JP2001350736A - Method and device for online processing and recording medium recording processing program therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technology capable of communication connection switching, with which online system stop is not recognized by an opposite system. SOLUTION: Concerning the online processing method for performing switching from an active online system to a reserve online system, this method has a step for suppressing transmitting from the active online system, step for temporarily suppressing receiving from the opposite system, step for switching communication with the opposite system from the active online system to the reserve online system, step for starting transmitting from the reserve online system, and step for canceling the suppression of receiving from the opposite system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an online processing system for switching from an active online system to a standby online system, and more particularly to an online processing system for improving the availability of a system when switching from an active online system to a standby online system. And effective technology.

[0002]

2. Description of the Related Art A conventional online processing system is provided with an active online system and a standby online system, and when a failure occurs in the active online system, the system is switched to a standby online system so that online processing can be continued. In addition, because the reliability of the online system has been improved, the online system is planned and operated, such as maintenance and inspection of the host computer and replacement of business programs, rather than when the active online system becomes a failure and switches to the standby online system. Switching is increasing.

In such switching from the active online system to the standby online system, the communication connection established between the active online system and the partner system is interrupted. Re-establish the communication connection between the two, check how far the business process has been performed before the switching between the business program of the standby online system and the business program of the partner system, and restart the business process after the switch There is a need.

[0004] After virtualizing a task to be taken over and forcibly purging the connection used by the failed system to make it a route to the standby host, the connection is re-established and high-speed switching from the active host to the standby host is performed. Japanese Patent Laid-Open No. 6-11080 discloses a dynamic path switching method for enabling hot standby such as n: 1 for a standby host.
No. 0 publication.

[0005]

In the conventional online processing system switching, a communication connection with a partner system must be reestablished to confirm how far the business processing has been performed, and then the business processing must be resumed. Therefore, there is a problem that the availability of the online processing system is reduced. In particular, due to the improvement in the reliability of the online system, the time required for stopping the current online system due to planned operations such as maintenance and inspection of the host computer and replacement of business programs has been relatively increased.

In the dynamic path switching method, as a technique for improving the availability of an online system configured to switch from an active online system to a standby online system, a communication connection is re-established as quickly as possible in the standby online system when the online system is switched. However, since the communication connection was interrupted, online operation could not be continuously performed for 24 hours.

Therefore, in order to further improve the availability of the online system, it is necessary to switch to the standby online system without interrupting the communication connection even when the active online system is stopped due to planned operation.

An object of the present invention is to solve the above-mentioned problem and to provide a technique capable of performing communication connection switching without causing the partner system to recognize that the online system has stopped.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an online processing system for switching from an active online system to a standby online system, wherein an online processing system switches from an active online system while maintaining a communication connection between a communication control device and a partner system. Switching to the standby online system is performed.

In the online processing system of the present invention, when switching from the active online system to the standby online system, first, transmission from the business processing of the active online system on the host computer is rejected, and reception by the business processing from the partner system is rejected. The communication controller temporarily rejects the communication and temporarily suppresses the communication performed by the communication connection established between the active online system and the partner system to create a non-communication state.

Next, while holding the communication connection between the communication control device and the partner system, the communication connection in which the communication is suppressed is taken over to the standby online system, and the suppression of the communication in the communication connection is released. Initiate communication between the standby online system and the partner system.

As described above, in the present invention, the communication connection is established by switching the host computer to the standby online system while maintaining the communication connection between the communication control device and the partner system in a non-communication state that is temporarily created. By switching without interruption, online is continuously operated for 24 hours by planned switching of online system. For this reason, the system can be switched from the active online system to the standby online system without interrupting communication with respect to a planned stoppage due to maintenance inspection of the host computer or software update.

As described above, according to the online processing system of the present invention, switching from the active online system to the standby online system is performed while maintaining the communication connection between the communication control device and the partner system. It is possible to perform communication connection switching without recognizing an online system stop.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An on-line processing system according to an embodiment for switching from an active online system to a standby online system will be described below.

