JPH08123502A - Switching device for stand-by redundant duplex system - Google Patents

Abstract

PURPOSE: To accelerate switching processing by using an equivalent board. CONSTITUTION: The RAS information of respective boards mounted on shelves 5A and 5B are respectively collected to equivalent boards 3A and 3B and based on that RAS information, a switching level file expressing the degree of importance of switching corresponding to the degree of importance of a certain switching factor of a fault is prepared. The prepared switching level file is exchanged between both the equivalent boards 3A and 3B each other through an equivalent transmission line 6. Next, the equivalent board 3A of the active system shelf 5A compares both the switching level files and when the switching level of the active system is higher than that of a stand-by system, switching is executed by dispatching the right of operation from the active system through the equivalent transmission line 6 to the stand-by system. Thus, the burden on a LAN line 4 and control arithmetic boards 1A and 1B for switching processing is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching system for switching to a standby system when a failure occurs in the operating system in a redundant system of a standby redundancy system having an operating system and a standby system.

[0002]

2. Description of the Related Art Conventionally, as a duplex system using a standby redundancy system, there is a configuration shown in FIG. This is the control operation board 1A, 1 on the shelves 5A, 5B, respectively.
B, LAN boards 2A, 2B and equalization board 3A,
The control arithmetic unit of the operating system and the control arithmetic unit of the standby system in which 3B and the like are mounted are connected by the LAN line 4 and are duplicated, and the inside of the broken line in the figure is the duplicated portion. Further, the equalization boards 3A and 3B are connected by a dedicated equalization transmission line 6, through which the input data and operation data of the operating system are sent to the standby system. Valued. Incidentally, 7 in the figure is another control arithmetic unit.

FIG. 4 shows a switching operation in this apparatus, and the switching is concretely performed in the following procedure. (1) Control operation boards 1A, 1B of shelves 5A, 5B
Collects RAS (reliability, availability, maintainability) information of each board mounted on each shelf 5A, 5B. This RAS information is obtained by each board making its own judgment. (2) LAN board 2 is the operation control board 1A
The RAS information collected in the control arithmetic board 1B of the standby system is read via A, the LAN line 4 and the LAN board 2B. (3) The control / calculation board 1A of the operating system checks whether or not the RAS information collected for the operating system has a failure factor that needs to be switched.

(4) If there is a failure factor in its own shelf 5A, it is checked whether there is a failure factor in the RAS information of the standby system of the other party, and if there is no failure factor. Indicates that the switching condition is satisfied. (5) When the switching condition is satisfied, the control arithmetic board 1A
Sends a switching instruction to the LAN board 2A. (6) The LAN board 2A requests switching to the standby LAN board 2B via the LAN line 4 and executes the switching. (7) The control arithmetic boards 1A and 1B switch according to the operating / standby states of the LAN boards 2A and 2B, respectively.

[0005]

However, since these switching processes are executed in the control arithmetic boards 1A and 1B, the RAS information is frequently collected and switched due to the limitation of the processing capacity of the control arithmetic boards 1A and 1B. Is difficult to judge. Further, since the LAN line 4 performs general-purpose transmission, the refresh rate of information in the standby system may be slow. As a result, there is a problem that it takes a long time from the occurrence of a failure to the completion of switching and restoration. The present invention has been made to solve the above problems, and an object of the present invention is to provide a switching device of a standby redundant system that can perform switching processing at the time of failure occurrence at high speed.

[0006]

In order to achieve the above-mentioned object, the present invention provides an operating system control arithmetic unit constituted by mounting a control arithmetic board, a LAN board and an equalization board in each shelf. Standby system control processor and LA
In the switching device of the standby redundancy type redundant system in which both the equalization boards are connected by the equalization transmission line, the R of each board is connected for each shelf.
A means for collecting AS information on the equalization board; and a means for creating a switching level file indicating the necessity of switching from the RAS information collected on the equalization board according to the importance of a switching factor having a failure. The means for exchanging the switching level files between the two equalization boards via the equalization transmission line is compared with both switching level files on the equalization board of the active shelf to compare the switching level files of the active system. When it is higher than the standby system, a means for transferring the operating right from the operating system to the standby system via the equalization transmission line to execute switching is provided.

