JPH063592B2 - Automatic switching method for hierarchical compound computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a layer that enables automatic switching to a normal computer or a transmission line when a computer for each layer or a transmission line between computers in each layer is abnormal. The present invention relates to an automatic switching method for a computerized multiple weight computer system.

[Conventional technology]

FIG. 3 is a system block connection diagram for explaining an automatic switching system of a conventional hierarchical dual computer system disclosed in Japanese Patent Laid-Open No. 55-99658, for example.
1 is a high-ranking high-level computer, 2 and 3 are low-level, one master-slave low-level computer forming a dual system, and 4 is whether each of the computers 1, 2 and 3 is down. A monitor panel that displays whether or not the transmission path of information and the information that connects the high-order computer 1 and the low-order computers 2 and 3 is normal, and 5 and 6 are the transmission paths of the information.

Next, the operation will be described. The system switching operation method of the subordinate computer using the monitor panel 4 will be described. However, it is necessary to switch the dual system in the following 1
The case of 2 is assumed.

1. When the main computer is down while the subordinate computer 2 or 3 is operating as the main system while operating as its main system.

2. Transmission line 5 between upper computer 1 and lower computer 2 or 3
Or when 6 goes down.

Regarding 1. of these 1 and 2, first, when the lower computer 2 or 3 mutually inputs the down status from the monitor panel 4 to each of the other computers 3 or 2, one of them becomes the current subordinate computer. When operating, switch the other side to the main system. When one of these is operating as the main system, system switching is not performed.

Regarding item 2, when one of the lower-level computers 2 or 3 is currently operating as the main computer, when information transmission with the higher-level computer 1 is impossible, for example, when the transmission path 5 is abnormal, the monitor panel If the state of the host computer 1 is input from 4 and the other transmission line 6 is normal, the system of the host computer is switched.

[Problems to be solved by the invention]

Since the conventional automatic switching system of the hierarchical dual-system computer is configured as described above, when the dual-system configuration of the duplex system is provided by providing the high-level computers 1 and 1a as shown in FIG. When the computer 1 and the subordinate computer 2 are main systems and only the transmission line 5a is abnormal and the system is operating normally, when the transmission line 5 newly becomes abnormal, the subordinate computer 2 , The system as a whole does not become normal even if the system is switched. Further, if the lower computer 2 of the master system goes down under the same conditions as above, there is a problem that the entire system does not become normal only by switching the lower computer 3 of the slave system to the master computer.

The present invention has been made to solve the above-mentioned problems, and when the abnormality occurs in the computer of each layer and the transmission line of information, the duplication system is switched to minimize the influence of the abnormality on the entire system. It is an object of the present invention to obtain an automatic switching method for a hierarchical compound computer system.

[Means for Solving the Problems] The automatic switching method of the hierarchical compound computer system according to the present invention is such that when the master-slave computers of each tier are connected by a data link, the higher-order computer and the lower-order computer are Is also connected to the main system transmission line, it is judged in the main system transmission line judgment step, and if it is judged that it is connected to the main system transmission line, the system switching of the lower computer is performed. Determines whether a normal main system-main system connection relationship can be configured by the first connection relationship determination step, and if it is determined that such a connection relationship can be configured, the first connection In the system switching step, when the lower computer is switched from the master system to the slave system and it is determined that the above-mentioned master-master connection relationship cannot be configured even by the above-mentioned subsystem switching, the second connection relationship is established. In the judgment step, It is determined whether or not a normal main system-main system connection relationship can be configured by the system switching of the host computer. If it is determined that such a connection relationship can be configured, the second system switching step is performed. The upper computer is switched from the master system to the slave system.

[Action]

The data link between the master-slave computers for each tier in the present invention manages and processes the down of the master-slave computers and the down of the transmission line between the tiers, which require switching of the multiplex system, respectively, that is, the master-slave. When one of the computers in the above is down, the system is switched to the other computer using the data link in that layer, and when the transmission line is down, the upper computer is the computer in each of the upper and lower layers. And the status of each transmission line are combined to determine the system switching so that the computer route of the main system is established for the entire system, that is, the normal one is automatically switched with the main system as the main system. For the transmission line error of the computer of each rank
The whole system works to minimize the damage.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, 7 is a data link inserted between the master-slave high-order computers 1 and 1a, and 8 is a data link inserted between the master-slave low-order computers 2 and 2a, each of which acts as a communication line for coding and transmitting data. The same components as those shown in FIG. 4 are designated by the same reference numerals, and the duplicated description will be omitted.

Next, the operation of the present invention will be described. However, it is the following two items, which are the same as the items described in the prior art, that require switching of the dual system.

