Storage device, and read command executing method

A storage device comprising:

• a plurality of ports connectable to an initiator;
• nonvolatile memory;
• a memory control section;
• a table holding section configured to manage a table in which an identifier, with which a read command is identifiable, a logical address of readout data corresponding to the identifier, and number of data transfers indicating readout data length corresponding to the identifier are registered as an entry based on the read command from the initiator;
• a read issuing section configured to issue the logical address and the readout data length for each identifier to the memory control section;
• a read buffer configured to hold data read out by the memory control section from the non-volatile memory based on a physical address corresponding to the logical address and the readout data length for each identifier along with the identifier;
• and
• a transfer management section configured to manage number of data scheduled to be transferred and number of data transferred up to now for each port, output a priority port, which is a port with a least number of remaining transfers obtained by subtracting the number of data transferred up to now from the number of data scheduled to be transferred, add the number of data transfers of the entry to the number of data scheduled to be transferred of the priority port when the entry is registered in the table holding section, and add a number corresponding to the readout data to the number of data transferred up to now of the priority port when the readout data is transmitted to the initiator through the priority port.

A read command executing method of a storage device including non-volatile memory and a memory control section;

• the method comprising:
• holding an identifier, with which a read command is identifiable, a logical address of readout data corresponding to the identifier, and readout data length corresponding to the identifier in a table based on the read command;
• reading out data to a read buffer from a physical address of the non-volatile memory corresponding to the logical address for each identifier;
• and
• transferring data corresponding to the identifier received by the read buffer to outside when the data of the logical address is received for the same identifier in the read buffer and the identifier is held as incomplete readout in the table.