JPH03271832A - Data equivalent system for duplexing system - Google Patents

Abstract

PURPOSE:To surely execute the data equivalent processing by sharing the equivalent processing contents with packet data in advance before transferring changing data between an operating system device and a stand-by system device. CONSTITUTION:A stand-by system packet generating part 10 generates a response packet, when an equivalent processing requiring packet is received through a transmission line from an operating system. The generated response packet is transmitted to the operating system through the transmission line 8. Simultaneously, the stand-by system packet generating part 10 informs a stand-by system device main body part 9 of an equivalent processing requirement by an equivalent processing signal line 11. The stand-by system device main body part 9 of the end of this equivalent processing requirement is informed from the stand-by system packet generating part 10 by an end signal line 1 12. In such a manner, even in the case plural changes are generated simultaneous ly in the operating system, unchanged data is detected easily, and the processing at the time when abnormality is generated is executed surely.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for processing data by inheriting normal data from the active device when a failure occurs during processing in the active device. This paper relates to a data equivalence method for a redundant system that restarts operations.

[Conventional technology]

Traditionally, redundant systems have been designed to provide support in the event of a failure (tsutsukup) in order to improve the reliability of data communication systems.
In consideration of this, two systems of central processing units, an active system and a standby system, are prepared.

During normal times, the standby system is separated from the communication system and assigned to handle offline work, and if the active system becomes unusable due to some kind of failure, the standby system takes over the data from the active system and performs processing.

For example, FIG. 7 is a system block diagram showing a data change method of a conventional duplex system disclosed in Japanese Patent Application Laid-Open No. 63-228338.

As shown in FIG.
1) and a change data information transmitter (22) are connected by an address line (23), a data line (24), a write signal line (25), and a change notification instruction signal line (26).

In addition, in the standby system, the standby system device main unit (29) and the change data information receiving unit (30) are connected to an address line (31), a data line (32), a write signal line (33), and a bus hold request signal. line (34) and bus hold response signal line (35)
connected with.

The active system and the standby system are connected by a transmission path (28).

Next, the operation of the conventional example will be explained.

First, if the active system cannot process due to some kind of failure, as shown in Figure 7, the main unit of the active system (21)
sends a write signal to the changed data information transmitter (22) via the write signal line (25), and then sends the write signal to the address line (23).
) and a data line (24), and a change notification is transmitted through a change notification instruction signal line (26).

Next, the changed data information transmitter (22) creates packet data consisting of two pieces of address information and changed data information, and transmits the packet data to the standby changed data information receiver (30) via the transmission path (28). serially transmitted to.

Then, in the standby system change data information receiving section (30),
After obtaining the address information and data value of the change data from the received packet data, the standby device main unit (29) changes the memory data in the standby device main unit (29).
A bus hold request is issued via the bus hold request signal line (34).

Therefore, the change data information receiving unit (3
0), the modified data information receiving unit (30) transfers the address line (31
), a data line (32), and a write signal line (33), respectively, to send the address information, data value, and write signal of the changed data to the standby device main unit (29).

Then, the standby device main unit (29) rewrites its own memory content with the changed data content sent from the active system.

In this way, in the data modification method of conventional redundant systems, by performing data equivalency processing from the active system to the standby system, the standby system can take over the processing that was being performed on the active system as it is. .

[Problem to be solved by the invention]

As mentioned above, in the data change method of conventional redundant systems, changed data information is serially transmitted from the active system to the standby system, so if multiple change processes occur simultaneously on the active system, the standby system In this case, it was not possible to recognize that multiple changes had occurred. For this reason, for example, when a failure occurs in the active system and the standby system takes over processing, there is a problem that a difference occurs between the changed data on the active system and the changed data on the standby system.

Furthermore, since conventionally there is only one transmission line connecting the active system and the standby system, there is a problem in that the conventional system cannot mutually monitor the status of other systems.

This invention was made with the aim of solving the above-mentioned problems. It prevents differences in changed data between the active system and the standby system, and also prevents the difference between the active system and the standby system. The purpose of this invention is to provide a data equivalence method for a duplex system that allows mutual status monitoring.

[Means for Solving the Problems] In the data equivalence method of the duplex system according to the present invention, the operational device divides the changed data to be transferred and performs an equivalency process in which packet data consisting of flags corresponding to each changed data is processed as a processing request. Create processing request packet data, send the equivalent processing request packet data from the active device to the standby device, monitor the response from the standby device, and confirm reception when the standby device receives the equivalent processing request packet data. The standby device generates a response packet and sends it to the active device, and the standby device performs equalization processing on each changed data sent from the active device, and generates an equivalent processing result consisting of a flag corresponding to the processed notification of each changed data. Create packet data, send the equivalently processed packet data from the standby device to the active device, monitor the response from the active device, and confirm the reception when the active device receives the equivalently processed packet data. The feature is that a response packet is created and sent to the standby system device.

