JPS63147254A - System for setting access priority to shared dasd file - Google Patents

Abstract

PURPOSE:To suppress the accesses of a secondary system and to increase the processing efficiency of a main system by giving higher priorities to the accesses of the main system than those of the secondary system. CONSTITUTION:A control part setting means 11 sets previously the priority right information at access control parts 120 and 121 to designate the priorities of a 1st system #0 and a 2nd system #1 with respect to the files A in the shared DASD file devices 2-n respectively. When jobs are started in both systems #0 and #1, the job start display devices 130 and 131 are turned on. The conflict state display devices 140 and 141 are turned on when both devices 130 and 131 are kept on. The access frequency counting parts 150 and 151 count the access frequencies of those files A. Then the parts 120 and 121 control the priority right from the count results of the parts 150 and 151 and based on the priority right information given from the means 11 while both devices 140 and 141 are kept on. In such a way, the processing efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Summary) In a system in which system #O and system #1 access a shared DASD file device, system #0 and system #1
The data channels of both systems are connected to each other via an inter-system communication device, and the priority information input to both systems by the control unit setting means is provided. An access control unit that performs priority control based on information, a job startup indicator that displays whether or not a job to be executed in each system has started, and a job startup indicator that displays whether or not there is conflicting access to a specific file. A conflict status indicator for displaying the content and an access count counter for counting the number of accesses to a specific file of a job within a unit time are provided.

[Industrial application field]

The present invention relates to a method for prioritizing access to shared DASD files.

[Conventional technology]

DASD is an abbreviation for direct access storage device, and in the past, when a DASD file was accessed by two systems, that is, when a shared DASD file was accessed, the following method was used.

FIG. 3 is a diagram showing an example of a conventional access method for a shared DASD file.

In the diagram, #0 and #1 are respective systems, and 2 to 4 are shared DAS
It is a D file device. The same symbols represent the same objects throughout the following discussion.

In conventional bank office systems and the like, both system #O and system #1 often use shared DASD file devices 2-4. That is, if job α running on system #0 uses file A on shared DASD file device 2, and job β running on system #1 also uses file A on shared DASD file device 2, the conventional In this method, the job that is earlier in time uses file A preferentially.

[Problem that the invention seeks to solve]

However, for example, job α on system #0 is already shared D.
I am using file A on ASD file device 2,
However, when it takes a considerable amount of time, job β on system #1 only uses file A on shared DASD file device 2 for a short time.
There is a problem in that even if a user wishes to use the job α, he or she must wait until job α is completed.

[Means for solving problems]

The above problem is solved by the first system # as shown in the principle diagram in Figure 1.
0 and the second system #l share the DASD file device 2~
In the system accessing n, the first system #0
The data channel 160 of the second system #1 and the data channel 16I of the second system #1 are connected via the intersystem communication device 17, and the files A in the shared DASD file devices 2 to n are connected.
control unit setting means 11 for setting priority information specifying the priority order of the first system #0 and the second system #1;
Further, the first system #0 and the second system #1 are provided with access control units 120 and 128 that perform priority control based on priority information, respectively, and job start indicators 130 and 1.
33, the problem can be solved by providing conflict status indicators 140 and 141 and access count units 150 and 151.

[Effect]

According to the present invention, the shared D
The first file for file A in ASD file devices 2 to n
Priority information specifying the priority order of system #O and second system #1 is set in the access control units 120 and 121, and when a job is started in the first system #0 and second system #1, Job start indicators 130 and 131
is turned on, and when the job start indicators 130 and 131 are both turned on, the race condition indicators 140 and 141 are turned on, and the access count units 150 and 151 count the number of accesses to each file A, and the control unit setting means 11
Access control based on priority information entered by ? ff
11 parts 120 and 12. performs priority control.

〔Example〕

The present invention externally sets a more rational priority determination method during simultaneous access, and controls access according to this priority determination method.

FIG. 2 is a diagram illustrating an embodiment of the access priority setting method for a shared DASD file according to the present invention.

In the figure, 10 is a punch card, 11 is a control section setting means, 2 degrees, 12. are both access control units, 130 and 131
are both job start indicators, 140 and 141 are both conflict status indicators, 150 and 151 are both access count counters,
160 is the data channel of system #O; 16. is the data channel of system #1, 17 is the intersystem communication device (FSI), 20° is the main control unit of system #O, 2
0. is the main control unit of system #1.

According to the present invention, the percent priority is displayed for each file stored in the shared DASD file devices 2-n. Note that the shared DASD file devices 2 to n are shared DASD file devices for simplicity.
Only the D file device 2 is illustrated, and the others are omitted.

For example, assuming that the priority of system #0 for file A stored in the shared DASD file device 2 is 70%, and the priority of system #1 for the same file A is 30%, then system #0 within a unit time Read count for file A in 0 and file A in system #1
The ratio of the number of reads to the number of reads is controlled so that 7=3.

