JPH08286993A - Sampling method for line fault analysis information - Google Patents

Abstract

PURPOSE: To secure information capable of being investigated and to improve a maintenance function by saving internal trace information being sampled as wrapping around in the area of a communication control program to the area of each line at the time the detection of a fault after the establishment of a data link. CONSTITUTION: Whether a saving number 204 obtained by calculating the amount of trance information capable of investigating all retry states exceeds a remaining saving number 205 or not is judged, and in the case where it exceeds, the area number 205 of the maximum saving number is put in to the saving number 204. After that, in conformity to the saving number 204, saving processing from an internal trace area 9 to a trace saving area 20 is executed by starting from the final internal trace information. Then, the area number 205 is updated by subtracting the contents of the area number 205 by the saving number 204, and the saving processing is finished. Thus, the effective internal trace information till the detection of the fault can be saved from a bottom part trace area 9 where it is being sampled as wrapping around to the trace saving area 20, and the analysis information at the time of the occurrence of the fault can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of collecting line failure analysis information in a communication control processing program for controlling input / output of a line in data transfer with a terminal / partner system connected to a communication line, and particularly online. The present invention relates to a method of collecting line failure analysis information for accurately securing information for investigating the cause of an accidental line failure even when the trace function is not operating during system operation.

[0002]

2. Description of the Related Art When investigating a fault detected by a communication control processing program, the fault code or the like generated at the time of fault detection is being investigated. However, if it is necessary to investigate the flow up to the occurrence of the fault, trace again. The function was operated and the data was collected. Further, when the load cannot be applied during the operation of the online system, the input / output information of the line is collected in the area in the communication control processing program and the area is displayed to obtain the investigation information. As a method of this kind, for example, as disclosed in Japanese Patent Laid-Open No. 4-181335, an identifier that can determine normal / abnormal is set in the trace data during system operation, and necessary information is determined and stored on the host side. Therefore, there is a method of reducing the load on the online system.

[0003]

By the way, in the case where an accidental line failure has already occurred during the operation of the online system using the above-described conventional trace collection method, the following problems will occur.

1. In the online system where the trace function is not always operated, when the information on the flow of communication is needed, it is necessary to operate the trace function and monitor until the failure reoccurs, which requires a long investigation time.

[0005] 2. While the online system is in operation, the trace function, which requires overhead, is not used and the information is stored using the area in the communication control processing program. However, if the same line is used again due to line restoration, the stored information will wrap around. It was impossible to investigate.

An object of the present invention is to provide internal trace information collected while wrapping around in the area of the communication control processing program, even if the trace function is not operating in the communication control processing program, to a failure after the data link is established. At the time of detection, it is to save the information that can be investigated by saving in the area for each line and improve the maintenance function.

[0007]

In order to solve the above problems, in the line failure analysis information collecting method of the present invention, internal trace information collected while wrapping around in a communication control processing program is used as a failure after a data link is established. Only when it occurs, save to the save area for each line. This information is transferred to the host for analysis at the request of the host, but the information is not written again in the save area until the information is transferred in response to this area information transfer request. This state continues until the inhibition state is released during information transfer.

With these functions, it is possible to operate the trace function, which requires a heavy load during the operation of the online system,
A method of collecting line failure analysis information, which enables investigation of accidental line failures by leaving information that can be analyzed.

[0009]

In the method of collecting line failure analysis information according to the present invention, the information accumulated in the internal trace area of the communication control processing program for each line event is wrapped in the save area for each line when a line failure is detected. When the save area is full, it is saved before the information is lost, and when the save area is full, the write-inhibited state is set in order to prevent damage due to the save of the information when the next failure is detected. Then, according to the display request from the host, the saved information is transferred to the host and can be obtained as a troubleshooting information. When the information is transferred to the host, the save suppression state of the save area is released to prepare for the information save at the next failure occurrence.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 4 is a system configuration diagram of the present invention. In FIG. 4, 1 is a host computer, 2 is a communication control processing device, and 8 is a console control device. The communication control processing program 3 realizes a communication function with the communication management program 4 operating in the host computer 1, and efficiently transfers data with the terminal / partner system 7 via the online program 5 of the host computer 1 and the communication line 6. To do.

Further, the communication control processing program 3 manages a state for each line and an internal trace area 9 for accumulating line input / output information with the terminal / partner system, request completion information, etc. each time an event occurs. The line control table 10 and the trace save area 20 for each line in which internal trace information is saved when a line failure is detected are secured.

FIG. 2 is a diagram showing an outline of an internal trace collection method during normal transmission / reception with a terminal / partner system.

FIG. 3 is a diagram showing an outline of saving internal trace information when a line fault is detected during transmission / reception with the terminal / partner system of the present invention.

FIG. 1 is a diagram showing a schematic processing flow of the analysis information collecting method of the present invention, and FIG. 5 is a schematic diagram of transferring the saved analysis information to the communication management program 4 of the host computer 1.

A method of realizing the present invention will be described below with reference to FIGS.

