Abstract: An information processing system includes a first information processing device, second information processing devices, and a relay device. The second information processing devices each include a second connector connected to the relay device, and a first restarter that restarts the second information processing devices. The relay device communicably connects the first and second information processing devices and includes a power supply control unit for power supply to the first and second information processing devices during restart of the relay device, and a second restarter that restarts the relay device in response to detection of a communication failure. The first information processing device includes a hot pluggable, first connector connected to the relay device, a first detector that detects restart of the relay device, and an initializer that initializes settings relating to communications via the relay device in response to detection of the relay device by the first detector.

Abstract: A storage section stores a first communication program that controls communication by a first communication section, a second communication program that controls communication by a second communication section, a first processing program and a second processing program that causes an associated communication program to transmit data on which a determined process has been performed, and correspondence information including a first identifier indicative of a first corresponding communication program associated with the first processing program and a second identifier indicative of a second corresponding communication program associated with the second processing program.

Abstract: An information processing system includes a plurality of information and a relay device. The information processing devices each includes a processor. The relay device connects the information processing devices via an expansion bus and relays communication between the information processing devices. The relay device includes a power supply controller that controls supply of power to the information processing devices, and performs control to shut off supply of power to the relay device and the information processing devices after detecting shutdown of all the information processing devices.