JPS592944B2 - Dual system automatic switching method of hirer-ki duplex system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic duplex switching method for a hierarchical duplex system that enables automatic switching of a lower duplex system even when an upper computer is down.

In a hierarchical computer system, as shown in Figure 1, lower-level computers are used as a duplex system.
In the dual hierarchy duplex system,
When automatically switching between two lower-level computers, the main lower-level computer 1 and the slave' lower-level computer 2, the conventional switching method is as follows.

That is, first, when the upper computer 3 monitors the lower computer or inputs the status of the lower computer, and the upper computer 3 determines that the main lower computer 1 is down, the upper computer 3 Switching from the lower-level computer 1 of the system to the conventional lower-level computer 2 is performed.

Therefore, if the upper computer 3 is down, if the main lower computer 1 goes down while the main lower computer 1 is doing some processing independently of the upper computer 3. When it becomes necessary to switch the system, there is a drawback that automatic switching of the system becomes impossible. This invention has been made in view of the above points, and is an automatic duplex system switching system for a hierarchical duplex system, which enables automatic switching of the lower duplex system even when the upper computer is down. The purpose is to provide a method.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dual system automatic switching system of a hierarchical duplex system according to the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing the configuration of one embodiment.
In this Figure 2, 11 is the upper computer 12 of the hierarchy system, and 13 is 2 as the duplex system.
It is a multiplexed lower-level computer. Further, 14 is a monitor panel that displays the status of the transmission path between the three computers, that is, the upper computer 11 and the lower computers 12 and 13. A transmission line 15 is provided between the upper computer 11 and the lower computer 12.
A transmission line 16 is provided between the three. FIG. 3 shows the status of the system component devices held and displayed by the monitor panel 14.

In FIG. 3, 11a is a display means for displaying the normal or abnormal state of the hardware of the host computer 11. 1
Reference numeral 2a indicates a display means for indicating the normal or abnormal state of the hardware of the lower computer 12, and 12b indicates a display means for indicating the main system or slave state of the lower order computer 12.

Similarly, 13a is a means for displaying the normal and abnormal states of the lower computer 13, and 13b is a means for displaying the main and slave states of the lower computer 13. Further, 15a is a display means for indicating the normal or abnormal state of the transmission path 15 between the upper computer 11 and the lower computer 12, and 16a is a display means for the upper computer 11.
This is a display means for indicating the normal or abnormal state of the transmission line 16 between the lower computer 13 and the lower computer 13. Each of the above display means 11a, 12a, 1
2b, 13a, 13b, 15a, and 16a each use a lamp, a relay, or the like. And display means 1
1a, 12a, and 13a are configured to be displayed by an alarm module in the event of a hardware abnormality. next,
The operation of the duplex automatic switching method of the hierarchical duplex system of the present invention constructed as described above will be explained.

Seven methods of switching operation of the lower computer system using the monitor panel 14 will be explained. However, it is assumed that the duplex system switching is required in the following cases (1) and (2). (1) When the main computer goes down while the lower-level computer is operating as the main system.

(2) When the transmission path between the upper computer 11 and the lower main computer goes down.

Of these (1) and (2), regarding (1), first,
When the subordinate computers 12 and 13 mutually input the status of the other side's computer being down from the monitor panel 14, if they are currently operating as a slave computer, they switch themselves to the master computer.

Then, the display means 12b or 13b for displaying the master system and slave state on the monitor panel 14 is switched from the slave system to the master system. System switching is not performed when the computer is currently operating as the main computer. Also, regarding (2), when the computer is currently operating as the main computer, it is impossible to transmit information with the host computer 11. If so, the status of the higher-level computer is input from the monitor panel 14, and if it is normal, the system of the lower-level computer is switched. Then, the main system and slave system display means (both 12b and 13b) on the monitor panel 14 are switched, and the transmission path state display means (15
a or 16a) to display a transmission path abnormality. The above explanation has been given for the case where one host computer is a simplex system, but the automatic switching of the dual system of the hierarchical duplex system of the present invention can also be applied to a system where the upper host is also a dual system. method can be applied.

As described in detail above, according to the dual system automatic switching method of the hierarchical duplex system of the present invention, the upper computer of a simple system or a duplex system and the dual system as a duplex system In addition to displaying and retaining the status of the transmission path between the two lower-level computers that have been accessed, on the monitor panel, if the lower-level computer is operating as the main computer and the main computer goes down, the status of the transmission path between the two lower-level computers that have been It switches itself to the main computer only when it is running, and switches the display on the monitor panel from the slave to the main computer, and also changes information between the host computer and the host computer when it is currently operating as the main computer. When the transmission path is not possible, if the status of the host computer is input from the monitor panel as normal, the system of the lower computer is switched and at the same time the abnormality of the transmission path determined to be abnormal is displayed. Even when the upper-level computer is down, it is possible to automatically switch the system of lower-level computers that are duplicated as a duplex system.

In addition, when transmission between the host computer and the lower computer becomes impossible, it is possible to determine whether the host computer is down or the transmission line is down, so automatic system switching can be performed only when the transmission line is down, and unnecessary This has the advantage of eliminating the need for system switching.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of a conventional hierarchical duplex system in which lower-level computers are duplicated as a duplex system, and Fig. 2 is a block diagram showing the automatic switching of the duplex system of the hierarchical duplex system of the present invention. FIG. 3 is a block diagram showing the configuration of one embodiment of the system, and is a diagram showing the status of the system component devices held and displayed by the monitor panel in the same embodiment. 11... Upper computer, 12, 13...
Lower computer, 14...Monitor panel, 15,1
6...Transmission line, 11a, 12a, 12b, 13
a, 13b, 15a, 16a...Display means.

Claims (1)

[Claims] 1. A higher-level computer, two lower-level computers with a duplex structure that are connected to this higher-level computer via two transmission paths, and 3.
The computer is equipped with a monitor panel that displays the normal/abnormal state of the computer, the master/slave status of the two lower-level computers, and the status of the two transmission paths, and an alarm module that controls the display of the monitor panel. When the main computer goes down, the slave computer is switched to the main system, the switching status is displayed on the monitor panel above, and when an abnormality occurs in the transmission line connecting the main system's lower computer and the above upper computer, An automatic switching system for dual systems in a hierarchy duplex system, characterized in that the system of the lower-level computer is switched and abnormalities in the transmission path are displayed on the monitor panel.