Computer system, control method for computer system and coupling module

A control method for a computer system, the computer system comprising a server module, a storage module, and a coupling module,

• the server module comprising a first processor, a first memory, and a first interface for coupling to other devices,
• the storage module comprising a second processor, a second memory, a storage device, and a second interface for coupling to other devices,
• the coupling module comprising a first end point, which is connected to the first interface, and a second end point, which is connected to the second interface,
• the control method comprising:
• a first step of detecting, by the server module, a failure in the first interface;
• a second step of executing, by the server module, given recovery processing when a failure is detected in the first interface;
• a third step of using, by the coupling module, the first end point to detect a failure in the first interface and output a failure notification;
• a fourth step of converting, by the coupling module, the failure notification into a notification of disconnection of the first interface, and transmitting the disconnection notification generated by the conversion to the storage module from the second end point;
• and
• a fifth step of disengaging, by the storage module, coupling to the server module when the disconnection notification is received from the coupling module.

A coupling module for coupling a first device and a second device, comprising:

• a first end point which is connected to a first interface of the first device and, when detecting a failure in the first interface, outputs a failure notification;
• a second end point which is connected to a second interface of the second device;
• a data transfer part for transferring data between the first end point and the second end point;
• and
• an event imitation part for converting the failure notification into a notification of disconnection of the first interface when the first end point outputs the failure notification, and transmitting the disconnection notification generated by the conversion to the second device from the second end point.