1. When the main calculator is down.

2. When the transmission path between the upper and lower computers goes down.

Of these, 1 is 2 for each of the upper and lower computers.
Switch the heavy system. In other words, in the high-level computers 1 and 1a,
Mutual monitoring is performed using the data link device 7, and when the main computer, for example, the upper computer 1, goes down, the slave computer 1a
However, the main system is switched by the downed information. When the slave host computer 1a goes down, the system is not switched. The lower computers 2 and 3 perform the same switching as the upper computers 1 and 1a using the data link device 8. On the other hand, for 2 all, the upper computer 1, 1a,
The necessity / non-necessity of switching of the lower computers 1, 1a, 2 and 3 is determined, and the system is switched from the upper computer.

This is a control operation by a program, which will be described with reference to the flowchart of FIG. Judgment items are divided into three stages. First, when an abnormality occurs in the transmission lines 5, 5a, 6, 6a, it is determined whether or not the transmission lines 5, 5a, 6, 6a are both main and lower computers 1, 1a, 2 and 3. judge. That is, if it is a slave system, switching between the upper and lower dual systems is not performed (main system transmission line determination step a).
Next, by switching the systems of the low-order computers 2 and 3, a normal high-order dual-system computer is configured by the main high-order computer, for example, the high-order computer 1, the new main system, for example, the low-order computer 3, and their transmission paths, for example, the transmission path 5a. It is determined whether or not it is possible (first connection relation determination step b). If possible, the master system upper computer 1 issues a command to the slave system lower computer 3 to switch the system to the master system to switch the system to the dual system (first system switching step c). If a normal hierarchical dual-system computer cannot be configured even with the system switchover of the lower-level computers, check whether a normal configuration is possible when the system switchover between the upper-level computers 1 and 1a is performed at the end (second connection relationship). Decision step d). If it is possible, the master high-order computer itself, for example, the high-order computer 1, goes down and notifies the slave high-order computer 1a to switch the slave high-order computer 1a to the master system (second system switching step e). If a normal hierarchized dual system computer cannot be constructed even by switching the dual system of the upper-level computers 1 and 1a, 2
The heavy system is not switched.

In the above embodiment, the hierarchy is the upper and lower two hierarchies, and the dual system has one set of the upper duplex and the lower duplex, but the items necessary for system switching of the dual system and the concept of control are described. In the same manner, the same effect as that of the above-described embodiment can be obtained even if there are two or more hierarchies and the duplex system has two or more lower duplexes.

〔The invention's effect〕

As described above, according to the present invention, the items that require switching of the multiplex system are classified into two, and when one of the master and slave computers is down, the system is switched at that level. The host computer is designed to switch over the multiplex system by considering the entire computer system, that is, the master-slave computer state of each layer and the transmission line state between layers, so that each abnormality is Has the effect of minimizing the effect on the entire system and allowing normal operation of a normal multi-tiered computer system.

[Brief description of drawings]

FIG. 1 is a system block connection diagram of a hierarchical compound computer system according to an embodiment of the present invention, FIG. 2 is a flow chart showing a control operation by a computer and a transmission path switching program, and FIGS. 3 and 4 are It is a system block connection diagram of the conventional hierarchized dual system computer system. 1, 1a is a master-slave computer, 2, 3 is a master-slave computer, 5,
5a, 6 and 6a are transmission lines, and 7 and 8 are data links.

Claims (1)

[Claims] 1. In an automatic switching method of a hierarchical compound computer system in which a plurality of computers having a master-slave relationship with each of at least two hierarchies are connected by a data ring, when the computer is abnormal, the abnormal computer is A computer determination step to determine whether it is the main system of the upper computer and the lower computer, a computer switching step to switch the slave computer to the main system when it is determined to be the main computer, and a transmission line error In this case, the main system transmission line determination step of determining whether both the upper computer and the lower computer connected to the abnormal transmission line are main systems, and the computer connected to the abnormal transmission line is If it is also determined that the main system is also the main system, the first connection relationship determination step of determining whether or not a normal main system-main system connection relationship can be configured by switching the system of the lower-order computer. Such primary system - if the connection relationship of the main system is determined to be constructed including a first system switching step of switching the lower computer from the main system to the slave, by system switching of the lower computer,
When it is determined that the main system-main system connection relationship cannot be configured, it is determined whether or not a normal main system-main system connection relationship can be configured by system switching of the host computer. A relationship determining step and a second system switching step of switching the host computer from the master system to the slave system when it is determined that such a main system-master system connection relationship can be configured. Automatic switching system for layered compound computer system.