JPS583199A - Data change system in duplicated system - Google Patents

Abstract

PURPOSE:To prevent the service stop, by providing a means executed for a living system storage device only limited to the data change based on a specific command. CONSTITUTION:A (0) system SYS0 is used for a living system and a (1) system SYS (1) is used for a spare system, and a system constituting section 4 make gates 5 and 6 conductive, in a processor CPU0. Thus, various data stored in a buffer register 3 in the stage of process of an exchange processing section 1 are stored in main storage devices MM0 and MM1 at the same time, and when the living system is transferred from the (0) system SYS0 to the (1) system SYS1, the service stop of an electronic exchanger can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data change method in a duplex system, and particularly to a data change method in a duplex system that simultaneously executes the same data change on an active storage device and a standby storage device.

In general, electronic exchanges store bribe information (subscriber data) regarding accommodated subscribers in a main memory, and refer to the information as needed by a processing unit to proceed with the exchange process. Such subscriber data must be changed immediately when the class of accommodated subscribers is changed or when the number of subscribers is added. - In electronic exchanges that require high reliability, the central processing system consisting of the processing unit and main storage device is often duplicated. In this type of duplex system, the subscriber data is Each is stored in the main memory, and both must be changed whenever necessary.

FIG. 1 is a diagram showing an example of a conventional data change method in this redundant system. In FIG.
yso, and the processing device CPU1 and main storage device MMI constitute a 1-system system 5YS1. When the 0 system 5YSO executes the exchange process as the active system and the 1 system 5yst stands by as the standby system, the gates of the system components in the processing unit gcpoo are made conductive, and the processing unit CPU0 The data accumulated in the buffer register in both systems is 5YSO and -5
It is stored simultaneously in the main memories MMO and MMI of YSI. (See Figure 1) Therefore, various data accumulated in the buffer register during the process by the exchange processing unit in the processing unit CPU0 that controls the exchange process are transferred to the main memory MMO and are simultaneously stored in MMI. As a result, the 0 system system sys due to the processing unit CPU0O failure etc.

Even if processing device C is unable to continue the exchange process,
Using the various data stored in the main storage device MMI from PU0, the processing unit fcPU1 of the single yarn system 5YSI can execute the exchange process glfc and prevent service stoppage of the Tsuneko exchange machine. On the other hand, if it is necessary to change the subscriber data, the maintenance person manually issues a data change command and changed data from the typewriter device TYP to the active processing unit CPU0. Since the modified data is stored in the buffer register 3 by the data modification unit 2, it is transferred to the main memories MMO and M
are simultaneously stored in MI.

As is clear from the above explanation, in the conventional data change method in a redundant system, the 0 system 5y
subscriber data already stored in the main storage device MMO of so;
The subscriber data already stored in the 1st system 5YSIO main recording device MMI will be changed at the same time by the change data input from the typewriter device TYP. Therefore, if the current system 0 system 5YS0 is unable to continue the exchange process because change data containing an error has been input, the 1 system 5YS1, which has undergone a change in the same subscriber data at the same time, also This will cause a failure and the exchange process will stop.

That is, in the conventional control procedure, (i) data in both the active system and the standby system are changed simultaneously from the normal operating state (Fig. 1-■) by a data change command; (Transition 11 to 0 in FIG. 1) (ii) When a failure occurs in the active system due to an error in the changed data in a state where data has been changed (■ in FIG. 1), the processor is switched. (Transition to Figure 1 - ■ 12) ゛←) In the state where the processor is in high condition (Figure 1 - ■),
Since the data of the new working system remains incorrect, it is impossible to continue normal operation, and in order to resume operation, the system file must be reloaded into the memory, and during that time the system is online. Processing will be interrupted.

In this way, in the conventional system, data of both systems are changed at the same time, and therefore, when the processor is switched in the current system due to the data change, there is a drawback that operation cannot be continued in the new current system.

An object of the present invention is to eliminate the drawbacks of the data changing method in the conventional duplex system as described above, and to provide a means for preventing the system from stopping its function even if erroneous data is changed.

The purpose of this is to provide a means for executing data changes based on specific commands only on the active storage device (#1) in a redundant system that simultaneously executes the same data change on the active storage device and the backup storage device. This is achieved by

An embodiment of the present invention will be described below with reference to FIG. 2 and FIG. 5g3.

First, FIG. 2 shows a duplex system 4-4 according to an embodiment of the present invention. The procedure for changing data in the system is shown below.

In Fig. 2, in the case of the present invention, (1) Only the current system data is changed from the normal operating state (Fig. 2-■) by a data change command (Fig. 2-■
Transition to 13) θi) Confirm the normality of the changed data in the active system data change state (Fig. 2-■).

