Achieving data consistency with point-in-time copy operations in a parallel I/O environment
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United States of America Patent
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Apr 19, 2011
Grant Date -
Sep 11, 2008
app pub date -
May 21, 2008
filing date -
Jan 21, 2005
priority date (Note) -
Expired
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Abstract
A method for processing a point-in-time copy of data associated with a logical storage volume where the data to be copied is stored in a striped or parallelized fashion across more than one physical source volume. The method includes receiving a point-in-time copy command concerning a logical volume and distributing the point-in-time copy command in-band to each of the physical source volumes containing a portion of the striped data. The method also includes establishing a point-in-time copy relationship between each physical source volume and one of a corresponding set of multiple physical target volumes. The method further includes copying the data stored on each physical source volume to the corresponding physical target volume. The in-band copy command and the striped data may be distributed over I/O channels between a server and the physical storage and processed sequentially.
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