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Recovery of a logical unit in a consistency group while replicating other logical units in the consistency group

  • US 8,954,796 B1
  • Filed: 06/26/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 06/26/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • recovering at least one logical unit of a consistency group in a journal-based replication system without interruption of replication of other logical units in the consistency group, the at least one logical unit being one of a physical logical unit or a virtual logical unit;

    receiving a request to recover a logical unit in the consistency group at a point-in-time (PIT);

    ceasing replication of the logical unit to a backup logical unit;

    recovering the logical unit at the PIT while continuing replicating other logical units in the CG;

    marking a first recovery point at an end portion of an UNDO METADATA stream associated with the PIT;

    marking a second recovery point at an end portion of a DO METADATA stream associated with the PIT; and

    generating differences between the production logical unit and the backup logical unit by joining the metadata in a local delta marker stream and the data in the DO metadata stream associated with the production logical unit.

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