JPS6353657A - Volume save/restoration system - Google Patents

Abstract

PURPOSE:To lighten the burden imposed on a host computer system in terms of executing a save/restoration program by operating an external mechanical switch and instructing the save and restoration processing of a secondary storage medium. CONSTITUTION:It is assumed that a save switch 21 is pressed, and the host computer system 1 does not use the secondary storage medium 27. A decision means 23 gives instructions to execute saving volume contents to a program 26, which saves the contents of the medium 27 in the secondary storage medium 28 dedicated to saving and restoration. During the execution of saving, a rejection means 24 rejects an access request from the host 1, and upon the completion of the saving action a permission means 25 permits the access request. If a restoration switch 22 is pressed and the host 1 does not use the medium 27, the decision means 23 gives instructions to execute restoring the volume contents to the program 26. The contents of the medium 28 are loaded onto medium 27, and said contentes are restored.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a volume save/restore method in a computer system.

(Prior Art) Conventionally, in a secondary storage medium such as a magnetic disk in a computer system, data can be saved/restored by starting an evacuation/restoration program on a host computer.
I was running a restore.

(Problems to be Solved by the Invention) The method of executing the save/restore program on the host computer system increases the load on the central processing unit of the host computer system, affects the execution of other processing programs, and The disadvantage is that the evacuation program itself is also influenced by other programs.

Furthermore, when a plurality of save/restore programs are executed simultaneously, the execution speed of each program becomes slow.

The purpose of the present invention is to operate a mechanical switch to determine whether or not the host computer is using the device, and if the host computer is not using the device, to reject future usage requests from the host computer. To eliminate the above disadvantages and increase the load on the central processing unit by starting a backup/restore program to execute the backup/restore process, and allowing usage requests from the host computer after the execution is completed. The purpose of the present invention is to provide a volume evacuation/restore method that is configured so that no data is generated.

(Means for Solving the Problems) The volume backup/restore method according to the present invention includes a save switch, a restore switch, a secondary storage medium, a determination means, a refusal means, and a permission means. It is something.

The save switch is a mechanical switch exclusively used for evacuation instructions, and the restore switch is a mechanical switch exclusively used for restoring instructions.

The secondary storage medium includes an area for storing the save/restore program.

The determining means is for determining whether or not the secondary storage medium is being used by the host computer system.

The rejecting means is for rejecting usage requests from the host computer from now on when the host computer is not being used.

The permission means is for permitting a usage request from the host computer after the execution of the save/restore process is completed.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the volume evacuation/restoration method according to the present invention. In FIG. 1, 1 is a host computer system, 2 is a secondary storage device, 21 is a save switch, 22 is a restore switch,
23 is a determination means, 24 is a refusal means, 25 is a permission means, 2
6 is an evacuation/restore program, 27 is a secondary storage medium, 28
is a secondary storage medium exclusively for saving/restoring.

Secondary storage device 2 connected to host computer 1
includes a save switch 21 which is a mechanical switch exclusively for evacuation instructions, a restore switch 22 which is a mechanical switch exclusively for restore instructions, a determining means 23, and a rejecting means 24.
It includes a permission means 25, an evacuation/restoration program 267, a secondary storage medium 27, and a secondary storage medium 28 exclusively for evacuation/restoration.

Assume that the save switch 21 is pressed by the operator. Host computer system 1 is a secondary storage medium 2
7 is not in use, the determining means 23 instructs the evacuation/restoration program 26 to execute volume content evacuation, and saves the contents of the secondary storage medium 27 (for example, a magnetic disk volume) to a dedicated storage/restorer. The next storage medium 28 (eg, magnetic tape volume) is saved.

While the volume contents are being saved, an access request sent from the host computer system 1 onto the signal line 100 is rejected by the rejecting means 24. After the evacuation operation is completed, the permission means 25 permits access requests from the host computer system 1.

Similarly, assume that the restore switch 22 is pressed by the operator. If the host computer system 1 is not using the secondary storage medium 27, the determining means 23 instructs the evacuation/restoration program 26 to execute volume content restoration, and the secondary storage medium 28 (e.g. , magnetic tape volume) to secondary storage medium 2.
7 (for example, a magnetic disk volume) to restore the contents.

While the volume content restoration operation is being performed, access requests from the host computer system 1 are rejected by the denying means 24. After the restoration operation is completed, access from the host computer system 1 is permitted by the permission means 25.

From the host computer system 1, the secondary storage medium 27
When access becomes necessary, an access request (resource reservation request) is sent on the signal line 100, and when access becomes unnecessary, an access release request (resource release request) is sent on the signal line 110.

When an access request is sent from the host computer system 1, the secondary storage device 2 is in the process of saving/restoring, and the host computer system 1 enters the waiting state, the processing in the secondary storage device 2 is completed. After that, the waiting state is canceled by a permission signal sent on the signal line 120 by the permission means 25, and the access request can be sent again.

(Effects of the Invention) As explained above, the present invention enables the evacuation/restoration process of a secondary storage medium executed by a secondary storage medium dedicated for evacuation/restoration and an evacuation/restoration program to be performed using an external mechanical switch. By operating and giving instructions, it is possible to improve the operability and reduce the load of executing the save/restore program on the host computer system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the volume evacuation/restoration method according to the present invention. 1...Host computer system 2...Secondary storage device 21.22...Switch 23...Discrimination means 24...Rejection means 25...Permission means 26...Evacuation/restore program 27. 28...Secondary storage medium

Claims (1)

[Claims] A mechanical save switch exclusively for evacuation instructions, a mechanical restore switch exclusively for restoring instructions, a secondary storage medium including an area for storing an evacuation/restore program, and the secondary storage medium used by a host computer system. a determination means for determining whether or not the host computer is in a state where the host computer is in use, a refusal means for rejecting a usage request from the host computer from now on when the host computer is not using the computer; A volume saving/restoring method comprising: a permission means for permitting a usage request from the host computer system after completion of execution of the volume saving/restoring method.