Patent ID: 9367256
Filing Date: 2016-06-14
CPC Classification: G06F

Claim Text:
1. A storage system comprising: a hardware processor; a data storage controlling part implemented on the hardware processor, the data storage controlling part being configured to store storage target data into a storage device and, when storing other storage target data of an identical data content to the storage target data already stored in the storage device into the storage device, refer to the storage target data already stored in the storage device as the other storage target data; and a defragmentation processing part implemented on the hardware processor, the defragmentation processing part being configured to move and store the storage target data stored in an area set as a defragmentation range within a predetermined region of the storage device, into another region of the storage device, wherein: the data storage controlling part is configured to, for each of the storage target data stored in the storage device, store reference frequency that is frequency of referring to the storage target data as the other storage target data; and the defragmentation processing part is configured to store the storage target data whose reference frequency is less than a preset threshold into an area to later become a defragmentation range within another region of the storage device, and store the storage target data whose reference frequency is equal to or more than the preset threshold into an area to later become a non-defragmentation range within another region of the storage device.