Data storage apparatus, non-transitory computer-readable recording medium having stored therein data storage apparatus control program, and method for controlling data storage device

A data storage apparatus comprising:

• a plurality of media that store data stored in a first storage device;
• a memory;
• and
• a processor coupled to the memory and the processor configured to:
• generate a duplicate of the data being stored in two or more of the plurality of media in a first arrangement, and store the duplicate into two or more other media of the plurality of media except for the two or more media, wherein
• the processor generates duplicates of a plurality of data blocks classified according to a plurality of pieces of dimension information, and stores the duplicates into the two or more other media in a second arrangement different from the first arrangement of the plurality of data blocks into the two or more media.

A non-transitory computer-readable recording medium having stored therein a data storage apparatus control program that causes a computer to execute a process comprising:

• calculating a ratio of each of a plurality of data blocks, which are classified according to a plurality of pieces of dimension information in the data stored in two or more of a plurality of media, to the data, the plurality of media being included in a second storage device and being to store data stored in a first storage device;
• determining, based on the calculated ratio, whether the data block is to be duplicated;
• and
• generating a duplicate of a data block determined to be duplicated and storing the generated duplicate into another medium of the plurality of media except for the two or more media.

A method for controlling a data storage apparatus, the method comprising:

• calculating a ratio of each of a plurality of data blocks, which are classified according to a plurality of pieces of dimension information in the data stored in two or more of a plurality of media, to the data, the plurality of media being included in a second storage device and being to store data stored in a first storage device;
• determining, based on the calculated ratio, whether the data block is to be duplicated;
• and
• generating a duplicate of a data block determined to be duplicated and storing the generated duplicate into another medium of the plurality of media except for the two or more media.