At this time, if a failure occurs in the active system due to an error in the changed data, the processor is switched (transition 15 to ○ in Figure 2).Furthermore, if the normality of the changed data is confirmed, the backup system data change command is issued to the active system. Transfer the data contents to the backup system and match the data contents of both systems. (Transition 14 to Figure 2-○) @) In the state where the processor has been switched (Figure 2-〇),
Since the new working system data is the data before the change, it is believed that normal continuous operation is possible.

Although the new standby system at this time has incorrect data, it is possible to transfer the new active system data and make them match while continuing online processing in the new active system.

In this way, this method has the advantage that even if the processor is switched due to a fault in the active system due to incorrect data modification, operation can be continued in the new active system.

Next, a more detailed explanation will be given with reference to FIG. FIG. 3 is a diagram showing a data change method in a duplex system according to an embodiment of the present invention. In Figure 3, Figures 1 and 2
The same reference numerals as in the figure indicate the same objects. 0 system system 5ys
System o is the active system, system 1 5YSI is the standby system, and the system component 4 in the processing device CPU0 has gates 5 and 6 in a conductive state. Therefore, the various data that the exchange processing unit 1 accumulates in the buffer register 3 during the processing process are simultaneously accumulated in the main memory +tMMO and MMI, and even when the active system shifts from the 0 system 5YSO to the 1 system 5ysi, It is possible to prevent service outage of electronic exchanges. On the other hand, in order to change subscriber data, when a maintenance person inputs a data change command and change data from the typewriter device [TYP], the data change unit 20 that operates based on the data change command transfers the changed data to the buffer register 3. At the same time, an instruction is given to the system component 4 to make only the gate 5 conductive and the gate 6 blocked. As a result, the modified data accumulated in the buffer register 3 is transferred to the main memory fMMO via the gate 5.
Modify subscriber data stored only in. The maintainer uses the O system 5YSO to store the changed subscriber data.
Execute the exchange process and if it is confirmed that it is working normally, use a known method to perform the exchange process.
The same subscriber data changes made to main memory M
Also implemented in MI, both systems 5yso and 5YSI
Match subscriber data. If the 0 system 5yso, which stores changed subscriber data, cannot operate normally, the active system is switched to the l system 5YSI, and the active system is switched to the 1 system 5YSI, which stores unchanged subscriber data. ) Continue the exchange process normally. The main storage device M stores changed subscriber data including errors.
The MO can receive unchanged subscriber data transferred from the main memory MMI in a known manner.

The detailed configuration of the 1-system system 5YSI in FIG. 3 is the same as the 0-system 5yso, so some parts are omitted.

As is clear from the above explanation, according to this embodiment, even if change data including an error is input, only the 0 system 5yso is changed, and the 1 system 5YSI is changed for the subscriber who is not changed. The data allows the exchange process to continue normally.

It should be noted that FIG. 3 is only one embodiment of the present invention, and for example, subscriber data change processing is limited to processing carried out by the processing unit CPU0, and is not limited to "22", and may be performed by the processing unit currently operating as the current system. Although implementation by the device CPU is also considered, the effects of the present invention do not change in that case.Furthermore, the exchange processing section 1, data change section 2, and system configuration section 4 in the processing device CPU0 are realized by a program. Although it may be considered to do so, the effects of the present invention do not change even in such a case.

Furthermore, the object of the present invention is not limited to data entered into electronic exchanges, and its effects will remain the same even if it is applied to other duplex systems or other data.

As described above, according to the present invention, failures caused by data changes in a redundant system are limited to the active system, and it is possible to continue transferring services to the standby system that will not be changed.
This prevents the redundant system from stopping service.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a data change method procedure in a conventional duplex system, M2 is a diagram showing a data change method procedure in a duplex system according to an embodiment of the present invention, and FIG. 3 is a detail of FIG. FIG. 2 is a diagram of a data change method for explaining the configuration. In the figure, SYO is the 0 system, 5Y81 is the 1 system, CPU0 and CP [Jl is the processing unit, MMO
and MMI is the main storage device, TYP is the typewriter device, 1 is the exchange processing section, 20 is the data change section, 3 is the buffer register, 4 is the system component section, 5 and 6 are the gates,
shows. Agent Patent Attorney Taishibe Matsuoka';', -'4.
',';,.

Claims (1)

[Claims] In a redundant system in which the same data modification is executed simultaneously in the active storage device and the backup β-memory storage device, a means is provided to execute only the data modification based on a specific command only in the active storage device, A data change method in a redundant system characterized in that preliminary data is changed or processing equipment is switched after normal confirmation of the data has been completed.