[0007]

In the present invention, the RAS information of each board is collected in each equalization board for each shelf, and the necessity of switching is indicated based on the RAS information according to the importance of a switching factor having a failure. A switching level file is created. The switching level files created are mutually exchanged between both equalization boards via the equalization transmission line. Furthermore, both switching level files are compared on the equalization board of the active shelf, and if the switching level of the active system is higher than that of the standby system, the operating right is transferred from the active system to the standby system via the equalization transmission line. And the switching is executed. As a result, the LA related to the switching process
The load on N and the control calculation board is lightened.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a switching processing procedure of a switching device of a standby redundant system according to the present invention. Note that the hardware configuration of the system is the same as that of FIG. (1) First, at the time of initializing the system, the control operation boards of both systems pass the information regarding the target board for which RAS information should be collected and the switching factor of each board to the equalization board as the RAS collection definition.

(2) Next, the equalization boards of both systems collect the RAS information of each board mounted on each shelf according to the passed information. This RAS information is obtained by each board on its own judgment. (3) Further, both systems check whether or not the collected RAS information has a failure factor that needs to be switched, and create a switching level file indicating the necessity of switching according to the importance of the switching factor having a failure. create. (4) Next, the equalization boards of both systems exchange their switching level files via the equalization transmission line.

(5) Here, the equalization board of the operating system is
Both switching level files are compared, and when the switching level on the operating system side is higher than that on the standby system, the switching condition is satisfied. (6) Furthermore, the equalization board of the operating system that has determined that the switching condition is satisfied passes the operating right from the operating system to the standby system via the equalization transmission path. That is, since the active equalization board has abandoned the operating right, the standby equalization board is requested to switch when the RAS information is exchanged, and the switching is executed. (7) As a result, the control operation boards of both systems are switched according to the operating / standby states of the equalization boards.

FIG. 2 is an explanatory diagram showing the structure of a switching level file exchanged between the equalization boards of both systems. This file also shows the extent of the fault status of the other party and the self's fault status in numerical form according to the need for system switching, in order to facilitate the decision of the switching, and the least significant bit is the minor failure. The presence or absence of configuration abnormality of the above, the presence or absence of abnormality due to the RAS collection, the presence or absence of the changeover switch ON to the upper order, and the presence or absence of power-off or reset of the control arithmetic board or serious failure to the higher order. . Here, the failure factor of the higher-order bit is more important.

As a result, it is possible to objectively judge which side of the system is in a more normal state by comparing the numerical values of these files created for each system. As described above, according to the present invention, the load on the control arithmetic board is reduced because the equalization board processes the RAS information collection and the switching judgment, which are conventionally processed by the control arithmetic board via the LAN. The amount is reduced accordingly, and the time required for the switching process is greatly reduced. Moreover, these processes are realized only by changing the software without changing the conventional hardware configuration.

[0013]

As described above, according to the present invention, the RAS collected from each board mounted on the shelves of both systems.
The switching decision and switching process based on information
By executing on the equalization board, the load on the control arithmetic board is reduced and the time required for the switching process is shortened. As a result, when the present invention is applied to an electric control plant or the like that performs high-speed control, the control stop time when a failure occurs can be shortened.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a switching processing procedure of an embodiment of a switching device according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a switching level file used in the embodiment.

FIG. 3 is a diagram showing a configuration of a standby redundancy type duplex system to which the present invention is applied.

FIG. 4 is an explanatory diagram showing a switching processing procedure in a conventional example.

[Explanation of symbols]

 1A, 1B Control operation board 2A, 2B LAN board 3A, 3B Equalization board 4 LAN line 5A, 5B Shelf 6 Equalization transmission line

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04L 12/28

Claims (1)

[Claims] 1. An LA control operation device and a standby control operation device, which are configured by mounting a control operation board, a LAN board and an equalization board in each shelf.
In the switching device of the standby redundancy type redundant system in which both equalization boards are connected via N and the equalization transmission path is connected, the RAS information of each board is collected in the equalization board for each shelf. And a means for creating a switching level file indicating the necessity of switching according to the importance of the switching factor having a failure from the RAS information collected on the equalization board, and the equalization between the equalization boards. A method for exchanging the switching level files of each other via the transmission line and the switching level files on the equalization board of the active shelf are compared, and when the switching level of the active system is higher than that of the standby system, etc. A standby redundant system duplication system characterized by including a means for switching the operation right from the active system to the standby system via the binarized transmission path. Switching apparatus.