JPS59178548A - Multiplexed system controlling system - Google Patents

Abstract

PURPOSE:To allot a spare central processing unit on priority basis always to a central processing unit of information processing system highest in importance in the system by changing combination of relation of presently used and spare between central processing units. CONSTITUTION:CPUs 91-93 constitute independent systems C, D, E respectively and perform business processing. Out of these systems, C-system is the highest in importance, and D-system is the lowest. The CPU 92 of D-system allotted as a substitute for C-system, and the CPU 92 is also allotted as a substitute for E-system. For instance, if the CPU 91 of C-system failed, the CPU 92 suspends processing of its own D-system and takes the place of failed one, and continues business of C-system making use of connecting route to an input/output controlling device 121 and determines the CPU 93 as a substitute. Consequently, the CPU 93 loads a controlling program of C-system in a memory as a substitute for the CPU 92, and waits while continuing its own E-system making use of connecting route to a magnetic disk 161.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention includes a plurality of central processing units in order to configure a highly reliable information processing system, and usually each central processing unit is configured as a core. If the central processing unit of a highly important system fails, the central processing unit of another system in the system takes over and continues processing of that highly important system. The present invention relates to a control method for replacing a central processing unit in a multiplexing system of the type described above.

(2) Prior art and problems FIG. 1 is a diagram showing an example of the configuration of a conventional multiplexing system. -11 is a central processing unit;2. ．． 2. 3 is a line switching device; 3 is a system switching device; 4. , 4
．． is an input/output control device; 5. ．． 5. is a magnetic disk controller, 68.6! is a display device, 7i7. 8. is a paper tape reading device; ．． 8! represents a magnetic disk pack device.

In the configuration shown in FIG. 1, the central processing unit 1t is the central processing unit 1. When either of the central processing units 1m and 1m breaks down, it is provided as a standby unit to perform processing in its place. In order to enable quick switching in the event of a failure, the memory of the central processing unit 1. A core system (hereinafter referred to as A system) and a central processing unit1. The control program for the system (hereinafter referred to as B system) whose core is B is loaded together. Also, line switching device 21121, input/output control device 4. ．． 4. and magnetic disk controllers S, , S, respectively have their own central processing unit and standby central processing unit 1. and have a connection to both routers. In a system with this configuration, for example, if the central processing unit 11 fails, the system switching device 6 immediately makes the connection route between the central processing unit 1 and the input/output control device 41 logically valid. The central processing unit 1. By loading the memo IJ and running the A-system control program, the central processing unit 1! An A system is constructed with this as the core.

At this time, the B system is operated in a simplex configuration without a standby unit. Thereafter, when the central processing unit 11 that failed earlier is repaired, switching is performed again, and the central processing unit 1. becomes a spare machine.

A system with such a configuration has the advantage that the hardware configuration is simple and the control related to system switching is easy, and high-speed switching can be expected.
If a failure occurs once and the central processing unit has been switched, if the central processing unit fails again, the system will be completely down and operations will not be able to continue, resulting in high costs. The drawback was that reliability could not be expected.

FIG. 2 is a diagram showing another example of the configuration of a conventional multiplexing system, in which 1'1 to 1' are central processing units, 2/,
2/ and line switching devices 4'1 to 4'.

is an input/output controller, 5' is a magnetic disk controller, and 6' is an input/output controller.
, ~6', is a display device, and 7', ~7/.

denotes a paper tape reading device, and II' denotes a magnetic disk pack device.

In the configuration shown in FIG. 2, central processing units 1'1 to 1'
, each form an independent system and perform separate processing, but if one of the central processing units fails,
Any other central processing unit is controlled so that it can continue the processing of the system in place of the failed central processing unit.

That is, the memory of each central processing unit is loaded with all the control programs for the respective central processing units 1', ~1', and the core system υ, and the input/output control unit 4/ , ~4' The magnetic disk control unit 51 has connection routes to all central processing units in the system, and if any central processing unit fails, the system switching device operates. Another central processing unit is immediately assigned to continue processing, and if another central processing unit fails thereafter, another central processing unit is assigned again. In this way, the most important system in the system is controlled so that a spare machine is always present.

A system with a large number of central processing units with this configuration can achieve high reliability, but on the other hand, the control associated with system switching and the management of shared magnetic disk files are extremely complex, making it difficult to quickly The drawback was that one could not expect nine changes.

(3) Purpose of the Invention In view of the above-mentioned conventional drawbacks, the present invention provides easy control of system switching and management of shared magnetic disk files.
The purpose of the present invention is to provide a control method for a multiplexed system that provides high reliability.

