JPH04238151A - Disk device - Google Patents

Abstract

PURPOSE:To prevent data loss by speeding up processing by using a disk drive and by writing the data onto a disk for backup simultaneously with writing of the data onto a master disk. CONSTITUTION:A disk drive control section 11 executes control with the instruction of a body. The master disk drive 12 stores received information and a backup processing deciding circuit 15 drives a switch 14 for backup processing with writing instruction detection signals 1-A. The backup processing deciding circuit 15 stores the information into the disk drive 16 for backup processing by a writing permission signal 1-B. The deciding circuit 15 does not store the same information as the information written into the master disk when there is no write permission signal 1-B. The disk device is normally driven by an AC power source section 13 and is driven by a battery power source 17 in the event of a service interruption.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device, and more particularly to a disk device that is required to store important data that requires backup processing.

0002

2. Description of the Related Art Conventionally, disk devices requiring this type of backup processing device have used cartridge magnetic tape devices, cassette magnetic tape devices, etc. for backup storage to perform data backup processing.

0003

[Problems to be Solved by the Invention] The above-mentioned conventional backup processing device for disk devices uses slow processing speed devices such as cartridge magnetic tape devices and cassette magnetic tape devices to perform backup processing. Therefore, it took a considerable amount of time to perform the backup process. Furthermore, in order to carry out backup processing, the operation is temporarily interrupted and the backup processing is performed by an operator. As described above, conventional backup processing has the drawback of requiring a considerable amount of time. Furthermore, since it was done manually, there was a risk that important data could be lost due to operator error.

0004

[Means for Solving the Problems] A disk device of the present invention includes means for controlling a disk drive by an external command, a master disk drive for storing data, and a master disk drive for storing data.
A power supply for supplying the necessary power to the master disk drive, a means for determining whether data backup processing is to be performed, a data backup processing disk drive, and a battery power supply necessary for the backup processing disk drive. have

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention. Figure 1
11 is a disk drive control unit, 12 is a master disk drive, 13 is a power supply unit, 14 is a backup processing changeover switch circuit, 15 is a backup processing determination circuit, 16 is a backup processing disk drive, 17 is a battery power supply unit, 18 is a disk device including the above-described configuration, 1-A is a WRITE command detection signal, and 1-B is a write permission signal.

Next, the operation of this embodiment will be explained. The disk drive control unit 11 controls the disk drive according to commands from a main unit (not shown). The master disk drive 12 stores data sent from the main device, and sends data required by the main device to the main device. The backup processing determination circuit 15 determines whether the main unit is WRITE.
At the time of command, WRITE is sent from the disk drive control unit 11.
If the command detection signal 1-A is sent out and the backup processing changeover switch circuit 14 is in the backup processing permission state, the write permission signal 1-B is sent out, and the backup processing determination circuit 15 receives the write permission signal 1-B. As a result of the
to be memorized. If backup processing is not necessary, if the backup processing changeover switch circuit 14 is set to the backup processing prohibited state, even if the disk drive control unit 11 sends out the WRITE command detection signal 1-A, the backup processing changeover switch circuit 14 will be disabled. Since the circuit 14 is in the backup processing prohibited state, it does not send out the write permission signal 1-B. Therefore, the backup processing determination circuit 15
does not store the same data written in the master disk device in the backup processing disk drive 16. The power supply unit 13 is for supplying power to the master disk drive 12 and the backup processing disk drive 16. The backup processing disk drive 16 must always be supplied with power when the disk device 18 is powered on to protect data, so when the power supply unit 13 has AC input, power is not supplied from the power supply unit 13. When there is no AC input to the power supply section 13, power is supplied from the battery power supply section 17.

[0007]

As explained above, since the present invention uses a disk drive as a backup processing device for a disk device, the data processing speed is fast, and the disk drive for backup processing can be used at the same time as the master disk drive. Since it is writable, backup processing can be performed without interrupting business operations. Furthermore, since no human intervention is required, there is an effect of eliminating the drawback that important data may be lost due to operator error.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a disk device according to an embodiment of the present invention.

[Explanation of symbols]

11 Disk drive control section 12 Master disk drive 13 Power supply section 14 Backup processing changeover switch circuit 1
5 Backup processing determination circuit 16 Backup processing disk drive 17 Battery power supply unit 18 Disk device

Claims (2)

[Claims] 1. Means for controlling a disk drive by an external command, a master disk drive for storing data, a power source for supplying the necessary power to the master disk drive, and presence or absence of data backup processing. What is claimed is: 1. A disk device comprising: means for determining the data, a disk drive for data backup processing, and a battery power source necessary for the disk drive for backup processing. 2. A backup processing switching means for sending a write permission signal to the means for determining whether or not backup processing is to be performed when a WRITE command detection signal is input from the means for controlling the disk drive. The disk device according to claim 1.