Data transferring apparatus, data transmission system and data transmitting method

A data transmission system that reads and transmits file data stored in a storage apparatus that manages data in a block unit, the data transmission system comprising a CPU and a data transferring apparatus, wherein

• the CPU is configured to:
• generate a transmission instruction of first file data stored in the storage apparatus;
• and
• based on the transmission instruction, generate a reading instruction of metadata including first map information showing in which location on the storage apparatus the first file data is stored;
• the data transferring apparatus comprises circuitry configured to:
• based on the reading instruction of the metadata, generate a reading command of the metadata and send the reading command of the metadata to the storage apparatus;
• the CPU is configured to receive the metadata returned from the storage apparatus, acquire the first map information by analyzing the metadata, and generate a reading instruction of the first file data based on the first map information;
• and
• the circuitry of the data transferring apparatus is configured to:
• based on the reading instruction of the first file data, generate a reading command of a block storing the first file data and send the reading command to the storage apparatus;
• receive block data read from the storage apparatus according to the reading command and, based on the first map information, extract the first file data from the block data;
• and
• transmit the extracted first file data.

A data transmission method that reads and transmits file data stored in a storage apparatus that manages data in a block unit, comprising:

• generating a transmission instruction of first file data stored in the storage apparatus;
• generating based on the transmission instruction, a reading instruction of metadata including first map information showing in which location on the storage apparatus the first file data is stored;
• generating a reading command of the metadata based on the reading instruction of the metadata and transmitting the reading command to the storage apparatus;
• receiving metadata returned from the storage apparatus, the metadata including the first map information, and acquiring the first map information by analyzing the metadata, and generating a reading instruction of the first file data based on the first map information;
• generating a reading command of a block storing the first file data, based on the reading command of the first file data, and transmitting the reading command of the block to the storage apparatus;
• receiving block data read from the storage apparatus according to the reading command of the block and extracting the first file data from the block data based on the first map information;
• and
• transmitting the first file data.

A non-transitory computer readable medium having instructions stored therein which causes a computer to, in order to transfer file data stored in a storage apparatus that manages data in a block unit, execute steps comprising:

• receiving a reading instruction of first file data based on first map information showing in which location on the storage apparatus the first file data is stored, the first map information being acquired by an external host CPU that receives metadata including the first map information and acquires the first map information by analyzing the metadata, generating a reading command of a block storing the first file data according to the reading command of the first file data, and sending the reading command of the block to the storage apparatus;
• receiving block data read from the storage apparatus according to the reading command of the block, receiving the first map information acquired by the external host CPU and, based on the first map information, extracting the first file data from the block data;
• and
• transmitting the first file data as extracted.