JPS63276131A - System for diagnosing duplex shared input/output device - Google Patents

Abstract

PURPOSE:To realize the diagnosis in an on-line state for a duplex shared input/ output device by registering a diagnostic program into a control table for input/ output objects and executing immediately the input/output request given to an area excluding the corresponding one from a general processing program. CONSTITUTION:An input/output request is accepted by an input/output accepting means 11 and this requester is discriminated by an input/output request decision/ control means 12. When the requester is coincident with a diagnostic program 2, the input/output object area is registered in a duplex diagnosing managing table 14 as an under-diagnosing area. Then an input/output request is produced to a duplex shared input/output device 4. When the requester is coincident with a general processing program 1, an input/output request is produced immediately as long as the relevant input/output request is not given to the under- diagnosing area. While an input/output request waiting means 15 is started when said input/output request is given to the under-diagnosing area. Then this area is released by the program 2 and an input/output request is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for diagnosing a duplex shared input/output device installed in a computer system or the like.

In conventional technology electronic computer systems, the shared input/output device shared by various processing programs executed within the central processing unit has a duplex configuration consisting of a main device and a subdevice. There is a type in which diagnosis for purposes such as preventive maintenance is performed from a central processing unit.

Conventionally, when diagnosing the duplex shared input/output device as described above, in order to prevent data inconsistencies due to input/output conflicts with other processing programs, the diagnostic target is limited to a predetermined area, or Diagnosis items are limited to reading tests, or the duplex shared configuration is temporarily canceled and assigned only to the diagnostic program.

Problems to be Solved by the Invention Among the conventional diagnostic methods mentioned above, those that limit the diagnostic target to a predetermined area or limit the diagnostic items to only reading tests cannot be used for all areas and all functions of the input/output device. There is a problem in that it is not possible to perform a diagnosis and sufficient preventive maintenance cannot be performed.

Furthermore, a diagnostic method in which the duplex shared configuration is temporarily canceled and assigned only to a diagnostic program cannot be applied to a running state of a general processing program. Therefore, there is a problem in that the electronic computer system must be temporarily stopped, and the continuity of system operation must be sacrificed.

Means for Solving Problems According to the diagnosis method of the duplex shared input/output device according to the present invention, if the input/output request is from a diagnostic program, the area to be input/output is registered as the area under diagnosis in the duplex diagnosis management table. If this input/output request is from a general program and is not for the area under diagnosis, immediately issues this input/output request, and if this input/output request is from a general program, immediately issues this input/output request. The input/output control device is equipped with an input/output request determination/control means that waits for the area under diagnosis to be released by the diagnostic program and then issues the input/output request when the request is for the area under diagnosis. Rather than giving priority to a program and allowing competition in input/output requests between this program and general processing programs, the system is configured to enable diagnosis in an online state without limiting diagnostic areas or items.

Hereinafter, the operation of the present invention will be explained in detail together with examples.

Embodiment FIG. 1 is a conceptual diagram of a diagnostic method for a duplex shared input/output device according to an embodiment of the present invention, where l is a general processing program, 2 is a diagnostic program, 3 is an input/output control device,
4 is a duplex shared input/output device 4;

The diagnostic program 2 diagnoses the duplex shared input/output device 4 in a cycle of saving data from the area to be diagnosed, executing a test, and restoring the saved data. Further, the general processing program 1 is a business processing program other than the above-mentioned diagnostic program 2, and competes with the diagnostic program 2 while sharing the dual-configured input/output device.

The input/output control device 3 includes input/output request reception means 11, input/output request determination/control means 12, input/output request issuing means 13,
It is composed of a duplex diagnosis management table 14, an input/output request waiting means 15, and an input/output request restarting means 16.

The duplex diagnosis management table 14, as illustrated in FIG. 2, consists of information regarding the diagnosis status including the address of the main device under diagnosis, the address of the sub device, the duplex status flag, the diagnosis device address, and the diagnosis device diagnosis area address. Each entry of information regarding this diagnostic status is used to determine the input/output request each time an input/output request from the diagnostic program 2 occurs.
The control means 12 manages registration, reference, deletion, etc.

When receiving competing input/output requests from the general processing program 1 and the diagnostic program 2, the input/output request receiving means 11 in the human output control device 3 includes input/output request discrimination/controlling means along with the request source identification information. Control is passed to 12.

The input/output request determining/controlling means 12 activated by the input/output request receiving means 11 starts determination/control processing of the procedure illustrated in the flowchart of FIG.

