Patent ID: 8069331
Filing Date: 2011-11-29
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 having a file system for inputting and outputting data to and from said dynamic logical volume, and a management server for managing said storage apparatus and said host computer, wherein said storage apparatus comprises: an allocation unit for allocating plural storage extents in prescribed units to said physical storage device corresponding to said dynamic logical volume if said allocation unit receives said data sent from said host computer and said plural extents in prescribed units are not allocated, wherein if said allocation unit receives said data sent from said host computer, said allocation unit determines whether said plural extents are allocated or not and if said plural extents are allocated, data is stored in said plural extents; a management unit for managing at least one first storage extent recognized as being currently used by said file system, from among said plural 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 data from said dynamic logical volume, wherein said host computer comprises a data read unit for reading all metadata and file data, which said file system inputs and outputs, from said dynamic logical volume.