JPS62125439A - Switching system for information transfer device - Google Patents

Abstract

PURPOSE:To attain non-conflicting switching between the operating systems of two processors by transmitting a switch request to one of both processors via a spare system information transfer device in case the operating system must be switched to a spare system. CONSTITUTION:In a transmission mode an ordinary message is usually transmitted via a transfer device for operating system. While a message related to a switch request is transmitted via a transfer device for spare system in consideration of the possibility of a fault of the operating system. A processor 2 has the functioning reception processing and monitors the incoming of the message through both operating and spare systems. When a switch request is received by the spare system from a processor 1, this request is detected through the reception processing and a switch related message is discriminated. This message is sent to the constitution control processing. Thus the processor 2 can recognize a transfer device switch request given from the processor 1.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a method for switching an information transfer device having a redundant configuration between processing devices that operate asynchronously, and displaying a switching request on the information transfer device itself. The present invention relates to a method in which processing devices at both ends perform communication via a standby system without providing a standby system.

[Background of the invention]

Conventionally, as described in Japanese Patent Publication No. 59-52861, 2
By providing a signal line for switching request display or switching request recognition display between the duplex information transfer devices between two processing units, and setting a switch request to the standby information transfer device when a switching request occurs, operation can be improved. The request display appears on the system, and the other processing device is this? A method has been proposed in which information is detected and switched to the active system, but this method requires signal lines between the information transfer devices, and the configuration becomes complicated when there are three or more transfer devices. Furthermore, in the case of failure switching, the partner processing device performs the switching in accordance with the switching request on the affected communication device, so there is a drawback that this information itself is not reliable. Furthermore, as pointed out in the same publication, there is a method in which the switching request is transmitted via a maintenance device such as a common memory that can be commonly accessed by the processing devices, but as pointed out, there are disadvantages in terms of economy.

[Purpose of the invention]

The purpose of the present invention is to eliminate the need for the information transfer device itself to have an inter-device signal line or switching request display function 2, or a maintenance device such as a common memory. The object of the present invention is to provide a low-cost and highly reliable information transfer bag as a switching method by transmitting and receiving switching request information through a normal information communication device without the need for any equipment.

[Summary of the invention]

The present invention provides information and communication equipment that has a redundant configuration, and when one transfer device flf is used as an active system, it is difficult to use the shared system due to factors such as failures. When it becomes necessary to switch to another standby system, is the standby system information transfer device selected from the cause detection processing unit? This is a method in which switching of the active system is performed without contradiction between two processing devices by transmitting a switching request to the other processing device via the two processing devices.

[Embodiments of the invention]

FIG. 1 shows a configuration diagram of an embodiment of the present invention. An information transfer device 2, 5 is installed between two processing devices 1.2 which are operated asynchronously.
is installed. The number of information transfer devices does not need to be two, and the present invention can be applied even if there are three or more. As an example, information transfer device 1 (number 3 in the figure) is used as the active system, transfer bag @2 (number 4 in the figure) is used as the backup system, and a transfer device switching request occurs in processing device 1. Consider the case.

FIGS. 2 and 3 show the processing flow within the processing device 1.2 in this case. FIG. 2 is a transmission processing flow, and FIG. 3 is a reception processing flow.

When a transfer device switching request occurs in the processing device 1, the process is passed to the configuration management process (number 5 in FIG. 2), and within this process, for the transmission process (number 7 in FIG. 2), the processing device 2 1. Request to send a message ``Transfer device switching request'' to.

In the transmission process, general messages are usually sent via the active transfer device number, or messages related to thread switching are sent via the operational transfer device number.
This is sent via the backup system, considering the possibility of a failure in the active system. On the other hand, in the processing device 2, a receiving process (number 8 in FIG. 3) is functioning, and both the active system and the standby system monitor incoming messages. When a switching request from processing device 1 arrives at the backup system, the receiving process detects this and it is a switching related message? The message is identified and passed to the configuration management process (number 9 in FIG. 3). As a result, the processing device 2 recognizes the transfer device switching request from the processing device 1. In the configuration management process within the post-cognitive processing device 2,
Before executing the switchover of the active system, request the transmission process in the processing device fffi 2 to send a “request recognition” message to the processing device 1 (number 9 in FIG. 6, that is, number 6 in FIG. 2). . In the sending process, this message is sent to the processing device 1 via the backup system. The processing device 1 determines that the reception process is a switching-related message, and passes the message to the configuration management. As a result, the processing device 1 can confirm that the transfer device switching request that it requested has been correctly recognized in the processing device 2 and that the switching has been performed.After this, the processing device 1 can also switch the transfer device. Switch.

〔Effect of the invention〕

According to the present invention), as explained above, the shared system switching of an information transfer device with a redundant configuration can be performed without having the information transfer device itself have a switching request display function, and without having an information transfer bag or a signal ls signal between Okima. , Also, maintenance equipment such as common memory between both processing units? Since this can be carried out without the need for any additional devices, the structure of the information transfer device can be simplified and made more economical.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a system according to an embodiment of the present invention, and FIG. 2 shows a relationship between configuration management processing and transmission processing in a processing device, and functions showing an outline of each processing. Flowchart FIG. 3 is a functional flowchart showing the relationship between reception processing and configuration management in the processing device, and showing an outline of each processing. 1.2...Processing device 4...Information transfer device 7...Transmission processing 8...Reception processing

Claims (1)

[Claims] 1. Comprising first and second processing devices that are operated asynchronously and a plurality of information transfer devices that are provided between the first and second processing devices and control the transfer of information between both processing devices. Both processing devices transmit the switching request of the information transfer device to the other processing device via the backup information transfer device, and the other processing device sends a switching request recognition signal to the requesting processing device, also via the backup information transfer device. The request source has a function to switch the information transfer device at the same time as the information transfer device is transmitted, and the request source switches the information transfer device after confirming the switching request recognition signal, and performs switching due to a failure of the information transfer device, etc. using the above-mentioned internal function of the processing device. An information transfer device switching method characterized by: