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Group Stamping Style Asynchronous Replication Utilizing A Loosely-Accurate Global Clock

  • US 20080243952A1
  • Filed: 03/28/2007
  • Published: 10/02/2008
  • Est. Priority Date: 03/28/2007
  • Status: Active Grant
First Claim
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1. A method for providing a group stamping style asynchronous replication service in a data backup and recovery storage environment, the method comprising:

  • intercepting storage requests at a set of source replication nodes configured to maintain a consistency group that spans multiple geographical sites;

    establishing an interval at the source replication nodes whereby all intercepted storage requests within the interval are recorded to a current group of storage requests;

    maintaining a loosely-accurate global clock among the source replication nodes, the loosely-accurate global clock based on a timestamp and a maximum error associated with the timestamp;

    agreeing, among the source replication nodes, on specific times at which to switch from the current group of storage requests to a next group of storage requests; and

    transmitting the current group of storage requests from the source replication nodes to one or more target replication nodes configured to service the consistency group to provide consistent replication of a target storage space of the consistency group.

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