Patent ID: 8775765
Filing Date: 2014-07-08
Classification: G06F

Abstract:
1. A computer system comprising: a storage system, which is configured to define a virtual pool including a physical storage area of a storage media in the storage system and to provide a first virtual volume using the virtual pool so that the storage system is configured to allocate the physical storage area included in the virtual pool to the first virtual volume upon writing data to the first virtual volume; a first server computer, which is configured to read from and writes to the storage system by the block access protocol and is configured to: a second server computer, which is configured to: wherein the second virtual volume is created for the capacity reduction using the virtual pool, so that the storage system is configured to allocate the physical storage area included in the virtual pool to the second virtual volume upon writing data to the second virtual volume; wherein the first virtual volume is deleted so that allocated physical storage area of first virtual volume becomes unallocated physical storage area of the virtual pool; and wherein the virtual pool includes the physical storage area in one storage system and does not include physical storage area in another storage system.