Patent ID: 8347060
Filing Date: 2013-01-01
Classification: G06F

Abstract:
1. A storage system comprising: a storage apparatus for providing a dynamic logical volume associated with a physical storage device to a host computer, wherein said host computer having a file system for inputting and outputting data to and from said dynamic logical volume, wherein said storage apparatus comprises: an allocation unit for allocating a plurality of storage extents in a prescribed unit to said dynamic logical volume associated with said physical storage device when said allocation unit receives said data sent from said host computer and said plurality of storage extents are not allocated in said prescribed unit, wherein said allocation unit determines whether said plurality of storage extents are allocated when said allocation unit receives said data sent from said host computer, and when said plurality of storage extents are allocated in said prescribed unit, said data is stored in said plurality of storage extents, a management unit for managing at least one first storage extent recognized as being currently used by said file system, from among said plurality of storage extents allocated to said dynamic logical volume by said allocation unit; and a release unit for releasing at least one second storage extent that is not being managed by said management unit, and that does not store said data, wherein said host computer comprises a notification unit for notifying at least one of said plurality of storage extents being currently used by said file system to said storage apparatus, wherein said management unit manages said at least one of said plurality of storage extents notified by said notification unit as said at least one first storage extent.