Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kyosuke Achiwa0
Kentaro Kakui0
Date of Patent
May 24, 2011
0Patent Application Number
127044630
Date Filed
February 11, 2010
0Patent Primary Examiner
Patent abstract
An object of the present invention is to improve the usage efficiency of a storage extent in a storage system using the Allocation on Use (AOU) technique. A controller in the storage system allocates a storage extent in an actual volume to an extent in a virtual volume accessed by a host computer, detects any decrease in necessity for maintaining that allocation, and cancels the allocation of the storage extent in the actual volume to the extent in the virtual volume based on the detection result.
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