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Maintaining write order fidelity on a multi-writer system

  • US 7,475,207 B2
  • Filed: 07/14/2006
  • Issued: 01/06/2009
  • Est. Priority Date: 07/14/2005
  • Status: Active Grant
First Claim
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1. A method of providing write order fidelity in a distributed set of data access nodes in a network, comprising the steps of:

  • storing a write request to a first cache for an open delta, the first cache corresponding to a first node receiving the write request;

    transmitting a message, in response to a triggering event, to each node in the set of data access nodes to close the open delta;

    for each node having a write request for the open delta, completing any pending write requests for the open delta and closing the open delta;

    exchanging write request information among nodes so that each node is associated with a complete copy of the write request information for the closed delta;

    writing each complete copy to persistent storage;

    storing each complete copy of the closed delta to back-end storage for each node; and

    grouping front-end volumes into write-order fidelity (WOF) groups, each WOF group including at least one site across the network.

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