FIG. 1 is a diagram showing a schematic configuration of an online system according to this embodiment. As shown in FIG. 1, the active online system 100 of the present embodiment includes a switching control unit 101
And a business process interface control unit 140. The switching control unit 101 switches the active online system 10 that switches communication with the partner system 400 from the active online system 100 to the standby online system 200.
This is the processing unit on the 0 side. Business processing interface control unit 1
A processing unit 40 suppresses transmission from the business processing unit 150 of the active online system 100 to the communication control device 300 in response to a request from the switching control unit 101. A program for causing the active online system 100 to function as the switching control unit 101 and the business process interface control unit 140 is recorded on a recording medium such as a CD-ROM, stored on a magnetic disk or the like, and then loaded into a memory and executed. Shall be. The recording medium for recording the program may be a recording medium other than the CD-ROM.

The standby online system 200 includes a switching control unit 201 and a business process interface control unit 240
And The switching control unit 201 is a processing unit of the standby online system 200 that switches communication with the partner system 400 from the active online system 100 to the standby online system 200. The business processing interface control unit 240 responds to the request from the switching control unit 201 by the business processing unit 250 of the standby online system 200.
Is a processing unit for starting transmission from the communication control device 300 to the communication control device 300. Switching control unit 2 for standby online system 200
01 and a program for functioning as the business processing interface control unit 240 are recorded on a recording medium such as a CD-ROM, stored on a magnetic disk or the like, and then loaded into a memory and executed. The recording medium for recording the program may be a recording medium other than the CD-ROM.

The communication control device 300 has a reception control unit 310. The reception control unit 310 suppresses reception of data transmitted from the business processing unit of the partner system 400 by the communication control device 300 in response to a request from the switching control unit 101 of the active online system 100, and switches the standby online system 200. This is a processing unit that releases the suppression of reception of data transmitted from the business processing unit of the partner system 400 by the communication control device 300 in response to a request from the control unit 201. A program for causing the communication control device 300 to function as the reception control unit 310 is recorded on a recording medium such as a CD-ROM, stored on a magnetic disk or the like, and then loaded into a memory and executed. The recording medium for recording the program may be a recording medium other than the CD-ROM.

As shown in FIG. 1, the online processing system of the present embodiment comprises a communication control device 30 for controlling communication with the active online system 100 and the partner system 400.
0, and a standby online system 200 that is on standby.

The active online system 100 includes a business processing unit 150 for performing business processing, and a business processing
Business processing interface control unit 140 for suppressing transmission from 0, a reception control unit 120 having reception information 122 and reception buffer 121, transmission information 112 and transmission buffer 111
, A communication control device interface control unit 130, and a switching control unit 101 for performing switching.

The standby online system 200 includes a business processing unit 250 for performing business processing, a business processing interface control unit 240 for starting transmission from a business, and transmission information 212.
Control section 210 having a transmission buffer 211 and reception control section 22 having reception information 222 and a reception buffer 221
0, a communication control device interface control unit 230, and a switching control unit 201 for performing switching.

The communication control unit 300 includes a host interface control unit 34 for controlling switching of the online system.
0, a reception control unit 310 having a reception buffer 311, a transmission control unit 320 having a transmission buffer 321, and a communication line interface control unit 330 for holding a connection.

FIG. 2 is a flowchart showing the processing procedure of the communication connection switching processing of the online system according to this embodiment. Upon receiving a communication connection switching request from the online system driver, the switching control unit 101 of the active online system 100 issues a transmission suppression request to the business processing unit 150 by the business processing interface control unit 140 (11).

Thereafter, the business processing interface control unit 14
0, the transmission control unit 110 checks the use status of the transmission buffer 111 to confirm that transmission by business processing has been suppressed, and confirms transmission suppression when the transmission buffer 111 is no longer used (12), and performs switching. Control is returned to the control unit 101.

Next, the switching control unit 101 issues a temporary reception rejection request to the communication control device 300 in order to suppress reception by business processing (13). Upon receiving the temporary reception rejection request, the reception control unit 310 of the communication control device 300 sends a temporary reception rejection (31) to the partner system 400 according to the data link level communication protocol, for example, HDLC (Hig).
h-level Data Link Control) RNR (Receive Not
Ready), the reception control unit 31 of the communication control device 300 rejects reception from the partner system 400.
Monitoring the transmission / reception buffer 311 and the transmission buffer 321 of “0”, and confirms the non-communication state in which all the received data is transferred to the active online system 100 and all the transmitted data is transferred to the partner system 400 (32).
Return control to 1.