[Effect]

The data equalization method of the duplex system according to the present invention is such that when the active system fails, control packet data is exchanged between the active system and the standby system prior to data transfer to be taken over to the standby system. Transmission takes place. This results in
Even if a plurality of change processes occur almost simultaneously on the active system, it is possible for the standby system to recognize all the equivalent processes in advance.

Further, by mutually monitoring reception confirmation of control packet data, it is possible to determine which equivalent process has become abnormal.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a data equalization method for a duplex system according to the present invention will be described below based on the drawings.

FIG. 1 is a system block diagram showing one embodiment of the present invention.

Here, the experiment was carried out using an active system device and a standby system device of a duplex system as shown in FIG.

As shown in FIG. 1, the active system includes an active device main unit (1) and an active packet generator (2), both of which are connected to an equivalent processing signal line (3), an end signal line 1 ( 4), abnormality notification line (5), equivalent processed signal line (6), and termination signal line 2
(7) is connected.

The equivalent processing signal line (3) is connected to the main unit of the operational system (1).
The generation of equivalent processing requests from the active packet creation unit (2
).

The end signal line 1 (4) is a line that conveys the end of the equalization processing request.

The active packet creation unit (2) creates packet data corresponding to the equalization processing request from the equalization processing signal line (3), monitors the response from the standby system, and processes the equalization processed packet data from the standby system. A response packet is created, etc.

The abnormality notification line (5) is a line that notifies the main unit (1) of the active system that a response packet cannot be received from the standby system.

The equivalently processed signal line (6) is a line that transmits the equivalently processed signal from the standby system to the main unit (1) of the active system.

The end signal line 2 (7) is a line that conveys the end of the equivalently processed signal from the standby system.

In addition, the standby system includes a standby system device main unit (9) and a standby system packet creation unit (10), and both of them are connected to an equivalent processing signal line (11), an end signal line 1 (12), and an abnormality notification line ( 13
), equivalently processed signal line (14) and termination signal line 2 (1
5) is connected.

The equivalent processing signal line (11) is a line that transmits the occurrence of an equivalent processing request from the active system to the standby system main unit (9).

The termination signal line 1 (12) is a line that conveys the termination of the equalization processing request.

The equivalently processed signal line (14) is connected to the standby device main body (
The equivalently processed signal from 9) is sent to the standby packet generator (1
0).

The standby packet creation unit (10) creates packet data corresponding to the equalization processing notification on the equalization processing completed signal line (14), monitors the response from the active system, and processes the equalization processing request packet data from the active system. A response packet is created, etc.

The abnormality notification line (13) is a line that notifies the standby system main unit (9) that a response packet cannot be received from the active system.

The termination signal line 2 (15) is connected to the standby device main body (9).
This line conveys the end of the equivalently processed signal from.

Next, the operation of this embodiment will be explained below.

FIG. 2 is a configuration diagram of packet data used in an embodiment of the present invention.

Here, packet data (1
6), control packet data is transmitted.

Bit 0 and bit 1 of packet data (16) in Figure 2
indicates the meaning (function) of the packet, and in this embodiment, the equivalent processing request is rOJ, and the equivalent processing request response is "
1", the equalization processed notification is "2", and the equalization processed response is "3".
” is indicated.

Next, from bit 1 to bit n, equivalent processing 1 flag to equivalent processing n- correspond to the divided equivalent processing, respectively.
1 flag.

However, when the values indicated by the above functions are equal processing request response "1" and equal processing completed response "3", the packet data is composed of only the function.

Also, when the value of the function is equal processing request "0", the corresponding processing flag is turned ON, and the equal processing completed notification "2" is set.
”, the corresponding processing flag is turned OFF.

Therefore, the processing when an equivalent process is requested in the active packet creation section will be explained using the flowchart of FIG. 3 and FIG. 1.

First, an equivalent processing request generated in the active device main unit (1) shown in Figure 1 is transmitted to the active packet generator (2) via the equivalent processing signal line (3), and the request is sent to the active packet generator (2) based on the data. Bucket data as shown in FIG. 2 is created (step 100 in FIG. 3). At this time, the equivalent processing signal line (
The end of the information from 3) is notified through the end signal line 1 (4).

Next, the created packet data is sent to the standby system using the transmission path (8) (step 101), and a timer in the active system packet creation unit (2) is set (step 102).
, wait for a certain period of time (step 103).

In step 104 of FIG. 3, the timer is checked and if the time has elapsed, in step 105 it is checked whether a response packet from the standby system has arrived. If it has arrived, the process ends; if it has not arrived, the process returns to step 103. , during the monitoring time, step 1
Repeat steps 03 to 1°5.

When the monitoring time has elapsed, the process moves to step 106, and the operating system main unit (1) is notified of the abnormality via the abnormality notification line (5).

Further, the processing performed when an equivalently processed packet is received in the active packet creation section will be explained using the flowchart of FIG. 4 and FIG. 1.

First, when the active packet creation unit (2) in FIG. 1 receives an equivalently processed packet from the standby system via the transmission line (8), it creates a response packet as shown in FIG.
Step 110).

