JPH0846685A - Electronic exchange - Google Patents

Abstract

PURPOSE:To automatically select a standby system when a hard disk storing a program to activate an electronic exchange is faulty. CONSTITUTION:The electronic exchange has a duplicate configuration such as master switches 100, 101, line circuits 102, 103, trunk circuits 104, 105, central processing units 106, 107, memory circuits (RAMs) 108, 109., hard disk units 112, 113, and hard disk control circuits 110, 111 and the central processing units 106, 107 manage contents of the hard disk units 112, 113 of both the systems to update the contents so that they have the same contents at all times. When a state that the same content cannot be written to the hard disk units 112, 113 of both the systems such as occurrence of a fault in the active system and the hard disk of the standby system is available of writing, since a difference takes place in the written contents, the content of the difference is copied from the hard disk of the standby system to the hard disk of the active system when the fault is recovered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used for backing up a hard disk of an electronic exchange. The present invention relates to a backup method for efficiently replacing a hard disk that stores a program for operating an electronic exchange when a failure occurs.

[0002]

2. Description of the Related Art In a conventional electronic exchange having a built-in hard disk, when a hard disk is duplicated, a difference manager manages each difference, and when a change occurs in the contents of the hard disk, the maintenance person manually operates both of them. I was writing to the hard disk.

[0003]

In the conventional electronic exchange with a built-in hard disk, when the hard disk is duplicated, the difference management of each and the writing when a change occurs due to the difference are performed manually by a maintenance person. However, there was a problem that it took a lot of work time and human error was likely to occur.

The present invention solves such a problem, and automatically switches over to a standby system when a hard disk fails due to a failure or other abnormality, eliminating the need for manual operations by maintenance personnel and eliminating human error. It is an object of the present invention to provide an exchange that can avoid occurrence.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a backup of a hard disk, and includes a main switch, a line circuit connected to the main switch, a trunk circuit connected to the main switch, and a main switch. A central control device for controlling, a RAM memory circuit used for the arithmetic operation of the central control device, a hard disk for storing an arithmetic program and arithmetic data of the central processing unit, and a hard disk control circuit for connecting the hard disk to the central control device In a duplicated electronic exchange in which two systems are provided in parallel, and these two systems are operated in parallel, the central control unit writes the same information to both the hard disks of the two systems. Means for automatically recording that a difference has occurred in the write information when no data is written, Dodisuku characterized in that it comprises a means for copying the write information the difference when it becomes the write and can read has been recorded that occur simultaneously.

[0006] The recording means includes a means for setting a flag when a difference occurs in the recorded contents of the second system for each partition of the hard disk, and the copying means includes a means for setting when a parallel operation is resumed. Means for completely copying the information of the flagged partition, and means for canceling the flag when copying is completed, wherein the flagged system becomes the act system, and the system without the flag becomes the standby system. It is desirable that the copying means be automatically activated when the two systems are operated in parallel.

[0007]

When a failure occurs in the act-type hard disk, the act-type hard disk is switched to the standby-type hard disk, and the standby-type hard disk is switched to the act-type hard disk. Since the failed hard disk of the act system is taken out of the operation state to check the operation, the data generated during this time is written only to the hard disk which was the standby system. Therefore, a content difference occurs between the removed act-type hard disk and the write difference flag in the act-type hard disk is turned on at this time. When the failed hard disk recovers,
The write difference flag is checked, and if there is a partition in the ON state, the difference data is copied from the partition to the hard disk restored to the act system side.

In this way, even if a failure occurs in the act-type hard disk, it is automatically connected to the standby-type hard disk immediately, so that the operation of the electronic exchange can be continued and the maintenance person can be troubled. No longer
It is possible to eliminate mistakes caused by human operation.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention.

The embodiment of the present invention includes a main switch 100, 101, line circuits 102, 103 connected to the main switch 100, 101, and a main switch 10 respectively.
Trunk circuits 104 and 105 connected to 0 and 101
Central control units 106 and 107 for controlling the main switches 100 and 101, RAM memory circuits 108 and 109 used for the arithmetic operations of the central control units 106 and 107, and arithmetic programs and arithmetic operations of the central processing units 106 and 107. Hard disks 112 and 113 for storing data,
The hard disks 112 and 113 are connected to the central controller 10
6, a hard disk control circuit 110 connected to 107;
111 are provided in parallel, and the two systems are duplexed so as to be operated in parallel.

The central control units 106 and 107 have the above-mentioned two units.
Means for automatically recording that a difference has occurred in the write information when the same information has not been written to both the system hard disks 112 and 113; Means for copying the write information which records that the difference has occurred when writing and reading are enabled.

The recording means includes a hard disk 1
A means for setting a flag when a difference occurs in the recorded contents of the 2nd system for each of the 12 and 113 partitions is included, and the copying means is set to the flag when parallel operation is resumed. Includes means for copying the entire partition information and means for canceling the flag when copying is completed. The system with the flag set becomes the act system, and the system without the flag becomes the standby system. Are configured to be automatically activated when the parallel operation is performed.

