Abstract: A control device of the present invention includes: a storage part which retains a storage device list including an operation performance of each storage device and a power consumption corresponding to the operation performance; and a configuration determination part which, on the basis of the storage device list, determines a storage device combination configuration realizing the minimum power consumption of the whole logical volume formed of a combination of storage devices when the logical volume operates under a set operation performance condition.

Abstract: A control device of the present invention includes: a storage part which retains a storage device list including an operation performance of each storage device and a power consumption corresponding to the operation performance; and a configuration determination part which, on the basis of the storage device list, determines a storage device combination configuration realizing the minimum power consumption of the whole logical volume formed of a combination of storage devices when the logical volume operates under a set operation performance condition.

Abstract: A power supply device includes a power conversion circuit, a secondary battery, and a control circuit. The power conversion circuit converts alternating-current or direct-current power into direct-current power to supply power to a load. The secondary battery is connected between the power conversion circuit and the load and charged with power from the power conversion circuit so that power is supplied to the load when the charging power is discharged. The control circuit controls the power supply device to perform a first operation that, after the charging of the secondary battery, supply of input power into said power conversion circuit is halted and the secondary battery supplies the power accumulated by said charging to said load.

Abstract: The present invention provides a computer switching device that can easily monitor a plurality of computers for errors. A keyboard connection switch distributes the input operation information of keyboard over the plurality of computers in accordance with an instruction of a switching control device. A mouse connection switch distributes the input operation information of mouse over the plurality of computers in accordance with an instruction of the switching control device. A frame buffer buffers a screen from the VGA output of each computer. An image synthesis device forms an image by synthesizing the screens from the VGA outputs of the computers in accordance with an instruction of the switching control device.

Abstract: A power supply device includes a power conversion circuit, a secondary battery, a table, and a control circuit. The power conversion circuit converts alternating-current or direct-current power into direct-current power to supply power to a load. The secondary battery is connected between the power conversion circuit and the load and charged with power from the power conversion circuit so that power is supplied to the load when the charging power is discharged. On the table, power conversion efficiency of the power conversion circuit associated with output power and charging efficiency of the secondary battery associated with charging power are recorded.

Abstract: The present invention provides a computer switching device that can easily monitor a plurality of computers for errors. A keyboard connection switch distributes the input operation information of keyboard over the plurality of computers in accordance with an instruction of a switching control device. A mouse connection switch distributes the input operation information of mouse over the plurality of computers in accordance with an instruction of the switching control device. A frame buffer buffers a screen from the VGA output of each computer. An image synthesis device forms an image by synthesizing the screens from the VGA outputs of the computers in accordance with an instruction of the switching control device.