Abstract: An information processing system includes a plurality of control apparatuses communicably coupled to each other. A first control apparatus of the plurality of control apparatuses includes a first memory configured to store first instructions and a first processor configured to operate using standby power before a power-on selection is made. The first processor executes the first instructions causing a process including collecting first identification information of each of the plurality of control apparatuses other than the first control apparatus. The process includes storing the first identification information in the first memory. The process includes determining a role of the first control apparatus based on a comparison result derived by comparing second identification information of the first control apparatus with the first identification information.

Abstract: An information processing system includes a plurality of control apparatuses communicably coupled to each other. A first control apparatus of the plurality of control apparatuses includes a first memory configured to store first instructions and a first processor configured to operate using standby power before a power-on selection is made. The first processor executes the first instructions causing a process including collecting first identification information of each of the plurality of control apparatuses other than the first control apparatus. The process includes storing the first identification information in the first memory. The process includes determining a role of the first control apparatus based on a comparison result derived by comparing second identification information of the first control apparatus with the first identification information.

Abstract: A relaying apparatus placed between a control apparatus and a storage device in a storage apparatus includes a first connection unit, a second connection unit and a processor. The first connection unit is connected to a storage device. A detecting unit detects a link-down of the first connection unit. The processor executes a process in which, the address of the storage device that was connected to the first connection unit when the link-down has occurred to the first connection unit matches the address of the storage device connected to the second connection unit when the link-up has occurred to the second connection unit, and an access request is given from the control apparatus with an attached first identifier that identifies the first connection unit, data is forwarded via the second connection unit.

Abstract: A relaying apparatus placed between a control apparatus and a storage device in a storage apparatus includes a first connection unit, a second connection unit and a processor. The first connection unit is connected to a storage device. A detecting unit detects a link-down of the first connection unit. The processor executes a process in which, the address of the storage device that was connected to the first connection unit when the link-down has occurred to the first connection unit matches the address of the storage device connected to the second connection unit when the link-up has occurred to the second connection unit, and an access request is given from the control apparatus with an attached first identifier that identifies the first connection unit, data is forwarded via the second connection unit.

Abstract: A control device includes: an output circuit configured to output a first signal to a first point on a first conductive wire wired on a substrate; a reception circuit configured to receive the first signal that is transmitted through the first conductive wire, from a second point on the first conductive wire, as a second signal; and a decision circuit configured to decide a compensation value of first attenuation of a third signal that is input to a second conductive wire that is wired on the substrate and different from the first conductive wire by referring to information on second attenuation of the first signal based on a waveform of the second signal.

Abstract: An information processing system includes information processing devices and relay devices to relay data between the information processing devices, the relay devices each including communication ports, a transmission/reception control unit to cause a first transmission/reception operation and a second transmission/reception operation to be selectively executed, the first transmission/reception operation being an operation in which data is transmitted and received at a first transmission speed, the second transmission/reception operation being an operation in which data is transmitted and received in parallel at a second transmission speed lower than the first transmission speed, and a data division unit to generate pieces of division transmission data whose number is equal to the number of the communication ports by dividing transmission data to cause the generated pieces of division transmission data to be transmitted through the respective communication ports, when the second transmission/reception operati

Abstract: An information processing system includes information processing devices and relay devices to relay data between the information processing devices, the relay devices each including communication ports, a transmission/reception control unit to cause a first transmission/reception operation and a second transmission/reception operation to be selectively executed, the first transmission/reception operation being an operation in which data is transmitted and received at a first transmission speed, the second transmission/reception operation being an operation in which data is transmitted and received in parallel at a second transmission speed lower than the first transmission speed, and a data division unit to generate pieces of division transmission data whose number is equal to the number of the communication ports by dividing transmission data to cause the generated pieces of division transmission data to be transmitted through the respective communication ports, when the second transmission/reception operati

Abstract: A communication control apparatus in a RAID device including redundant communication paths to storage devices includes a blocking unit. The blocking unit blocks configuration change notifications outputted from the storage devices to a control apparatus, which controls access to the storage devices, when a power of a communication relay device arranged on the redundant paths connecting the storage devices and the control apparatus is turned off.

Abstract: A communication control apparatus in a RAID device including redundant communication paths to storage devices includes a blocking unit. The blocking unit blocks configuration change notifications outputted from the storage devices to a control apparatus, which controls access to the storage devices, when a power of a communication relay device arranged on the redundant paths connecting the storage devices and the control apparatus is turned off.