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On demand consistency checkpoints for temporal volumes within consistency interval marker based replication

  • US 7,885,923 B1
  • Filed: 06/13/2007
  • Issued: 02/08/2011
  • Est. Priority Date: 06/30/2006
  • Status: Expired due to Fees
First Claim
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1. A method, comprising:

  • a plurality of nodes in a distributed computing environment sending write requests to a primary temporal volume and replicated write requests for the temporal volume to a replication target device, wherein the temporal volume is configured to store temporal data, wherein each replicated write request is a copy of a corresponding one of the write requests, wherein each of the replicated write requests is associated with an indication of a timestamp for the temporal data on the temporal volume, and wherein the replication target device is configured to generate a checkpoint of the temporal volume corresponding to the timestamp;

    initiating a consistency interval transition, wherein the consistency interval transition defines a point in time at which data on the temporal volume is in a consistent state, and wherein the consistency interval transition corresponds to the timestamp;

    in response to the initiation of the consistency interval transition, each of the plurality of nodes;

    temporarily suspending sending replicated write requests to the replication target device; and

    subsequent to said temporarily suspending, resuming sending replicated write requests to the replication target device, wherein an indication of a second timestamp is associated with each replicated write request sent after said resuming.

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