The switching control unit 101 includes a reception control unit 120
Further, the reception buffer 121 is confirmed, and if it is confirmed that all the received data has been transferred to the business processing unit 150 and finally all the transactions of the business processing have stopped, the non-communication state has been established at this stage. .

When the switching control unit 101 of the active online system 100 confirms that there is no communication (14),
A request to take over a communication connection is made to the switching control unit 201 of the standby online system 200 (15). Transmission information 112 such as a transmission serial number and transmission window information defined by a network-level protocol managed by the transmission control unit 110 of the active online system 100;
By transferring the reception information 122 such as a reception serial number and reception window information defined by a network-level protocol managed by the reception control unit 120 to the switching control unit 201 of the standby online system 200 as takeover information, a communication connection is established. Takeover is possible.

The communication control device 300 is connected to the partner system 40
By setting the communication with the communication system 0 to the non-communication state, the communication connection can be held without notifying the partner system 400 of the disconnection of the communication connection due to the stop of the active online system 100. Switching can be performed by establishing a communication connection between the communication control device 200 and the communication control device 300.

The switching control unit 201 of the standby online system 200 that has received the request for taking over the communication connection,
The transmitted transmission information 112 and reception information 122 are transferred to the transmission control unit 210 and the reception control unit 220. The transmission control unit 210 converts the transmission information 112 into the transmission information 212, and the reception control unit 220 converts the reception information 122 into the reception information 222. Then, the communication connection is taken over (21), and the control is returned to the switching control unit 201.

The switching control unit 201 of the standby online system 200 includes the communication control device interface control unit 23
0, a communication connection is established with the communication control device 300, and a reception suppression release request is made (22).

Communication control device 3 which has received the reception rejection release request
The reception control unit 310 of 00 changes the transfer destination of the data to be received to the standby online system 200 (33), transmits a reception rejection release according to the protocol of the data link level (34), and executes, for example, RR (HRC procedure). Receive Rea
By transmitting dy), the reception from the partner system 400 is restarted. Thus, the received data after the restart is transferred to the standby online system 200.
Thus, the business process with the partner system 400 is suppressed, but the transfer to the standby online system 200 is completed without interruption of the communication connection.

Finally, in order to switch business processes,
The switching control unit 201 of the standby online system 200 issues a business takeover start request to the business processing unit 250 through the business processing interface control unit 240 (23).

In response to the business takeover start request, the business processing interface control unit 240 transfers necessary business information of the business processing unit 150 of the active online system 100 from the switching control unit 201 to the business processing unit 250, and is transferred. The business information is reflected in the business processing unit 250, whereby the business takeover is completed, and the business processing is restarted.

FIG. 3 is a diagram showing a flow of an operation for changing the software configuration without interrupting the communication by using the communication connection switching processing of the online system according to the present embodiment. First, the online system in operation (41) is stopped as a standby online system (4).
2) After the software is updated by adding a function of the business processing unit of the online system or taking measures against a defect (43), the operation is again started as the standby online system (44). In this state, it is operating as an active online system (40)
When the communication connection is switched from the online system (45), the standby online system starts operating as the active online system with updated software (46). The active online system that has switched the communication connection updates the software of the online system when it confirms the online stop (47) (48) and starts as a standby online system (49).
Then, the online system in which the software of both the active online system and the standby online system are updated will operate.

FIG. 4 is a diagram showing a flow of an operation for performing maintenance and inspection of the host computer without interrupting communication by using the communication connection switching processing of the online system according to the present embodiment. First, the online system that is operating (51) is stopped as a standby online system (5).
2) Then, maintenance and inspection (53) of the host computer are performed, and if there is no abnormality, the operation is started again as a standby online system (54). In this state, when the communication connection is switched (55) from the online system that is operating (50) as the current online system, the standby online system that has undergone maintenance and inspection starts operating as the current online system (56). After confirming the online stop (57), the active online system having switched the communication connection performs maintenance and inspection (58) of the host computer, and if there is no abnormality, starts as a standby online system (59). The online system for which both maintenance and inspection of the online system have been completed will operate.

