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Managing a deletion of a volume referenced by a snapshot of a consistency group

  • US 10,241,869 B2
  • Filed: 03/08/2017
  • Issued: 03/26/2019
  • Est. Priority Date: 03/08/2017
  • Status: Active Grant
First Claim
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1. A method of managing a deletion of volume referenced by a snapshot of a consistency group, the method comprising:

  • designating a to-be deleted original volume as a ghost volume within a consistency group stored within a storage system, the consistency group, subsequent to the designation of the ghost volume, comprising the ghost volume and a plurality of original volumes;

    identifying a preexisting point-in-time snapshot of the consistency group that existed prior to the designation of the ghost volume, the preexisting point-in-time snapshot, subsequent to the designation of the ghost volume, comprising a plurality of pointers that each point to a different one of the plurality of original volumes of the consistency group and an orphaned pointer that points to the ghost volume;

    subsequent to the designation of the ghost volume, taking a present point-in-time snapshot of the consistency group, the present point-in-time snapshot consisting of a plurality of pointers that each point to a different one of the plurality of original volumes of the consistency group; and

    preventing deletion of the ghost volume from the storage system until there are no point-in-time snapshots of the consistency group that comprise a orphaned pointer that points to the ghost volume.

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