JPS60114955A - Decentralized processing computer system - Google Patents

Abstract

PURPOSE:To back up the function of a faulty low-order computer by means of a high-order computer by providing the backup function of the high-order computer to the low-order computer and a switching means switching and connecting an input/output device of each low-order computer to the high-order computer. CONSTITUTION:Moving contacts 12, 13 of changeover switches 10A-10C are switched from fixed contacts 14, 15 to fixed contacts 16, 17 by exciting a relay 11. Thus, input/output devices 4A-4C belonging to all low-order computers 2A- 2C are connected directly by the changeover switches 10A-10C. Thus, if the low-order computer 2A is fautly, its input/output device 4A is connected directly to the high-order computer 1 by the changeover switch 10A, and the function is backup. Even if another low-order computer is faulty in this state further, the function is backed up.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a distributed processing computer system, and particularly to processing when any one of a plurality of computers that perform distributed processing of functions fails.

[Prior art]

Conventionally, as this type of system, the system shown in FIG. 1 is known. In the figure, 1 is the upper computer, 2A to 2C are the lower computers, 3 is the common spare computer for the lower computers, and 48 to 2C are the lower computers.
4C is the input/output device for lower-level computers 28-2C, 5A-5C
is a changeover switch that switches the connection of the input/output devices 48 to 4C from the lower-level computers 2A to 2C to the common spare computer 3.

The operation of the distributed processing computer system having such a configuration will be explained. The lower-level computers 2A to 2C process input signals from processes connected to each other through their respective input/output devices 4A to 4C, and output instructions to the processes, or transmit input signals to the higher-level computer 1. The higher-level computer 1 processes management functions or common functions using signals transmitted from the lower-level computers 2A to 2C.

In addition, a command signal is transmitted from the higher-level computer 1 to the lower-level computers 28 to 2C, and the lower-level computers 2 perform processing based on the command signal.
A to 2C may be executed and instructions may be output to the process via the input/output devices 4A to 4C. Here, among the plurality of lower-level computers, for example, one of lower-level calculations 1,132 A
When a machine fails, the changeover switch 5A belonging to it is activated, and the input/output device 4A is switched and connected to the common spare computer 3. The calculation processing of the lower-level computer 2A is executed by the common spare computer 3, so that the functions of the entire system can be continued without being impaired.

However, since the conventional distributed processing computer system is configured as described above, it is necessary to provide a common spare computer 3, and if two or more lower-level computers fail at the same time, they are connected to the common spare computer 3. This has the disadvantage that only the functions of one lower-level computer corresponding to the input/output device that has been installed are backed up, but the functions of other lower-level computers are not backed up and their functions stop. In order to eliminate this drawback, it would be sufficient to increase the number of common spare computers 3, but this would result in a drawback that the control circuit configuration of the changeover switch would also become complicated.

[Summary of the Invention] The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and is to allow a higher-level computer to hack up a lower-level computer. The present invention will now be described in detail.

[Embodiments of the invention]

FIG. 2 is a circuit diagram showing an embodiment of the distributed processing computer system according to the present invention, and the same reference numerals are used for the same parts as in FIG. 1. In the figure, reference numerals 108 to 10C are changeover switches, which operate by energizing the relay 11 to switch the movable contact 12.13 from the fixed contact 14.15 to the fixed contact 16.17. Input/output devices 4A to 4 belonging to calculation ta2A to 2C
C is also connected to host computer 1 by switching switch IOA to IOC.
can be directly connected to. Therefore, for example, if the lower-level computer tJlt 2 A fails, its input/output device 4A is directly connected to the higher-level computer 1 by the changeover switch IOA, and bank amplification of its function is performed. Furthermore, even if another lower-level computer fails in this state, the input/output device belonging to that lower-level computer is connected to the higher-level computer 1, and its functions are similarly upgraded.

In the above embodiment, the upper computer and the plurality of lower computers are connected by one-to-one signal lines, but the same effect can be obtained even if the transmission is performed in a loop.

Furthermore, although the case where there is one host computer has been described, the present invention can also be applied to a system in which two host computers are configured to back-amplify each other. Reliability can be improved.

〔Effect of the invention〕

As described above, according to the distributed processing computer system according to the present invention, even if not only one lower-order computer but a plurality of lower-order computers fail, all of their functions can be bank-amplified by one higher-order computer.

Furthermore, a common spare computer is not required, which reduces costs and improves reliability.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an example of a conventional distributed processing computer system, and FIG. 2 is a circuit diagram showing an embodiment of the distributed processing computer system according to the present invention. 1...Upper computer, 28~2C...Lower computer, 3
... common spare computer, 4A to 4C ... input/output device,
5A to 5C, IOA to IOC...selector switch. In the figures, the same reference numerals are used for the same or corresponding parts. Agent Masuo Oiwa (and 2 others)

Claims (1)

[Claims] In a distributed processing computer system consisting of a plurality of lower-level computers that process functions specific to each process via input/output devices, and a higher-level computer that processes the management functions or common functions of each lower-level computer, The present invention is characterized in that the lower computer has a puncture amplification function and is provided with a switching means for switching and connecting the input/output device of each lower computer to the higher level computer, so that the higher level computer can bank up the functions of the failed lower level computer. Distributed processing computer system.