/19/2005
  • Published: 03/22/2007
  • Est. Priority Date: 09/19/2005
  • Status: Active Grant
First Claim
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1. A method for creating logical volume snapshots in a data storage system, comprising:

  • responsively to a first write command to write first data to a partition of a logical volume, generating a first partition descriptor record (PDR) and storing the first data at a first physical location associated with the first PDR;

    subsequent to the first write command, receiving a snapshot command to form a snapshot of the logical volume;

    subsequent to the snapshot command and responsively to a second write command to write second data to the partition of the logical volume, generating a second PDR and storing the second data at a second physical location associated with the second PDR, and generating a pointer between the first PDR and the second PDR; and

    subsequent to the second write command and responsively to a read command indicating a number of a desired snapshot of the logical volume, accessing the first PDR using the pointer.

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