Computer system, connection device, power supply control method, and power supply control program recording medium

摘要

A host monitoring unit in a host connection device (301) detects a change in a connection status between a host device (101) and the host connection device (301) based on a change in power status of the host device (101), and notifies a host connection controller. The host connection controller notifies an I/O connection controller in an I/O connection device (401) connected with an I/O device (201) having a power linking permitted of the change in the connection status, and sets or cancels an interconnection. After the completion of the setting or cancellation of the interconnection, the I/O connection controller notifies an I/O power supply controller of the change in the connection status, and the I/O power supply controller controls an I/O power supply (20).

主权项

1. A connection device for connecting either one of target devices to a network via a system bus, the target devices being defined as a host device including a CPU device and an individual power supply, and an I/O device including a peripheral device and an individual power supply via a system bus, and which connects the host device or the I/O device to a network, the connection device comprises:
a central processing unit; a memory that stores a control program and is used for processing by the central processing unit; an inputter/outputter that inputs/outputs information and is connected with the target devices including power supplies via the system bus; a transmitter/receiver that transmits/receives information to/from another connection device and is connected to the network via the system bus; an internal bus that connects the central processing unit to the memory, the inputter/outputter, and the transmitter/receiver; a connection status monitoring portion, a connection status notifying portion, an interconnection control portion, and a transfer process portion that are functional portions whose function is attained by the central processing unit reading the control program from the memory, and executing the control program by using the memory, the inputter/outputter, and the transmitter/receiver; wherein the connection status monitoring portion is configured to detect a change in a connection status of the system bus connected with the either one of target devices the connection status notifying portion is configured to notify at least another connection device connected with the network and set in advance of the change in the connection status of the system bus detected by the connection status monitoring portion; the interconnection control portion is configured to set or cancel an interconnection with the at least another connection device set in advance based on the change in the connection status of the system bus detected by the connection status monitoring portion; the transfer process portion is configured to enable a virtual system bus transfer of data in the system bus connected with either one of the target devices over the network, the virtual system bus being between the transfer process portion and the at least another connection device to which the interconnection is set by the interconnection control portion; and the power supply control portion is configured to change ON/OFF states of the power supply of the connected either one of target devices when receiving the notification from the at least another connection device of the change in the connection status of the system bus.