Storage system and storage control device
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United States of America Patent
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Mar 2, 2010
Grant Date -
Jan 17, 2008
app pub date -
Jul 3, 2007
filing date -
Oct 27, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A virtualization system, including: at least one first port coupled to at least one host system; at least one second port coupled to a plurality of storage systems; wherein the virtualization system is capable to control to perform processes of splitting a relationship between the first virtual volume and the second virtual volume; storing first differential information identifying data of a first write request; write data of first write request to a storage area of the disk drives related to the first logical volume; storing second differential information identifying data of a second write request, the data of the second request being written after the splitting step, receiving a differential copying request; to copy differential data from the first virtual volume to the second virtual volume, or to copy differential data from the second virtual volume to the first virtual volume.
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