(In order to perform such control, priority information is bunched onto a punch card 10 and set in the control unit setting means 11, for example.

The control unit setting means 11 reads the priority information of the punch card 10 and sets the priority information in the access control unit 120 provided in the hardware system #0.

Similarly, the control section setting means 11 is the hardware system #1.
The same priority information is sent to the access control unit 12+ within the access control unit 12+.

In this way, the access control unit 12o and the access control unit 1 are connected in advance.
Set priority information to 2+.

(b) Now in system #0, when the main control unit 20° starts job α, job α notifies the access control unit 120 of the activation of job α.

Upon receiving this notification, the access control unit 120 first turns on the job start indicator 3°, and then turns on the data channel 16o to the intersystem communication device 17 to the data channel 1.
Access control unit 12 via the 6+ route (hereinafter referred to as route Z)
．． , and checks whether job β has already turned on the job start indicator 131 on the system #1 side.

If job start indicator 13. When is off, there is no conflict, so the conflict status indicator 140 is turned off.

If the job activation indicator 131 is on, there is a conflict, so both the conflict status indicators 140 and 141 are turned on, and the access count units 150 and 151 are both initialized to a countable state.

In addition, the competition status indicator 14. For both the operation of turning on the access count counter 151 and the operation of initializing the access count counter 151 to enable counting, the access control unit 120 uses the access control unit 12. This is done by accessing.

In the state where the above processing is performed, the job start indicator 13
If 0 is on and the job start indicator 131 is off, there is no conflict, so the access control unit 120 does not perform priority processing. Therefore, even if file A is accessed by job α, it will be processed in the same procedure as a file not to be monitored.

When both the job activation indicator 130 and the job activation indicator 131 are on, that is, when the conflict status indicators 140 and 141 are both on, the access control unit 120 and the access control unit 12. performs priority processing.

(C) When job α accesses a file during execution, job α checks whether the accessed file is a monitored file, and if it is a non-monitored file, it is the same as accessing a normal file. However, if the file A is to be monitored, the access control unit 120 is accessed first.

The access control unit 120 has the contention status indicator 1 as described above.
Priority control is performed only when both 40 and 14+ are on.

The access control unit 120 accesses the access control unit 12+ via route Z and checks whether job β on the system #l side is accessing file 8.

If the access is not in progress, job α accesses file A, and when it is finished, access count counter 1
Add 1 to 50.

If access is in progress, priority control is performed.

The priority control process uses the count value n0 of the access count counter 150 and the count value n of the access count count unit 151.

Read noX (% of #O) and n, x (% of #t)
It compares the size of and gives priority to the larger one.If noX (% of #O) is small, it waits and no
When (% of #0) is large, wait for the end of block processing of job β, issue an interrupt, access file A,
Upon completion, the access count counter 150 is incremented by 1.

In the above explanation, there are two systems #O and #1, but even if there are two or more systems, priority can be given in the same way, and priority can be given to jobs. It is possible to do so.

〔Effect of the invention〕

As described above in detail, the present invention has the great effect that by prioritizing access from the main system, it is possible to suppress access from the secondary system and improve the processing efficiency of the main system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention. FIG. 2 is a diagram showing an embodiment of the access priority setting method for a shared DA'SD file according to the present invention. FIG. 3 is a diagram showing an example of a conventional access method for a shared DASD file. In the figure, #0 and #1 are respective systems, 2.3.4~ are respective shared DASD file devices, 10 is a punch card, 1
1 is a control unit setting means; 120 and 121 are both access control units; 130 and 131 are both job starting indicators;
0, 14. are both race condition indicators, 150 and 151 are both access count counters, 160 is the data channel of system #0, 161 is the data channel of system #l, 17 is the intersystem communication device (FSI), and 20° is the system #1. The main control unit 0, 20, is the main control unit of system #l. Te (phantom)

Claims (1)

[Claims] The first system (#0) and the second system (#1) share D
In the system accessing the ASD file device (2 to n), the data channel (16_0) of the first system (#0)
) and the data channel (16
_1) is connected via the intersystem communication device (17), and the files (
A control section setting means (11) is provided for setting priority information specifying the priority order of the first system (#0) and the second system (#1) with respect to A), #0, #1), respectively, access control units (12_0, 12_1) that perform priority control based on the priority information input by the control unit setting means (11); and the first and second systems ( Job start indicators (13_0, 13_1) that display whether the jobs executed in #0, #1) have started, respectively, and whether or not there is a conflict between accesses of the jobs to the file (A). and an access count counter (15_0, 14_1) that counts the number of accesses to the file (A) of the job within a unit time.
0, 15_1) respectively.
Access priority setting method for SD files.