JPS58222364A - Access control system of disc device in terminal system - Google Patents

Abstract

PURPOSE:To improve the deterioration in the processing efficiency when a load is large, by providing an access control section dividing plural access requests into high/low priority levels and forming a queue table to a terminal controller. CONSTITUTION:When the request is an access request to a disc device 2 in a terminal system, the high or low priority level information corresponding to files or devices are set in file control blocks FCBs 8, 8' storing the control information for the file access attached to application programs AP16, AP26' of a terminal controller 1. When an access control section 5 receives an access request from AP1, AP2, the corresponding FCB is reference to acquire the priority level information and to divide the level into priority levels for the formation of a separate queue table 7, and the access to the device 2 is done in response to the priority level. Thus, a higher priority level to an access request giving effect on the operability of the operator especially, allowing to proceed smoothly the conversation type processing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves the reduction in processing efficiency caused by a delay in response when the disk device is heavily loaded in a system including a plurality of terminal devices and disk devices, such as a bank terminal system. Therefore, the present invention relates to an access control method that performs priority control on access requests to disk devices.

Background of the Technology When performing read/write access control to files on a disk device, a conventional terminal control device performs access request order (fLrzt-4rL-fJtrzt-
ou, t), and no priority control is performed. However, a large terminal control device that controls a large number of terminals.

Due to the high frequency of accesses, access requests connected at the end of the request queue may require a wait time of one second before being processed, so this is especially true for interactive In processing, there is a delay in the response on the display screen to the key input, which may confuse the operator, such as when an error message is returned with a delayed response to the key input, reducing operability. There was a case.

A specific example will be explained below.

FIG. 1 shows an example of the configuration of a terminal system. In the same figure,
1 is a terminal control device, 2 is a disk device, 3 is a printer,
4.4' is a terminal device in the form of a keyboard/display, keyboard/printer, or the like.

For example, in a bank terminal system, while running a spool job that prints out previously input transaction data from the printer 3 in batch processing, the terminal device 4 simultaneously prints out previously input transaction data.
．． Processing of online jobs such as 4' is performed. In such a case, the load on the disk device 2 increases due to access requests made by spool jobs to the disk device 2, which causes a decrease in response to access from online terminal devices. Some disk devices combine a high-speed fixed-head disk and a low-speed variable-head disk into one unit. FIG. 2 schematically shows this. In this case, the average access time to the fixed head area is, for example, 10 rnS, but the access time to the variable head area B is the seek time of the head, for example, 70 rnS.
Since m5 force j is required, it becomes 80 rfLS. However, access control for fixed heads and variable heads is unified, and areas A and B can only be distinguished by addresses. If a queue is formed, an access request to area A will have a waiting time of 160 m5 (80×2), and the high-speed access function of area A in the disk device cannot be used effectively.

Object and Structure of the Invention An object of the invention is to apply a priority control method to requests for access to a disk device in a terminal system, and in particular to prevent accesses that affect the operability of The purpose of this system is to give a high priority level to requests, thereby facilitating dialogue processing and improving overall throughput.

As a configuration for that purpose, the present invention includes a plurality of terminal devices,
Regarding a terminal system that honors a disk device and a terminal control device, the terminal control device has an access control unit that processes access requests to the disk device, and a queue table that manages multiple access requests to the disk device. The access control unit is characterized in that it divides a plurality of access requests into two priority levels, high and low, and creates separate queues, and processes the access requests with priority control.

Examples of the invention The present invention will be explained below based on examples.

The present invention allows access requests to disk devices to be
4, which processes according to the low priority level,
Many embodiments are available according to the scheme of assigning a priority level to each access request.

FIG. 3 is a block diagram of an embodiment of the present invention, which is based on the terminal system shown in FIG. 1 is a terminal control device, 2 is a disk device, 5 is an access control unit, 6.6' is an application program AP, ,A
P7 is the access request queue table, 8.8'
It represents FiFCB (File Control: Role Block).

In this embodiment, each application program 6.6'
Priority level information is set for files or devices in the PCB that is attached to the PCB and holds control information for file access, and the access control unit 5 handles access requests from each AP. When a PCB is received, priority level information is acquired by referring to the corresponding PCB, and a queue table 7 is created according to the priority level.

In this embodiment, the access control unit 5 is provided with a function to check the priority level of the received access request, but this can be sent to each AP, and when issuing an access request. It is also possible to add priority level information and send it.

In this case, the access control unit 5 can immediately create a two-level queue from the priority level information. Figure '4 shows a system that dynamically controls the priority level according to the resource usage situation. FIG. 3 is a configuration diagram of another embodiment. This figure is drawn to substantially correspond to FIG. 3. 9 is a resource management information processing unit, and 10 is a transfer buffer.

The resource management and information processing section 9 constantly collects resource usage information such as whether the transfer buffer 10 in the terminal control device is busy or the amount of remaining space, and the PCB corresponding to the access request registered in the queue table 7. Based on this information, the job type, safe buffer size, usable buffer space, etc. are checked, and access requests that are suitable for processing at that time and those that are inappropriate are classified. Then, it instructs the access control unit 5 to create or modify a queue by assigning a high/low priority level to each of them.

In addition, as another example of actual voice, the access control unit 5 has priority
Give... to! Therefore, there is a method of having a preset table and referring to it for priority control, or in a case like the example shown in Figure 2, an access request to fixed head area A is automatically identified from its physical address. do,
Can be given a high priority level.

Furthermore, it is also possible to provide a priority level setting function using commands and have the operator make instructions.

Effects of the Invention As described above, according to the present invention, it is possible to set the optimal priority level according to the job or resource usage information for requests for access to disk devices in the terminal system, and the operation method of the terminal device operator is improved. can be improved.

[Brief explanation of drawings]

Figure 1 shows the configuration of a terminal system, Figure 2 is an explanatory diagram of a disk device with a fixed head and a variable head, and Figures 3 and 4 are configuration diagrams of embodiments of the present invention.
Threat 0 In the figure, l is a terminal control device, 2 is a disk device, 5 is an access control unit, 6.61 is an application program,
7 represents the queue table and 8.81 represents the PCB. Patent Applicant: Fujitsu Ltd. Representative Patent Attorney Fumihiro Hase (1 other person) Sen 1 Illustration twice

Claims (1)

[Claims] Regarding a terminal system including a plurality of terminal devices, a disk device, and a terminal control device, the terminal control device includes an access control unit that processes access requests to the disk device, and manages multiple access requests to the disk device. and a queue table, and the access control unit includes:
An access control method for a disk device characterized in that a plurality of access requests are divided into two priority levels, high and low, and separate queues are created, and the access requests are processed with priority control.