FIG. 5 is a diagram showing an example of a management table for confirming that there are no transactions performing business processes in order to create a non-communication state at the time of switching in the present embodiment. The state of the transaction is managed for each task number, and when all the states are stopped, it is recognized that there is no transaction in the business process.

FIG. 6 is a diagram showing an example of system information for performing the switching of this embodiment. This is system information in the communication control device 300, and manages a destination route and a connection state on the host side and the partner side, respectively. When the online system is switched, the switching of the online system is controlled by changing the destination route information on the host side of the system information.

FIG. 7 is a diagram showing a transition of system information of the communication control device 300 at the time of switching according to the present embodiment. The system information (S1) on the host side when the active online system 100 is communicating with the partner system 400 via the communication control device 300 (S11) is as follows.

Destination route: active online system 100 Connection status: communicating This indicates that the partner communicating with the partner system 400 is the active online system 100, and the communication connection is in communication. The other party's system information (S2) is as follows.

Destination route: partner system 400 Connection state: communicating This indicates that the partner communicating with the active online system 100 is the partner system 400 and the communication connection is in communication.

The communication control apparatus 300, which has received the reception suppression request (S13) due to the planned switching start (S12) of the active online system 100, suppresses the connection state of the system information of the other party (S14), thereby setting the other party system 400 , And control is returned to the active online system 100.

The active online system 100 issues a switch request to the standby online system 200 (S16), and receives the standby request from the standby online system 200.
Then, the handover process of the active online system 100 (S
17) is performed.

The active online system 100 that has issued the switching request is stopped (S18), whereby the communication connection between the communication controller 300 and the active online system 100 is disconnected (S19). The system information (S3) on the host side at this time is as follows.

Destination Route: Active Online System 100 Connection Status: Stopped This indicates that the partner communicating with the partner system 400 is the active online system 100, and the communication connection is stopped. The other party's system information (S4) is as follows.

Destination route: partner system 400 Connection status: inhibited This indicates that the partner communicating with the active online system 100 is the partner system 400, and the communication connection is inhibited.

FIG. 8 is a diagram showing the continuation of the system information of the communication control device 300 at the time of switching according to the present embodiment. In the standby online system 200, the current online system 1
When the takeover from 00 is completed, start online (S2
0), and changes the destination route information to the standby online system 200 with the communication control device 300 (S21).
Then, the communication connection is started (S22). At this time, the host-side system information (S5) is as follows.

Destination route: standby online system 200 Connection state: communicating This indicates that the partner communicating with the partner system 400 is the standby online system 200, and the communication connection is in communication. The other party's system information (S6) is as follows.

Destination route: partner system 400 Connection status: inhibited This indicates that the partner communicating with the standby online system 200 is the partner system 400, and the communication connection is being inhibited.

The communication control device 300 releases the reception suppression (S23), and upon receiving the reception suppression release request, the communication control device 300 sets the connection state of the partner system information to the reception suppression release (S24). Then, a reception suppression release (S25) is transmitted to the partner system 400. The host-side system information (S7) at this time is as follows.

Destination route: standby online system 200 Connection state: communicating This indicates that the partner communicating with the partner system 400 is the standby online system 200, and the communication connection is in communication. The other party's system information (S8) is as follows.

Destination route: partner system 400 Connection state: communicating This indicates that the partner communicating with the standby online system 200 is the partner system 400, and the communication connection is communicating. As a result, the standby online system 200 restarts communication with the partner system 400 via the communication control device 300 (S26).

As described above, in the present embodiment, the host computer is switched to the standby online system 200 while maintaining the communication connection between the communication control device 300 and the partner system 400 in the non-communication state created temporarily. In this manner, the communication connection is switched without interruption, so that the online operation is performed continuously for 24 hours by planned switching of the online system. For this reason, for a planned stoppage due to maintenance and inspection of the host computer or updating of the software, it is possible to switch from the active online system 100 to the standby online system 200 without interrupting communication. Further, in the present embodiment, unlike the parallel system, a communication connection is established between a plurality of online systems and the communication control device 300, and a process of switching which online system is to be performed depending on a load state or the like is performed in communication. Since there is no need to perform this in the control device 300, the communication control device 3
In the case of 00, complicated control such as a parallel system need not be performed.