In FIG. 2, the communication control processing program 3
Performs the input / output operation of the line for data transfer with the terminal / partner system 7. The request and the completion event are accumulated as internal trace information according to the contents of the sequential write pointer 902. In addition, this area is the final pointer 9
When the number reaches 03, the head pointer 901 is set to the write pointer 902, and the latest internal trace information is accumulated while wrapping around. If an operation request for the trace function is issued from the communication management program 4, the trace information is transferred to the communication management program 4 and accumulated when the area wraps around. However, if the trace function is not in operation, it wraps around and the information is lost. Thus, if the input / output is normally repeated, the latest information is always accumulated while wrapping around (330).

In FIG. 3, when a failure occurs in the input / output to / from the line during normal transmission / reception and the recovery cannot be recovered by the retry processing of the communication control processing program 3 (331), the line failure processing is performed simultaneously with the line failure processing. The information in the internal trace area 9 is saved (332) in the trace save area 20 of FIG. Save this internal trace information
Schematic processing flow will be described with reference to the system configuration diagrams of FIGS. 1 and 4.

When a line failure is detected, the internal trace information is not unconditionally saved, and it is judged whether or not an accidental failure is expected after the data link has been established (301), and the data link is established again for easy data collection. If it is a time obstacle, the evacuation is not performed. If it is a failure during transmission / reception after the data link is established, it is saved in the trace save area 20 for each line, but it is judged whether the remaining save area number 205 of the trace save area 20 is 0 (302). If it is 0, it is full and the evacuation is not performed. If it is not full and there is no same analysis information in the failure detection factor code of the collected analysis information (30
3), the amount of evacuation from the internal trace area 9 is calculated from the number of retries in the line control table 10, and the amount of trace information that can be investigated for all retry conditions is calculated (30
4) Set the number of evacuation to 204.

Number of saves = number of retries x 2 (request / completion)
x2 (to grasp the situation before the line failure) Next, it is determined whether the calculated number of saves 204 exceeds the number of remaining save areas 205 (3
05), if it exceeds, the number of remaining save areas 205, which is the maximum possible number of saves, is entered in the number of saves 204 (306). After that, according to the value of the save count 204, save processing is performed from the final internal trace information to the trace save area 20 from the internal trace area 9 (307), and the content of the remaining save area count 205 is subtracted by the save count 204. , Number of remaining save areas 205
Is updated (308), and the save processing ends. In this way, the effective internal trace information up to the detection of the failure is saved from the internal trace area 9 that is collected while wrapping around to the trace save area 20 to secure the analysis information when the line failure occurs.

FIG. 5 shows an outline of the flow of collecting the saved information.

From the console control unit 8, the analysis information display command is input together with the line name for which the analysis information is desired to be obtained. This request is passed to the communication management program 4, and a request for displaying analysis information is sent to the communication control program 3 (4
01). As a result, the communication control processing program 3 searches for the corresponding trace save area of the requested line number and prepares for display (310). Next, it is determined whether the analysis information has been saved (311). If the analysis information has not been saved, a response message without analysis information is prepared (31).
6), it responds as a display processing result of the analysis information (31
5). If the analysis information has been saved, the saved information is prepared for display (312), the remaining save area number 205 is initialized with the maximum registration number 206 (313), and the write pointer 201 is also initialized with the head pointer 203. (31
4). Then, it responds to the communication management program 4 as a display processing result of the analysis information (315). The communication management program 4 displays the analysis information which is a response from the communication control program 3 or a message without the analysis information on the console control device 8 (402). This console display information,
At the end of online work, a memory dump in the communication control processing unit is collected, and the cause is investigated by the contents of the saved area in the saved communication control processing program.

[0023]

According to the present invention, even when the trace function is not operated during the operation of the online system, the trace function is activated again when the flow needs to be investigated due to an accidental line failure. Therefore, it is possible to obtain the investigation materials without monitoring the recurrence, and it is possible to shorten the time until the cause is determined.

[Brief description of drawings]

FIG. 1 is a schematic process flow chart showing a method of collecting analysis information.

FIG. 2 is a diagram showing an outline of internal trace collection during normal communication.

FIG. 3 is a diagram showing an outline of saving internal traces as analysis information when a failure is detected.

FIG. 4 is a diagram showing a system configuration of the present invention.

FIG. 5 is a diagram showing an outline of a method of obtaining information on save information.

[Explanation of symbols]

1 ... Host computer, 2 ... Communication control processing device,
3 ... communication management processing program, 4 ... communication management program, 5 ... online program, 6 ... communication line, 7 ...
Terminal / partner system, 8 ... Console control device, 9
... internal trace acquisition area, 10 ... line control table, 20 ... save area.

Claims (1)

[Claims] 1. A communication control processing program operating on a communication control processing apparatus, wherein input / output information to and from a line is accumulated in a trace area in the program, and if the trace function is operating, the host area is stored when the trace area is full. If the trace function is not operating when the line failure is detected, in the method that accumulates the information in the external storage device and updates and accumulates the information in the area while wrapping around the information in the area if the trace function is not operating. The line failure is characterized in that the minimum required amount of information is calculated from the value set in the configuration definition only during transmission / reception after the data link is established, and after saving the information, the information is retained until the information is referenced. How to collect analysis information.