Storage controller and storage control method
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United States of America Patent
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May 15, 2012
Grant Date -
Jun 9, 2011
app pub date -
Feb 11, 2011
filing date -
Dec 13, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A storage controller having a plurality of storage devices and a control circuit providing a plurality of virtual volumes, to each of which a storage area in a plurality of pool volumes provided with the plurality of storage devices can be mapped for writing data in response to a write access sent from an information processing apparatus to a logical area in one of the plurality of virtual volumes, respectively. The control circuit, according to a search of the plurality of pool volumes for a certain storage area in which a certain data pattern is written, releases the certain storage area from mapping to a logical area in the plurality of virtual volumes, so that the control circuit can use the released certain storage area for mapping to a virtual volume of the plurality of virtual volumes as a destination of another write access from the information processing apparatus.
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