Storage apparatus and control method for storage apparatus

A control method for a storage apparatus including a first data controller and a second data controller, the control method comprising:

• storing, by the first data controller, externally input data to a memory of the first data controller;
• reading, by the first data controller, data stored in the memory of the first data controller and transmits the data to the second data controller through a PCIe bridge of the first data controller;
• detecting, by the first data controller, a failure at the PCIe bridge of the first data controller in transmission of the data;
• receiving, by the second data controller, the data transmitted from the first data controller through a PCIe bridge of the second data controller;
• writing, by the second data controller, the received data to a memory of the second data controller;
• determining, by the second data controller, whether the failure is caused by the first data controller or not if a failure occurs in the memory controller and PCIe bridge of the second data controller when the received data is written to the memory;
• transmitting, by the first data controller, the data causing the failure during transmission through the PCIe bridge of the first data controller if a failure is detected in the first data controller and the second data controller and the failure is caused by the first data controller;
• and
• receiving, by the second data controller, the data retransmitted from the PCIe bridge of the first data controller through the PCIe bridge of the second data controller if a failure is detected in the first data controller and the second data controller and the failure is caused by the first data controller.