JPS6031661A - Fallback operation system of application program - Google Patents

Abstract

PURPOSE:To execute an another task in an application program by forming a temporary data set when the application program fails the allocation processing of a certain data set or its open processing. CONSTITUTION:Prior to the execution of tasks 8-A, 8-B, 8-C, a task 8-D requests the opening of resources A, B, C to a resource open processing mechanism 2. If the opening of the resource C is failed, the application program 1 is abnormally ended. In order to operate the fallback of the application program, a temporary resource X is formed in stead of the resource C in question at first. To form the temporary resource X, an operator inputs the variable resister serial number of the variable resister 7-X for forming the temporary source X, the name of a skimmer 9 defining the the resouce C in question and SWITCH(DS) command designating the name of the resouce C in question from a console 5. After the preparation and registration processing of the resource X is carried, the operator executes the application program 1 again.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides that when an application program fails in allocation processing or open processing of a data set due to a hardware failure or a media failure, the application program is configured to perform processing on the abnormal data set. The present invention relates to a fallback operation method for an application program in which an alternative temporary data set is generated and the application program falls back using the temporary data set.

[Conventional technology and problems]

Conventionally, when an application program encounters a hardware (channel, device, etc.) failure or medium failure during allocation processing or open processing, it terminates abnormally, regardless of the presence or absence of other normal data sets, and the application program All processes related to the failure could not be started until the cause of the failure had been investigated and recovery completed. As a result, even processes unrelated to the failure data set became victims.

[Purpose of the invention]

The present invention is based on the above considerations, and even if an application program that executes multiple processes fails to open some datasets and some processes become impossible, other processes can still be executed. The purpose is to provide a fallback operation method for application programs that have become expensive.

[Structure of the invention]

Therefore, in the fall pack operation method of the application program of the present invention, if the allocation process or the open process of the data set of the application program fails,
The present invention is characterized in that a temporary data set is created, and allocation processing or open processing for designating the abnormal data set is performed on the temporary data set.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a diagram explaining the resource creation processing mechanism-2, FIG. 3 is a diagram explaining the resource creation and registration processing mechanism, and FIG. 4 is a diagram explaining the access management mechanism. Figures 5 and 6 are diagrams for explaining the recovery and installation of problem resources. Figure 7 is an operating procedure for operating the application program Y fallback and an operating procedure for normal operation. This is to explain.

In FIG. 1, 1 is an application program, 2 is a resource creation processing mechanism, and 3 is a temporary resource creation and registration processing mechanism.

4 beam recovery processing mechanism, 5 console, 6 access pipe embedding mechanism, 7-A to 7-X resources (data set)
8-A to 8-D are tasks,
9 shows each schema and tail. Multiple,■,■・・
・ indicates the order of processing. Application program 1 includes tasks 8-A to 8-D'Y. 8-D is for opening funds AA, B, and C. Establishment processing means allocation processing and open processing.

Therefore, task 8-A is used for resource A', task 8-B is used for resource Bi, and task 8-C is used for resource A'.
is resource intensive. Task 8-A, 8-B
, 8-C(7) can be executed independently of each other. The resource opening processing mechanism 2 uses the application program 1 and resources? It creates an environment in which the application program 1 can access resources, and as shown in Figure 2, it performs the data set resource allocation process defined in the schema 9 used by the application program 1. If a temporary resource is registered in the schema 9, the above process is performed on that resource. As shown in FIG. 3, the temporary title creation registration processing mechanism 3 executes the 5WITCH[DS] command,
A low credit resource Z to replace the defined resource of the specified schema 9 is dynamically created on the specified volume, and its volume serial number is stored (registered) in the schema 9.

The recovery process 8114 is to repair the data set that has become abnormal. As shown in FIG. 4, the access management mechanism 6 checks whether the data set resource can be accessed (READ/WRITE) from the VC and the application program 1 by referring to the key map 9, and if temporary access is registered. In this case, the input/output request is linked to the application program as an error (input/output failure). The schema 9 is a definition body that defines the data set resources (data set name, volume serial number, etc.) used in the 5 group program 1. The schema 9 is referenced at the time of data set creation and input/output requests (READ/WRITE) at the request of the application program (1).

