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Live migration of a tree of replicas in a storage system

  • US 10,095,428 B1
  • Filed: 03/30/2016
  • Issued: 10/09/2018
  • Est. Priority Date: 03/30/2016
  • Status: Active Grant
First Claim
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1. A method for migrating a replica hierarchy from at least one source device to at least one target device in a storage system, the method comprising:

  • migrating a configuration of the replica hierarchy;

    migrating one or more internal nodes of the replica hierarchy;

    migrating one or more leaf nodes of the replica hierarchy; and

    performing a cutover operation by deactivating the at least one source device associated with the replica hierarchy,wherein migrating the configuration of the replica hierarchy comprises;

    preventing a change to a structure of the replica hierarchy;

    assigning an identifier to the at least one target device; and

    copying the configuration from the at least one source device to the at least one target device in an addressing mode based on the assigned identifier and identification information of the replica hierarchy, andwherein the identification information of the replica hierarchy comprises a triplet comprising a snapgroup pair identifier, the assigned identifier of the target volume, and an offset associated with a data location of the replica hierarchy.

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