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Method and system to maintain data consistency over an internet small computer system interface (iSCSI) network

  • US 20060136685A1
  • Filed: 12/17/2004
  • Published: 06/22/2006
  • Est. Priority Date: 12/17/2004
  • Status: Abandoned Application
First Claim
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1. A method to transfer data writes from a primary site to a secondary site, for disaster recovery purposes, said method comprising:

  • inserting a PiT marker beginning a PiT frame to be transferred;

    logging data writes in a primary journal, wherein said data writes are ordered in the point-in-time (PiT) frame;

    inserting a PiT marker indicating end of said PiT frame to be transferred;

    iteratively obtaining data writes saved in said PiT frame;

    generating, for each data write to be transferred, a small computer system interface (SCSI) command;

    transferring said generated SCSI command to said secondary site using the iSCSI protocol; and

    saving a data write encapsulated in the SCSI command in a secondary journal.

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