Abstract: A storage system that functions as one or more logical volumes includes a control unit and a plurality of storage units connected to the control unit, wherein the control unit includes a memory that stores allocation status information that indicates status of allocation of the plurality of storage units to a logical volume; an access request responding unit that controls at least one storage unit among the plurality of storage units in response to a request for access to each logical volume from a host device; and a power saving controller that identifies an unused storage unit not allocated to any logical volume among the plurality of storage units on the basis of the allocation status information and performs power saving control on the identified unused storage unit.

Abstract: Batteries, a power source that charges the batteries, a sensor that obtains a quantity of charge of each battery and a total sum of the quantities of charge of the batteries, and a processor are provided in an information processing device. The processor determines a charging candidate battery and the number of charging candidate batteries on the basis of the quantity of charge of each battery and the total sum of the quantities of charge of the batteries, determines a set of a target battery and charging power so that the charging candidate battery is charged by using the charging power that is one of a value obtained by dividing maximum suppliable power by the number of charging candidate batteries, and maximum receivable power, whichever is smaller, and controls the target battery to be charged by the charging power by using the power source.

Abstract: An OOB sequence monitoring unit detects that an OOB sequence carried out between a base device as a superior device and a connection I/F which operates even if an extension device is in a standby state has proceeded to a given stage. Based on the detection by the OOB sequence monitoring unit, a power supply control unit instructs a starting power supply unit to supply power. When the extension device starts, the OOB sequence is carried out between the extension device and the connection I/F of another extension device in the same manner. As a result, extension devices are started in decreasing order from the extension device closest to the superior device.

Abstract: A control system includes: a superordinate apparatus that includes a multi-path driver controlling an access path; and a second control unit that transmits a control signal used for an instruction for setting an access path to a first control unit that is newly connected to be communicable with the superordinate apparatus to the superordinate apparatus. The multi-path driver sets the access path to the first control unit based on the control signal supplied from the second control unit, thereby autonomously setting the access path in a case where a control unit is additionally installed.

Abstract: A storage apparatus connectable to an external apparatus through a connection line for data communication includes: a storage for storing data; a system controller for controlling data communication with the external apparatus through the connection line so as to allow the external apparatus to access the storage; and a power controller for controlling power supply to the storage, wherein the system controller controls the power controller to initiate supply of a power to the storage after establishing a communication linkage with the external apparatus through the connection line.

Abstract: A storage system that functions as one or more logical volumes includes a control unit and a plurality of storage units connected to the control unit, wherein the control unit includes a memory that stores allocation status information that indicates status of allocation of the plurality of storage units to a logical volume; an access request responding unit that controls at least one storage unit among the plurality of storage units in response to a request for access to each logical volume from a host device; and a power saving controller that identifies an unused storage unit not allocated to any logical volume among the plurality of storage units on the basis of the allocation status information and performs power saving control on the identified unused storage unit.

Abstract: A storage system includes: a basic apparatus for transmitting an access request through a data input line for transmitting data; and an extension apparatus for receiving an access request from the basic apparatus through the data input line, the extension apparatus including a storage for storing data and a controller for controlling the access request from the basic apparatus, wherein the basic apparatus superimposes a voltage to the data input line in accordance with the access request, and wherein the extension apparatus includes an upper input voltage detector for detecting the voltage superimposed on the upper data input line and includes a power controller for controlling the power supply to the controller on the basis of the detected voltage.

Abstract: A storage apparatus includes: a storage medium for storing data; a controller for controlling an access from an upper device to the storage medium through a data line for transmitting data; a detector for detecting a transition of an access signal for requesting access from the upper device through the data line; and a power controller for supplying power to the controller in accordance with a rate of the transition of the access signal detected by the detector.

Abstract: A storage system includes: a basic apparatus for transmitting an access request through a data input line for transmitting data; and an extension apparatus for receiving an access request from the basic apparatus through the data input line, the extension apparatus including a storage for storing data and a controller for controlling the access request from the basic apparatus, wherein the basic apparatus superimposes a voltage to the data input line in accordance with the access request, and wherein the extension apparatus includes an upper input voltage detector for detecting the voltage superimposed on the upper data input line and includes a power controller for controlling the power supply to the controller on the basis of the detected voltage.

Abstract: A storage apparatus connectable to an external apparatus through a connection line for data communication includes: a storage for storing data; a system controller for controlling data communication with the external apparatus through the connection line so as to allow the external apparatus to access the storage; and a power controller for controlling power supply to the storage, wherein the system controller controls the power controller to initiate supply of a power to the storage after establishing a communication linkage with the external apparatus through the connection line.

Abstract: An OOB sequence monitoring unit detects that an OOB sequence carried out between a base device as a superior device and a connection I/F which operates even if an extension device is in a standby state has proceeded to a given stage. Based on the detection by the OOB sequence monitoring unit, a power supply control unit instructs a starting power supply unit to supply power. When the extension device starts, the OOB sequence is carried out between the extension device and the connection I/F of another extension device in the same manner. As a result, extension devices are started in decreasing order from the extension device closest to the superior device.

Abstract: An apparatus and the like for transmitting data via an I2C bus, which is simple in structure and can yet accumulate data transmitted via the I2C bus, thereby to analyze errors in the I2C bus easily. The apparatus comprises a memory circuit 4 connected to the I2C bus that connects a master 1 and a slave 2. The initial I2C address of the memory circuit 4 is set to the same I2C address as that of the slave 2 in order to write data into the slave 2. The data to be written into the slave 2 is saved in the memory circuit 4, and the I2C address of the memory circuit is set back to the initial I2C address after the data has been written into the slave 2. Thus, the data can be stored in the memory circuit before it is written into the slave and can be read from the memory circuit without influencing the operation of reading data from the slave.