The volume serial number of the temporary resource is 5WITCH [DS]
It is registered in the schema 9 by the command.

1: Prior to executing Xri 8-A, 8-B, 8-Cco,
Task 8-D requests the resource establishment processing mechanism 2 to establish resources A, B, and C. Now, if it is assumed that the creation of resource C fails, the application program 1 will terminate abnormally. In order to perform fallback operation of the application program, first the problem resource C
Create a temporary resource to replace it. To create a temporary resource (DS) Input from the command console 5.The volume 7-X for creating the temporary resource X is the volume 7-X where the problem resource C exists.
Specify something other than C. When this swITCH(DS) command is input, the temporary resource creation registration processing mechanism 3
Perform the following processing.

0 Create temporary resource X on the specified volume 7-X.

Volume 7-XO) Register volume serial number on schema 9 where temporary resource X was created.

○ Prohibit access to problem resources.

As the temporary resource X, a data set with the following attributes is created.

○ Data set name same as the problem resource O Data set organization Sequential organization data set ○ Record format No KEY, fixed length record 0 Block length Same as the problem resource ○ Space amount After performing the creation and registration process of temporary resource X, the operator - 5
Program for 1y! 'Rerun. Under the state in which the creation and registration process for temporary resource X has been performed, the allocation process and open process for resource C at the time of starting the application program are performed for temporary resource X, and the apparent opening is successful. rl=, that data set is blocked when the temporary resource is created, so it is never actually accessed. The access request to problem resource C from application program 1 is as follows:
Notified as an input/output error.

FIGS. 5 and 6 are diagrams for explaining the recovery and installation of problem resource C. Problem resource pasting and embedded processing are
This is done in one of the following ways: Temporary resources that are no longer needed are automatically deleted. 0 Extent swap-recovery with the same volume as the problem resource as the recovery destination Also, if the problem resource failure is not a media failure and there is no need for recovery. So, as a method to do only the embedding.

Installation using the OPERMIT[DB1 command will be explained.

FIG. 5 is a diagram illustrating extent swap recovery in which the recovery destination is a volume 7-C/ having the same volume serial number as the problem resource C. If there is no job that is allocating the volume of problem resource C, create a new volume 7-C'Y with the same polym serial number as problem resource C, specify that volume as the recovery destination, and perform extent swapping. Do recovery.

Figure 6 is a diagram explaining installation using the PERMIT (DB) command.
W) The PERMIT [DB] command can be used to switch the application program allocation destination Y from temporary resource X to problem resource C. Temporary resource X is erased by executing the command.

FIG. 7 explains the operating procedure for operating the application program in fallback mode and the operating procedure for operating it in normal operation. Note that MT is a magnetic tape that stores all dump data and log data. ■ in Figure 7
, . . . correspond to those in FIG.

(Resource Allocation processing or organic processing for resource C failed.

■ 5WITCH [Input DS1 command to create temporary cost source X on volume 7-X.

■ Application program 1'lk: Restart. At this time, allocation processing or oven processing is performed on the temporary resources.

■ Perform fallback operations for application programs.

■ Extents - Performs swap recovery to recover and incorporate data sets.

■ Operate the application program normally.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, even if a fault occurs in some data sets when executing an application program using a plurality of data sets, the faulty data set y cannot be used. can perform other tasks in the application program.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a diagram explaining the resource creation processing mechanism 2, FIG. 3 is a diagram explaining the resource creation and registration processing mechanism, and FIG. 4 is a diagram explaining the access management mechanism. Figures 5 and 6 are diagrams for explaining recovery and installation of problem resources. Figure 7 is an operating procedure for fallback operation of an application program and an operation procedure for normal operation. This is to explain. 1... Application program, 2... Resource creation processing mechanism,
3...Temporary resource creation registration processing mechanism, 4...Recovery processing mechanism, 5...Bonsall, 6...Access management machine jL7-A 7-X...Resource (data set)?
Storage volume, 8-Atx L8-D...Task, 9...Schema. Patent Applicant: Fujitsu Limited Representative Patent Attorney Kyotani

Claims (1)

[Claims] If the allocation process or open process of the data set that the application program consists of fails, create a temporary data set y and add the abnormal data set to the allocation process or process 11' for the above temporary data set. A fallback operation method for application programs that is characterized by the following features: