JPH02227750A - File back-up system - Google Patents

Abstract

PURPOSE:To reduce the memory capacity and the processing time for back-up by setting the priority to each file in response to the importance of each file and backing up only the files having priorities higher than a prescribed level. CONSTITUTION:When a new file is produced to a magnetic disk device 2, a job control language or a command is inputted via an input device 1. At the same time, the real file name and various file attributes are set at a control information table of a volume scale 3. Then a priority setting means 5 is started to set the priority to the control information table of the scale 3. When a back-up instruction is inputted to the device 1, a back-up means 6 takes the priority out of the control information table of a file in the scale 3 and then takes the file shown in a relevant name out of the device 2 to store it in a magnetic tape device 7 if the priority of the file is higher than the back-up level.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a computer system in which files stored in a storage medium are periodically saved to another storage medium, and the priority level (importance level) of files is ) in which files to be saved are determined based on a file backup method.

(Prior Art) Generally, in a computer system, when a file stored on a storage medium (e.g., magnetic disk device, etc.) is destroyed for some reason (e.g., a hard failure, etc.), a file is created to enable recovery of the file. is saved to another storage medium.

Conventionally, this saving process unconditionally saves all files stored in the volume list (for example, disk pack) of the storage medium.

(Problem to be Solved by the Invention) As mentioned above, in the conventional file backup method that backs up all files in a volume catalog, files that are not very important or files that do not need to be backed up are also backed up at the same time. It ends up. Therefore, there are disadvantages in that a device with a large storage capacity is required as a backup file, and a lot of time is required for backup processing. As described above, there are problems that need to be solved with conventional file backup methods.

The present invention has been made in view of these circumstances, and its purpose is to provide a file that can reduce storage capacity and backup processing time by backing up files with a specified priority order. The purpose is to provide a backup method.

(Means for Solving the Problems) In order to achieve the above object, the file backup method of the present invention provides, in a system in which files stored in a storage unit A, are regularly saved to another storage medium, a volume catalog in which the save order of each of the files is set; an input means for inputting the save order; and when saving the file stored in the storage medium to the another storage medium, and backup means for saving the files whose priorities are higher than a predetermined priority to the other storage medium.

(Function) In the file backup method of the present invention, when the input means inputs the save order, the backup means, when saving the files stored in the storage medium to another storage medium, selects the priority order in the volume list. saves files with a predetermined priority or higher to another storage medium.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, 1 is an input device through which the operator inputs JCL (Job Control Language) or commands, 2 is a magnetic disk device, and 3 is a management information table for each file, including real file names, priorities for backup, and various other information. A volume catalog (referred to as VTOC) including file attributes, 4 generates a file in the disk drive W2 based on the JCL or command input to the input device
An operating system sets the actual file name and various file attributes of the file in the management information table of the TOC 3, and 5 is a priority setting means for setting priorities in the management information table of the VTOC 3 corresponding to the file generated by the operating system 4. , 6 is a backup means for saving files in the magnetic disk device 2 to the magnetic tape device 7 based on the management information table of the VTOC 3 in response to a backup instruction from the input device 1.

FIG. 2 is a flowchart showing an example of processing by the priority setting means 5, and FIG. 3 is a flowchart showing an example of processing by the backup means 6.

The operation of this embodiment will be explained below using each country.

In the embodiment shown in FIG. 1, when creating a new file on the magnetic disk device 2, the operating system inputs a JCL or command that includes the real file name of the file, file attributes, backup priority, etc. as parameters to the input device. Enter from 1. Then, a file is generated in the magnetic disk device 2, and the actual file name and various file attributes of the file are set in the management information table of the VTOC 3. Next, the priority means 5 is activated.

The activated priority setting means 5 extracts the backup priority from the JCLt or the parameters in the command in step S1, as shown in FIG. Then, in step S2, priorities are set in the management information table of the VTOC 3.

Next, the operation when backing up files stored in the magnetic disk device 2 to the magnetic tape device 7 will be explained. When the user inputs a backup instruction into the input device 1, the backup means 6 receives the backup instruction and performs the processing shown in FIG. First, in step 310, the backup priority level input as a parameter in the backup instruction is input. Next, in step Sll, the priority is extracted from the management information table of one file from within the VTOC3, and step 812
It is determined whether the priority is higher than or equal to the backup priority. If the priority is higher than the backup priority, the file indicated by the file name of the file is taken out from the magnetic disk drive W2 and stored in the magnetic tape device 7 in step 313. On the other hand, if the priority is lower than the back priority, the file is not saved. Then, in step 814, it is determined whether there are any files that have not been processed. If there are files that have not been processed,
Returning to step 311, the process described above is repeated. If there are no files to process, the process ends.

(Effects of the Invention) As explained above, the file backup method of the present invention assigns a priority to each file according to its importance and backs up only files with a predetermined priority or higher. The capacity can be reduced, and ■backup processing time can also be reduced.

In addition, it is possible to back up files with high priority every short period of time, and files with low priority every long period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing an example of processing by the priority setting means 5, and FIG. 3 is a flowchart showing an example of processing by the backup means 6. DESCRIPTION OF SYMBOLS 1... Input device, 2... Magnetic disk, 3... Volume catalog (VTOC), 4... Operating system, 5... Priority setting means, 6... Backup means, 7...・Magnetic tape device.

Claims (1)

[Claims] In a system in which files stored in a storage medium are periodically saved to another storage medium, a volume list in which the save order of each file is set and the save order are input. input means; when saving the files stored in the storage medium to the other storage medium, saving the files whose priority in the volume list is equal to or higher than a predetermined priority to the other storage medium; A file backup method characterized by providing a backup means.