As described above, according to the online processing system of the present embodiment, switching from the active online system to the standby online system is performed while maintaining the communication connection between the communication control device and the partner system. It is possible to perform communication connection switching without causing the system to recognize the stop of the online system.

[0053]

According to the present invention, the switching from the active online system to the standby online system is performed while maintaining the communication connection between the communication control device and the partner system, so that the partner system does not recognize the stop of the online system. Connection switching can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of an online system according to an embodiment.

FIG. 2 is a flowchart illustrating a processing procedure of a communication connection switching process of the online system according to the embodiment.

FIG. 3 is a diagram showing a flow of an operation of changing a software configuration without interrupting communication using a communication connection switching process of the online system of the embodiment.

FIG. 4 is a diagram showing a flow of an operation of performing maintenance and inspection of a host computer without interrupting communication by using a communication connection switching process of the online system of the present embodiment.

FIG. 5 is a diagram illustrating an example of a management table for confirming that there are no transactions performing business processes in order to create a non-communication state at the time of switching according to the embodiment.

FIG. 6 is a diagram illustrating an example of system information for performing switching according to the embodiment;

FIG. 7 is a diagram showing a transition of system information of the communication control device 300 at the time of switching according to the embodiment.

FIG. 8 is a diagram illustrating a continuation of system information of the communication control device 300 at the time of switching according to the present embodiment.

[Explanation of symbols]

100: active online system, 110: transmission control unit, 111: transmission buffer, 112: transmission information, 120
... Reception control unit, 121 ... Reception buffer, 122 ... Reception information, 130 ... Communication control device interface control unit, 15
0: business processing unit, 200: standby online system, 2
10: transmission control unit, 211: transmission buffer, 212: transmission information, 220: reception control unit, 221: reception buffer,
222: reception information, 230: communication control device interface control unit, 250: business processing unit, 300: communication control device, 311: reception buffer, 320: transmission control unit, 32
DESCRIPTION OF SYMBOLS 1 ... Transmission buffer 330 ... Communication line interface control part 340 ... Host interface control part 400 ...
Partner system, 101: switch control unit, 140: business process interface control unit, 201: switch control unit, 24
0: business processing interface control unit, 310: reception control unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noriaki Takahashi 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Software Division, Hitachi, Ltd. Hitachi, Ltd. Software Division (72) Inventor Masahiko Tsuda 5030 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (Reference) 5B034 BB02 CC01 CC06 DD05 DD07 5B045 JJ24 JJ44 5B089 GA02 GA04 GB02 JA13 JB14 KA12 KB04 KC28 KG03 ME02

Claims (5)

[Claims] An online processing method for switching from an active online system to a standby online system, wherein a step of inhibiting transmission from the active online system, a step of temporarily inhibiting reception from the partner system, An online processing method comprising: a step of switching communication with an active online system to a standby online system; a step of starting transmission from the standby online system; and a step of canceling suppression of reception from a partner system. 2. The online processing method according to claim 1, wherein said standby online system is an online system in which updated software is executed. 3. The online processing method according to claim 1, wherein the standby online system is an online system that has undergone maintenance and inspection. 4. An online processing system for switching from an active online system to a standby online system, comprising: a business processing interface control unit for suppressing transmission from the active online system or starting transmission from the standby online system; An online processing system, comprising: a reception control unit that suppresses or cancels reception from a communication system; and a switching control unit that switches communication with a partner system from an active online system to a standby online system. 5. A computer-readable recording medium in which a program for causing a computer to function as an online processing system for switching from an active online system to a standby online system is provided. A business processing interface control unit for starting transmission from the system, a reception control unit for suppressing or canceling reception from the partner system, and a switching control unit for switching communication with the partner system from the active online system to the standby online system A recording medium on which a program for causing a computer to function is recorded.