JPS63204317A - Magnetic tape file processing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] The present invention provides a system in which, when the attached volume is not the first volume of a file, the media check unit of the data management unit of an information processing system displays a message to that effect on the operation console. an inquiry part that prompts the operator to make a decision, and allows the operator to proceed with the open process if there is a notification from the console that the file will be opened; A file that spans multiple magnetic tape volumes can be opened or closed on any volume by providing a normal termination processing section that handles normal termination when there is a notification that a file will be terminated normally. It is.

[Industrial application field]

The present invention relates to a magnetic tape file processing method in an information processing system.

[Conventional technology]

Magnetic tape volumes used in information processing systems include
A standard label format is defined. That is, a volume label is recorded at the beginning and end of each volume, and a file label is recorded at the beginning and end of each file.

When reading from or writing to such a magnetic tape volume, a data management unit of an operating system (hereinafter simply abbreviated as O8) identifies a desired file by referring to the volume label and file label.

In recent years, as various systems running on information processing systems have become larger in scale, the amount of data has also increased dramatically.
Examples are emerging in which one file exists across multiple magnetic tape volumes.

A magnetic tape volume has multiple volumes/volumes like this.
In addition to files with a single file structure, 1. There are various configurations, such as single volume/single file where only one file exists on one volume, and single volume/multiple files where multiple files exist on one volume, but in current information processing systems, files cannot be processed. If you do,
Always search for the desired record from the beginning of the file,
“End 0fFi” recorded at the end of the file
The process ends only when the "le" mark is found.

Although this is not a problem in normal business processing, there are times when it is necessary to process only specific records. Even in such cases, the current method searches for the desired record from the beginning of the file, and even if the file spans multiple volumes, the magnetic tape is read blankly from the beginning volume until the desired record is found. Even after the processing of a specific record is completed, in order to complete the process normally, it is necessary to idle read the magnetic tape until the end of the file is detected, which wastes time and is troublesome.

Even if you try to process only the volume where the desired record is recorded, the data management unit performs a sequence check, so if you do not set the first volume first, the sequence will be incorrect and an error will occur and the process will be executed. Can not do it.

[Problem that the invention seeks to solve]

As mentioned above, conventionally, in the case of a multiple volume/single file configuration, it was not possible to process only a specific volume.
This causes the inconvenience of being troublesome and consuming unnecessary time.

Therefore, an object of the present invention is to make it possible to process only a specific volume when one file exists across multiple volumes.

[Means for solving problems]

The present invention configures a part of an operating system that controls an information processing system, and stores multiple magnetic tape volumes under the control of a data management section that includes an open processing section, a close processing section, and a medium check section. When handling spanning files, when the media check section detects an abnormality in the serial number of the attached magnetic tape volume, a message is displayed on the console prompting the operator to decide what to do, and the console notifies the operator that it will open the file. In this case, when the inquiry section that causes the open processing section to open the magnetic tape volume and the operation console notify that a volume other than the final volume is to be closed,
By providing a normal termination processing section in the close processing section, it is possible to open or close any volume.

[For production]

If the volume attached when opening a file is not the first volume of the file, the media checker allows the file to be opened based on the command from the operator, and even if it is not the last volume, it also follows the command from the operator. By enabling close processing based on , when one file spans multiple magnetic tape volumes, it becomes possible to process only a specific volume.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1(a) and 1(bl).

Assume that an application program such as the user program 3 is attempting to process only a specific magnetic tape volume 5' among files spanning a plurality of magnetic tape volumes 5.

When this magnetic tape volume 5° is attached to a magnetic tape device (not shown) and the user program 3 is started to execute processing, the serial number management unit 8 in the media management unit 6 of the data management unit 2 The volume serial number is checked and
If this magnetic tape volume 5° is not the first volume of the file, conventionally a sequence error occurs as described above and the user program 3 cannot be run.

In this embodiment, as shown in FIG.
and a normal termination processing section 12. In the figure, 1 is an operating system composed of a data management section 2, etc., 4 is an operation console, 7 is an open processing section, and 9 is a close processing section.

In this embodiment, in such a case, the inquiry unit 11 displays a message on the display screen of the console 4 indicating that there is a sequence error.
and displays a message prompting the user to decide how to proceed. In this embodiment, since it is desired to process only the magnetic tape volume 5', the operator responds via the console 4 to open the currently installed volume.

The inquiry unit 11 executes the subsequent steps in accordance with the notification from the console 4, but in this case, it does not cause a sequence error and causes the open processing unit 7 to execute the open process for the volume 5°.

When the processing for the records in the magnetic tape volume 5'' is completed and the end of the volume is detected, the inquiry unit 11 determines whether to continue processing the next volume or to treat it as an end of file (EOF). A message is displayed on the console 4 inquiring whether the After satisfying the file termination conditions for normal termination, the close processing section 9 is made to perform the close processing of the user program 3. As a result, the user program 3 is terminated normally, which does not adversely affect the operation of the entire system. It will not affect you.

〔Effect of the invention〕

As explained above, according to the present invention, only the necessary volume can be handled without consideration in the program, so the processing time can be shortened and unnecessary handling time is eliminated.
Furthermore, a program for handling only a specific volume is simplified.

[Brief explanation of the drawing]

FIGS. 1A and 1B are detailed explanatory diagrams of the present invention. In the figures, 1 is an operating system, 2 is a data management unit, 3 is an application program such as a user program, 4 is an operator console, 5,5゛ is the magnetic tape volume,
6 is a medium check section, 7 is an open processing section, 8 is a serial number management section, 9 is a close processing section, 11 is an inquiry section, 12
indicates the normal termination processing section. One embodiment of the present invention is shown in FIG. 1.

Claims (1)

[Claims] An open processing unit (7) that combines files stored in magnetic tape volumes (5, 5') with an application program (3) to create an environment in which records can be input/output; A data management unit (2) comprising a close processing unit (9) that separates files and application programs that have been combined by the processing unit, and a medium check unit (6) that manages serial numbers of magnetic tape volumes that input and output records. ), the medium check unit (6) checks the magnetic tape volume (5') mounted in accordance with the request of the application program (3).
When an abnormality is detected in the serial number of the magnetic tape volume (5'), the operation console (4) displays a message prompting a decision, and when the operation console notifies that the magnetic tape volume (5') is to be opened, the open processing section (7) ) to open the magnetic tape volume (5').
1) and the magnetic tape volume (
If you receive a notice to close 5'),
After performing the file termination procedure, the close processing section (9
) is provided with a normal termination processing unit (12) that closes the application program (3), thereby making it possible to open and close files existing across multiple magnetic tape volumes on any volume. A method for processing magnetic tape files.