The created response packet is transmitted to the standby system via the transmission path (8) (step 111). At the same time, the active packet creation unit (2) notifies the active device main unit (1) that the equalization process has been completed via the equalization process completed signal line (6) (
Step 112). And, the end of the equalization processed notification is as follows.
The active packet creation unit (2) is connected to the end signal line 2 (7).
The operation system main unit (1) is notified accordingly.

Next, the processing when the equalization process is completed in the standby packet generation section will be explained using the flowchart of FIG. 5 and FIG. 1.

First, the equalization processing completion notification from the standby system device main unit (9) in FIG. Packet data as shown in Figure 2 is created (
Step 120 of FIG. 5). At this time, the end of the information from the equivalently processed signal line (14) is the end signal line 2 (15).
will be notified.

Next, the created equal-processed packet data is transferred to the transmission path (
8) to send it to the standby system. Step 121) sets the timer in the standby system packet creation unit (10).
Step 122) and wait for a certain period of time (Step 123).

In step 124 of FIG. 5, the timer is checked and if the time has elapsed, in step 125 it is checked whether or not a response packet from the active system has arrived. If it has arrived, the process ends, and if it has not arrived, the process returns to step 123. Step 1 during the monitoring time
Repeat steps 23 to 125.

When the monitoring time has elapsed, the process moves to step 126, and the standby device main unit (9) is notified of the abnormality via the abnormality notification line (13).

Further, the processing at the time of receiving an equivalent processing request packet in the standby packet generating section will be explained using the flowchart of FIG. 6 and FIG. 1.

First, when the standby packet creation unit (1o) in FIG. 1 receives an equivalent processing request packet from the active system via the transmission line (8), it creates a response packet as shown in FIG. Step 13o).

The created response packet is transmitted to the active system via the transmission path (8) (step 131). At the same time, the standby packet creation unit (1o) connects the equivalent processing signal line (11)
The equal processing request is notified to the standby device main unit (9) (step 132). The end of this equivalent processing request is signaled by the end signal line 1 (12) to the standby packet creation unit (1o
) is notified to the standby device main unit (9).

As described above, the data equalization method of the redundant system of this embodiment allows the operational system to recognize the equalization process in advance by transmitting and receiving control packet data before transferring the changed data, and to confirm reception. Even if a plurality of changes occur at the same time, it is easy to find unchanged data, and the process when an abnormality occurs can be determined.

In the above embodiment, as shown in FIG. 1, one transmission line (8) is used to connect the active system and the standby system, and both control packet data and change data are transmitted and received. An example is shown, but the invention is not limited to this. For example, a path dedicated to control transmission means is set up separately from the normal transmission path, and control packet data is sent and received, and changed data is transferred using the normal transmission path after the processing of the equalization request is completed. It also has the same effect as above.

〔Effect of the invention〕

As explained above, in the data equivalence method of the duplex system according to the present invention, the contents of equalization processing are shared in advance between the active system device and the standby system device using packet data before changing data is transferred. Therefore, even if an abnormality occurs in the active system, unchanged data can be easily found when the standby system takes over processing, so that data equivalence processing can be performed reliably.

In addition, since it is possible to mutually monitor other systems by confirming receipt using response packets, it has become possible to quickly recognize and handle the occurrence of an abnormality.

[Brief explanation of drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention;
Fig. 2 is a configuration diagram of packet data used in an embodiment of the present invention, Fig. 3 is a flowchart when requesting equal image processing in the active packet creation unit, and Fig. 4 is equivalent processing in the active packet creation unit. FIG. 5 is a flowchart when equalization processing is completed in the standby packet creation section. FIG. 6 is a flowchart when the standby packet creation section receives an equalization request packet. FIG. 7 is the conventional flowchart FIG. 2 is a system block diagram showing a data change method of the duplex system of FIG. In Figure 1, (1) is the active device main unit, (2) is the active packet creation unit, (3) and (11) are equivalent processing signal lines, and (4) and (12) are termination signal lines 1. ,(5
), (13) is the abnormality notification line, (6). (14) is the equivalently processed signal line, (7) and (15) are the end signal lines 2, (8) is the transmission line, (9) is the standby system main unit, and (10) is the standby system packet creation unit. be. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] In a data equalization method for a redundant system in which changed data is transferred from the active system to the standby system to perform data equalization processing in order for the standby system to take over processing when a failure occurs in the active system device. , the operational device divides the changed data to be transferred, creates equivalent processing request packet data in which packet data consisting of flags corresponding to each changed data is used as a processing request, and sends the equivalent processing request packet data to the operational device. and monitors the response from the standby device; when the standby device receives the equal processing request packet data, it creates a response packet for acknowledgment of reception and sends it to the active device; Equivalent processing is performed on each changed data sent from the active device to create equivalent processed packet data consisting of flags corresponding to processed notifications for each changed data, and the equivalent processed packet data is transferred from the standby device to the active device. and monitors the response from the active device, and the active device creates a response packet for reception confirmation when receiving the equivalently processed packet data and sends it to the standby device. Data equivalence method for duplex systems.