JPH0668717B2 - Magnetic tape file processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] According to the present invention, when the mounted volume is not the head volume of a file, the medium check section of the data management section of the information processing system displays that fact on the operator console. The inquiry part that prompts the operator to make a decision, and if there is a notification to open from the console, it will open the process as it is, and when the end of the volume is detected, it will close from the console even if it is not the end of the file When a notification to that effect is sent, a normal termination processing unit that handles the normal termination is provided, so that files that span multiple magnetic tape volumes can be opened or closed with any volume. is there.

[Industrial application field]

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

[Conventional technology]

Magnetic tape volume used in information processing system,
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 / writing such a magnetic tape volume, a data management unit of an operating system (hereinafter simply referred to as OS) refers to the volume label and the file label to identify a desired file.

With the recent increase in the scale of various systems operating on information processing systems, the amount of data has increased dramatically,
There is an example in which one file exists across a plurality of magnetic tape volumes.

For magnetic tape volume, multiple volumes such as
In addition to files with a single file structure, a single volume / single file in which only one file exists on one volume,
There are various configurations such as single volume / multiple files in which multiple files exist on one volume. In the current information processing system, when processing a file, the desired record is always searched from the beginning of the file. , 'End Of Fil' recorded at the end of the file
The process is ended when the e'mark is found.

This is fine for normal business processing, but sometimes it may be necessary to process only specific records. Even in such a case, the current method of searching for the desired record from the beginning of the file is such that even if the file spans multiple volumes, the magnetic tape is idle read until the desired record is found in order from the beginning volume. Therefore, even after the processing of the specific record is completed, it is necessary to idle-read the magnetic tape until the end of the file is detected in order to end normally, which consumes wasteful time and is troublesome.

Therefore, even if you try to process only the volume in which the desired record is recorded, the data management section performs a sequence check.If you do not set the first volume first, an error occurs because the sequence is not normal and the process is executed. Can not do it.

[Problems to be Solved by the Invention] As described above, conventionally, in the case of a multiple volume / single file configuration, only a specific volume cannot be processed,
There is an inconvenience that it is troublesome and wastes time.

Therefore, it is an object of the present invention to enable processing of only a specific volume when one file exists across a plurality of volumes.

[Means for solving problems]

The present invention constitutes a part of an operating system for controlling an information processing system, and controls a plurality of magnetic tape volumes under the control of a data management unit including an open processing unit, a close processing unit and a medium checking unit. When handling a straddling file, the medium check section displayed a message prompting the operator to judge the action when an abnormality was detected in the serial number of the mounted magnetic tape volume, and the operator console notified that the file should be opened. In this case, when the inquiring section for opening the magnetic tape volume in the open processing section and the operator console to close the volume other than the final volume are notified,
By providing a normal end processing unit for normal termination in the close processing unit, it is possible to open or close with any volume.

[Action]

The medium check part, if the volume mounted when opening a file is not the top volume of the file, it will be able to open as it is based on the command from the operator, and even if it is not the final volume, this will also be the command of the operator. By enabling the close processing based on the above, it becomes possible to process only a specific volume when one file spans a plurality of magnetic tape volumes.

〔Example〕

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

Now, it is assumed that an application program such as the user program 3 is going to process only a specific magnetic tape volume 5 ′ among the files extending over the plurality of magnetic tape volumes 5.

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

In this embodiment, as shown in FIG. 2B, the medium check unit 6 of the data management unit 2 is additionally provided with an inquiry unit 11 and a normal termination processing unit 12. In the figure, 1 is an operating system including a data management unit 2 and 4
Is an operation console, 7 is an open processing unit, and 9 is a close processing unit.

In this case, in the present embodiment, the inquiry unit 11 displays a message on the display screen of the operator console 4 for prompting the user to judge that there is a sequence error and how to deal with it. In this embodiment, since it is desired to process only the magnetic tape volume 5 ', the operator replies via the console 4 that the volume currently mounted is opened here.

The inquiry unit 11 executes the subsequent processing according to the notification from the operator console 4. In this case, the open processing unit 7 causes the open processing unit 7 to execute the open processing without causing a sequence error.

When the processing for the record in the magnetic tape volume 5'is completed and the end of the volume is detected, the inquiry unit 11 continues to process the next volume or handles the end of file (EOF). A message asking whether to do this is displayed on the console 4. Here, when the operator gives a command to close via the console 4, the inquiry unit 11 transfers it to the normal end processing unit 12, and the normal end processing unit 12 establishes a file end condition for normal end. After that, the close processing unit 9 is caused to perform the close processing of the user program 3. As a result, the user program 3 ends normally, so that the operation of the entire system is not adversely affected.

〔The invention's effect〕

As described above, according to the present invention, only a necessary volume can be handled without considering it by a program, so that the processing time can be shortened and unnecessary handling time can be eliminated.
Also, the program for handling only the specific volume is simplified.

[Brief description of drawings]

1 (a) and 1 (b) are explanatory views of an embodiment of the present invention. In the figure, 1 is an operating system, 2 is a data management unit, 3 is an application program such as a user program, 4 is a console, 5 and 5'are magnetic tape volumes, 6
Is a medium check unit, 7 is an open processing unit, 8 is a serial number management unit, 9 is a close processing unit, 11 is an inquiry unit, and 12 is a normal end processing unit.

Claims (1)

[Claims] 1. An open processing unit (7) for creating an environment in which records can be input / output by combining files stored in a magnetic tape volume (5, 5 ′) with an application program (3),
A data management unit including a close processing unit (9) for separating the file and the application program combined by the open processing unit and a medium check unit (6) for managing the serial number of the magnetic tape volume for inputting and outputting records. In (2), when the medium check unit (6) detects an abnormality in the serial number of the magnetic tape volume (5 ') mounted according to the request of the application program (3), prompts the operator (4) to make a judgment. When a message is displayed and the operator console notifies that the magnetic tape volume (5 ') is to be opened, the inquiry section (11) for opening the magnetic tape volume (5') in the open processing section (7). And the magnetic tape volume opened from the console
If you receive a notice to close (5 '),
After the end of file is processed, the close processing unit (9)
A normal termination processing unit (12) for closing the application program (3) is provided in the magnetic field, and files existing over multiple magnetic tape volumes can be opened and closed by any volume. Tape file processing method.