Main switches 100, 101, line circuit 1
02, 103 and trunk circuits 104, 105 are controlled by central control units 106, 107. Further, the hard disks 112 and 113 are connected to the central control units 106 and 1 via hard disk control circuits 110 and 111, respectively.
It is managed and controlled by 07. Also, the main switch 10
0, 101, the line circuits 102, 103, the trunk circuits 104, 105, and the memory circuits 108, 109, respectively.
The standby system side is controlled by the standby system central controller 107. Similarly, the hard disks 112 and 113 are controlled on the act system side by an act system hard disk control circuit 110, and on the standby system side by the standby system hard disk control circuit 111.
Controlled by. However, the hard disk control circuit 11
Regarding 0 and 111, both systems are controlled by the device on the act side of the central control devices 106 and 107.

Initial system data, programs, system management / control data, etc. are written in the hard disks 112 and 113 in advance, and the contents of both systems are changed whenever the system status, each circuit, or line setting is changed during operation. Of the hard disk 112, 113.

Next, the operation of the embodiment of the present invention thus constructed will be described. FIG. 2 is a flow chart showing the flow of hard disk monitoring control by the central processing unit on the act system side in the embodiment of the present invention.

When the standby hard disk 113 or 112 is stopped, the central control unit 106 or 107 determines whether or not the own hard disk 112 or 113 has been written.
Flag the partition where the write was done. Next, it is determined whether or not the standby hard disk 113 or 112 has been recovered, and if recovered, it is determined whether or not there is a flag. If there is a flag, the contents of the flagged partition are copied from the own system hard disk 112 or 113 to the standby system hard disk 113 to 112.

FIG. 3 is a state transition diagram illustrating switching of the hard disk in the embodiment of the present invention. First, as shown in FIG. 2A, when the hard disk 112 is an act system and the hard disk 113 is a standby system, when a failure occurs in the act hard disk 112, as shown in FIG. Hard disk 11
2 to standby system, standby hard disk 1
13 is switched to the act system.

At this time, the failed hard disk 112 is taken out of the operation state to check the operation, and is replaced in the case of a severe failure. The writing of the data generated during this period is performed only to the standby hard disk 113, but this causes a difference between the act hard disk 112 and the standby hard disk 113.

As described above, when data is written only to the hard disk 113 of the act system, the write difference flag in the hard disk 113 of the act system is turned on. The differential flag is set for each partition, and when the hard disk 112 that has become the standby system side due to a failure is restored, this flag is checked and the partition for which the differential flag is in the ON state becomes the act system side. If it exists in the hard disk 113, the data in the partition is copied from the hard disk 113 to the hard disk 112 restored to the act system side.

[0020]

As described above, according to the present invention, the redundant hard disks are maintained in the same state at all times, and when a failure occurs in one of the hard disks, the hard disks of the other system are immediately replaced. Since the operation can be automatically switched and the operation can be continued and the hard disk can be managed by the central control unit, there is an effect that human error can be eliminated without the need for the maintenance person to work.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a flowchart showing the flow of hard disk monitoring control by the central processing unit on the act system side in the embodiment of the present invention.

FIGS. 3A and 3B are state transition diagrams showing hard disk switching in an embodiment of the present invention.

[Explanation of symbols]

 100, 101 Main switch 102, 103 Line circuit 104, 105 Trunk circuit 106, 107 Central controller 108, 109 Memory circuit 110, 111 Hard disk control circuit 112, 113 Hard disk

Claims (3)

[Claims] 1. A main switch, a line circuit connected to the main switch, a trunk circuit connected to the main switch, a central controller for controlling the main switch,
A system including a RAM memory circuit used for arithmetic operation of the central control unit, a hard disk for accumulating arithmetic programs and arithmetic data of the central processing unit, and a hard disk control circuit for connecting the hard disk to the central control unit in parallel In a duplicated electronic exchange system in which two systems are installed in parallel and the two systems are operated in parallel, when the same information is not written in both of the two system hard disks in the central controller Means for automatically recording that a difference has occurred in the write information, and write information in which it is recorded that the difference has occurred when the hard disk of the second system becomes writable and readable at the same time. And a means for copying the electronic exchange. 2. The recording means includes means for setting a flag when a difference occurs in the recorded contents of the second system for each partition of the hard disk, and the copying means resumes parallel operation. 2. An electronic exchange according to claim 1, further comprising means for copying the information of the partition having the flag set at all times and means for canceling the flag when the copying is completed. 3. When the flagged system becomes an act system and the system without a flag becomes a standby system and the two systems are in a state where parallel operation is performed, the copying means is automatically operated. The electronic exchange according to claim 2, which is activated automatically.