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Method for Remote Asynchronous Replication of Volumes and Apparatus Therefor

  • US 20100205392A1
  • Filed: 01/22/2010
  • Published: 08/12/2010
  • Est. Priority Date: 01/23/2009
  • Status: Active Grant
First Claim
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1. A method for asynchronous replication of volumes, comprising:

  • mirroring a source volume located on a first site to a destination volume located on a second site;

    receiving a Host input/output (IO) request, wherein the Host IO request is sent from a host located on the first site for writing an updated data set into a first data block of the source volume;

    executing a backup-on-write operation, wherein the backup-on-write operation firstly determines whether an original data set of the first data block of the source volume is the same with a data set of a second data block, corresponding to the first data block, of the destination volume, so as to determine whether the original data set of the first data block of the source volume is backuped to a first backup image located on the first site or not;

    writing the updated data set into the first data block of the source volume; and

    responding the host that the Host IO request has been completed.

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