That is, in the first step 31, the input/output request determination/control means 12 determines the request source of the input/output request based on the request source identification information passed from the input/output request reception means 11, and this determines the request source of the input/output request based on the request source identification information passed from the input/output request means 11. If it is 1, the process proceeds to step 32, where it is determined with reference to the duplex diagnosis management table 14 whether or not the diagnosis is for the duplex shared device being diagnosed. If the input/output request is not for the duplex shared device being diagnosed, the input/output request determining/controlling means 12 immediately proceeds to step 33, and the input/output request issuing means 1
3 and finish the process.

When the input/output request determination/control means 12 determines in step 32 that the input/output request is for the duplex shared device under diagnosis, the process proceeds to step i4, and determines whether this is an input/output request for the area under diagnosis. It is determined by referring to the duplex diagnosis management table 14 whether or not the duplex diagnosis management table 14 is present. If the input/output request is not for the area under diagnosis, the input/output request determining/controlling means 12 proceeds to step 33, starts the input/output request issuing means 13, and ends the process.

On the other hand, the input/output request determination/control means 12 determines in step 3 that the input/output request is for the area under diagnosis.
If the determination is made in step 4, the process proceeds to step 35, where the input/output request waiting means 15 is activated and the process is terminated.

On the other hand, when the input/output request determination/control means 12 determines in step 31 that the input/output request is from the diagnostic program 2, the process proceeds to step 36, and determines whether or not this is a request to terminate the diagnosis. Determine whether If this input/output request is not a request to end diagnosis but a request for a new diagnosis, the input/output request determination/control means 12 proceeds to step 37 and inputs the address of the input/output device to be diagnosed and the diagnosis in this input/output device. The area address is set in the duplex diagnosis management table 14. Thereafter, the process of the input/output request determining/controlling means 12 proceeds to step 33, where the input/output request issuing means 13 is activated, and then ends.

On the other hand, the input/output request determination/control means 12 performs step 36.
If the input/output request determined in step 3 is a diagnosis termination request, the process proceeds to step 38, in which the corresponding entry is deleted from the duplex diagnosis management table 14, and then the process proceeds to step 39. In step 39, the input/output request determination/control means 12 determines whether there is an input/output request in a restartable waiting state regarding the entry deleted from the duplex diagnosis management table 14 upon completion of the diagnosis, and determines whether or not this exists. Then, the process proceeds to step 40, where the input/output request restart means 13 is started, and then the process is ended. On the other hand, if there is no input/output request from such a restartable general program, the determination/control processing by the input/output request determination/control means 12 immediately ends.

The input/output request issuing means 13 activated in step 33 in FIG. 3 issues the corresponding input/output request to the duplex shared input/output device 4. Further, the input/output request waiting means 16 activated in step 35 sets input/output requests from general programs to the area under diagnosis to a waiting state for the end of the diagnosis.

Further, the input/output request restarting means 16 activated in step 40 releases the waiting state and activates the input/output request issuing means 13 regarding the input/output request from the general program for the area where the diagnosis has been completed.

Effects of the Invention As explained in detail above, the diagnosis method of the duplex shared input/output device according to the present invention prioritizes the diagnostic program by registering the diagnosis execution status in the duplex diagnosis management table and referring to it, while also distinguishing between the diagnosis program and the general one. Since the configuration allows competition of input/output requests with the processing program, online diagnosis is possible without limiting the diagnostic area or items.

As a result, it is possible to diagnose redundant shared devices without affecting general programs that execute input/output during business processing, simultaneously ensuring continuity of computer system operation and improved reliability based on preventive maintenance. It has the effect of being

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of a system according to an embodiment of the present invention, and Fig. 2 is a system conceptual diagram of an embodiment of the present invention.
Duplex diagnosis management table 14 in the input/output control device 3 shown in the figure
FIG. 3 is a conceptual diagram illustrating the contents of FIG.
3 is a flowchart for explaining an example of control processing. DESCRIPTION OF SYMBOLS 1...General program, 2...Diagnosis program for duplex shared device, 3...I/O control device, 4...
... Duplex shared input/output device, 11... Means for receiving input/output requests, 12... Means for determining/controlling input/output requests, 13.
... I/O request issuing means, 14... Duplex diagnosis management table, 15... I/O request waiting means, 16...
・Human output request restart means.

Claims (1)

[Scope of Claims] Comprising a duplex shared input/output device and an input/output control device that executes input/output requests to the duplex shared input/output device that are issued in competition from a diagnostic program and other general processing programs, If the input/output request is from a diagnostic program, this input/output control device registers the area to be input/output as the area under diagnosis in the redundant diagnosis management table, immediately issues this input/output request, and executes the input/output request. If the request is from a general program and it is not for the area under diagnosis, this input/output request is immediately issued, and when the input/output request is from a general program, it is for the area under diagnosis. A method for diagnosing a duplex shared input/output device, characterized by comprising an input/output request determination/control means that sometimes issues an input/output request after waiting for the area under diagnosis to be released by a diagnostic program.