JP3483901B2 - Method of changing system configuration and computer system for implementing the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for changing the configuration of a data processing system, and more particularly to a data processing which can reduce the switching time between the system before the configuration change and the system after the configuration change in an online system that continuously operates for a long time. Regarding the system configuration change method.

[0002]

2. Description of the Related Art A conventional technique is disclosed in Japanese Patent Laid-Open No. 62-2575.
As described in Japanese Patent Publication No. 40, when the system configuration is changed such as addition or deletion of resources during the operation of the data processing system, by recording the history information,
There is a technique of making it possible to recover the information of the system configuration to the changed configuration at the time of stopping the system when the system stops.

Further, as described in Japanese Patent Application Laid-Open No. 62-248037, a technique is provided in which a production system and a backup system are provided, and when a failure occurs in the production system, the backup system is used to continue the processing. There is.

[0004]

In the above prior art, a spare system is provided, and when a failure occurs in the production system, it is not considered to switch to the spare system. There is a problem that the process is interrupted until the failure of the production system is recovered and the system is restarted.

In the other prior arts described above, the production system and the standby system must have the same configuration and the same program as the production system and the standby system, and this is also a condition that can be immediately switched. There is a problem that the hot standby function cannot be used when the configuration information cannot be changed and the configuration information is changed.

An object of the present invention is to reduce the switching time to about the hot standby switching time when the system is switched with a configuration change, and when a failure occurs in the production system during the preparation for switching, the standby system is used. Accordingly, it is to provide a configuration change method of a data processing system capable of continuing processing.

[0007]

In order to achieve the above object, in a data processing system including a production system and a standby system, another system is provided, and the system instructed to start is changed. System configuration information is loaded, initial setting processing is performed, business restart instructions are waited for, and when the production system receives a business restart instruction after a planned stoppage, a catch-up processing for business restart is performed. Is to restart.

[0008]

Function: The system after the configuration change is started up on a host other than the host that is executing the work. The system after the configuration change uses the already changed system configuration information, and the initial setting process ( Since the initialization process has already been performed, the stop time at the time of changing the configuration can be greatly reduced.

In addition, if the production system fails after the system is temporarily stopped after the configuration change and before the production system finishes the stop process for the configuration change, the hot standby switching process is executed. The system allows processing to continue.

[0010]

An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of the configuration of a data processing system according to the present invention. Program file 1 in which a business program and an online control program exist on the host H1
1. System configuration information file 1 that stores configuration information
2, journal file 13, system management file 1
4. An inter-host communication device 15 for hot standby is connected. The inter-host communication device 15 connects the host H2 and the host H3. The system configuration information file 12 contains the configuration information that has already been executed and the configuration information that has been changed, and can be distinguished by keywords or the like. System management file 1
Reference numeral 4 stores terminal information and the like added during business execution, and also stores information indicating a stop mode type such as normal termination, abnormal termination, or suspension for configuration change during online suspension. Each host H1, H2, H3 has an online control program 21 for controlling transactions, a business program 22 for transaction processing, and a hot standby control program 23 for improving the reliability of the online programs, which are loaded from program files and reside in memory. To do.

FIG. 2 is a control flow of the data processing system according to the present invention. On a host other than the host that is executing the business, the operator gives an instruction to start the business execution system that has undergone a configuration change such as an increase in terminals or the addition of business programs. The activated system loads transaction control programs and business programs,
Load system configuration information. After that, it allocates files for execution, secures memory, initializes the table buffer, and waits for an instruction to restart the job. The system that was executing at that time suppresses the execution of the next transaction, concludes the transaction in progress, and stops it. At that time, the transaction completion status is written in the journal file and the stop mode type is written in the system management file. After the stop processing is completed, an instruction to restart the work is given, and the catch-up processing for restarting the work is performed online after the configuration change to restart the work. In the catch-up processing, it is determined whether or not the business can be continued based on the stop mode type in the system management file and the changed system configuration information that has already been loaded. If it is possible to continue, the history information in the system management file generated during execution is merged with the changed configuration information, and the transaction status is recognized from the journal file. After performing this series of processes, if there is a standby machine, the standby machine is automatically terminated.

The standby machine has a role of performing hot standby when the system fails during business execution, and also when the business execution system after the configuration change has failed while waiting for restarting. Correspond.

After the hot standby control program issues a job restart instruction to the online after the configuration change, the standby online after the configuration change can be activated. The start instruction can be issued by an operator or automatically started by the hot standby control program.

According to this embodiment, since the online processing after the configuration change is completed before the restart of the business, the switching time is greatly shortened.

[0016]

According to the present invention, the time for changing the system configuration of an online system having a hot standby configuration can be significantly shortened, and when a failure occurs in the production system during preparation for switching, processing is performed by a standby system. It has the effect of being able to continue.

[0017]

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing procedure of a configuration change switching process.

[Explanation of symbols]

H1 ... Host 1, H2 ... Host 2, H3 ... Host 3 11 ... Program file, 12 ... System configuration information file, 13 ... Journal file, 14 ... system management file, 15 ... Inter-host communication device, 21 ... Online control program, 22 ... Business program, 23 ... Hot standby control program.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Murakawa 5030 Totsuka-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Software Development Division, Hitachi, Ltd. (56) Reference JP-A-4-24732 (JP, A) Flat 4-186467 (JP, A) JP-A-3-12773 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G06F 11/20 G06F 15/00

Claims (2)

(57) [Claims] 1. A first computer executes a business program, and a second computer responds to a start instruction of a business program whose configuration has been changed in the second computer, and changes the configuration. The system configuration information generated based on the above is held, and after the resources for executing the business program whose configuration has been changed are secured, a preparation completion instruction is sent to the first computer, and the first computer is the When a preparation end instruction is input, the execution of unexecuted transactions in the business program is suppressed , the in-progress transaction is settled, and the business program is stopped by holding the settled state and the stop mode type of the transaction. and it transmits an instruction for resuming business to the second computer, the second computer, in response to an input of an instruction of the operations resuming
Te, the transaction settlement conditions, system configuration, characterized in that to start the execution of the service program in which the configuration has changed after performing the stop mode type and the generated system configuration information to follow based on the arrived processing Modification method. 2. A meter provided with a first computer and a second computer.
In calculation system, the first computer executes a service program, the second computer, in response to input of a start instruction of the business programs constituting the second computer is changed, the changes of the configuration Storing system configuration information generated based on the above, and sending a preparation end instruction to the first computer after securing resources for executing the business program whose configuration has been changed, wherein the first computer is Further, when the preparation end instruction is input, execution of an unexecuted transaction in the business program is suppressed , a transaction in process is settled, and the business transaction is performed by holding the finalized state and the stop mode type of the transaction. Stop the program,
Sends an instruction operations resume the second computer, the second computer is further in response to input instructions of the business resumption, the stop mode type and the generated system configuration and settled state of the transaction computer system, characterized in that to start the execution of the service program in which the configuration has changed after the chase arrived process based on the information.