Storage device and write completion notification method

A storage device comprising:

• a first control device including
• a memory controller that controls data write,
• a first determination unit that determines a state of a queue managed by the memory controller, and
• a first notification unit that outputs a state notification indicating that the queue is in a certain state, in a case where the first determination unit determines that the queue inside the memory controller is in the certain state;
• and
• a second control device including
• a second determination unit that determines whether or not the state notification output from the first control device has already been received, in a case where a write command that writes data to a storage medium managed by the first control device is received from a high-level device,
• an evacuation unit that evacuates data on the write command to another control device, in a case where the second determination unit determines that the state notification output from the first control device has already been received, and
• a second notification unit that outputs to the high-level device a completion notification indicating that writing the data is complete, after the evacuation unit finishes evacuating the data on the write command.