(4) Structure and object of the invention According to the present invention, as described in the claims, there is provided a data processing system consisting of a plurality of information processing systems, in which the current central processing unit of the information processing system fails. In a multiplex system, the current use is necessary because the central processing unit of another information processing system in the system is allocated as a backup to replace the central processing unit and continue the business processing of the information processing system. Accordingly, it is allowed to have 91 spares, and the spares can be used for their own information processing system, and can also be used as spares for multiple other information processing systems. By determining the relationship between each central processing unit and changing the combination of active and standby relationships between central processing units whenever a change occurs in the relationship between each central processing unit due to equipment failure, This is achieved by the multiplex system control method, which is characterized by always allocating spare central processing units preferentially to central processing units of information processing systems with high performance.

(5) Embodiment of the invention Figure 3 is a diagram showing the system configuration of one embodiment of the invention.
．． ~9s is the central processing unit, '01%10' is the line switching device, 11 is the system switching device, 121-128
is an input/output control device, 130.13! 1 is a magnetic disk control device, 141-14 is a display device, 151-1
5@ is a paper tape reading device, 161, 16. represents a magnetic disk pack device.

In FIG. 3, central processing units 91-9. Each of them constitutes an independent system and processes business. That is, the central processing unit 9. is connected to the input/output devices under the input/output control device 121 to form one information processing system (hereinafter referred to as C system).
Is it configured as a central processing unit?・Input/output control' device 12. It is connected to subordinate input/output devices to form an independent information processing system (hereinafter referred to as "subsystem"), and similarly, central processing unit 9 is connected to input/output devices subordinate to input/output control device 128 to form E system. (In the figure, the input/output control device 12
．． ~12 have connection routes to each central processing unit, but among them, the connection route to the own central processing unit is logically utilized).

The C system is a line switching device 10. A communication line accommodated in the E system is connected to the line switching device 10!
A communication line housed in is connected.

The magnetic disk control device 151 is connected to the C system and the D system, and the magnetic disk pack device under it is shared by both systems. It is also connected to the magnetic disk control device 15mIdD system and E system, and the subordinate magnetic disk pack device is shared by both systems.

Magnetic disk controller 151.13. Each has a connection route to each solid device, but only the connection route to the related gold thread central processing unit is logically utilized.

The C system is the most important system in this system, and the E
System D is the next most important system. Then, a central processing unit 9 of the D system is used as a replacement machine of the C system. At the same time, the central processing unit 91tl of the D system is allocated as a replacement machine of the E system. Therefore, the central processing unit 9
．． In addition to its own control program, the C system and E system are stored in memory.
It also loads the system control program, and as mentioned above, the magnetic disk pack device is shared with each system.

For example, a C-based central processing unit 9. If the fails,
Central processing unit9. stops the processing of its own system (D system) and takes over, and the input/output control device 12. We will continue C-related work by taking advantage of the connection route with. Furthermore, the central processing unit 9.
is defined as the replacement machine. As a result, the central processing unit 9. is E
The E-system central processing unit 98 is freed from its role as a system replacement, and conversely loads the C-system control program into the memory to serve as a replacement for the central processing unit 9. After making full use of the connection route with 16I,
It is on standby while continuing the business processing of its own system (E system), and when the nine central processing units fail, it continues the work of the C system in its stead.

In this way, two central processing units in the system are always kept in a working-standby relationship as a specific pair, and when one of the central processing units breaks down and conditions arise that make it impossible to continue that relationship, it is necessary to , the relationship between the active and backup units is determined between each central processing unit, and control is performed so that the backup unit is always assigned preferentially to the system with the highest degree of importance. Although this embodiment describes the case where there are three central processing units, the method of the present invention can be applied even when there are many central processing units.
Since two of them are always handled as a set, it is possible to implement the control in exactly the same way.

(6) Effects of the Invention The multiplex system control method of the present invention replaces the central processing unit of each information processing system of a data processing system consisting of a plurality of information processing systems when the central processing unit fails. Since other central processing units that should perform business processing for the information processing system are identified, control between the relevant central processing units can be performed independently of the other central processing units, so control related to system switching and shared magnetic It is easy to manage disk files, and the combination of active and spare central processing units is adjusted in response to changes in the system environment due to failures of central processing units, etc. The effect is dog because you can get high reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the configuration of a conventional multiplexing system.
FIG. 2 is a diagram showing another example of the configuration of a conventional multiplexing system, and FIG. 3 is a diagram showing the system configuration of one embodiment of the present invention. 11-1111'1-1',...Central processing unit,",2m,21..2',...Line switching device,3.3'...System Switching device, 4..4..4', ~4'1... Input/output control device, 5,.5., Da... Magnetic disk control device, 61.69.6' , ~6',... Display device, 7..7..7'1 to 7'1... Paper tape reading device, a,, a,, s'... ...Magnetic disk pack device, 91~?, ...Central processing unit, + 0..10. ...Line switching device, 11... Song system switching device, 12 .~121・
...Input/output control device, +31,13.・・・・・・
magnetic disk control device, +4. ~14°...Display device, 151~15. ...Paper tape reading device, 16. ．． 161...Magnetic disk pack device

Claims (1)

[Claims] In a data processing system consisting of multiple information processing systems, when the current central processing unit of the information processing system fails, a backup system is installed in the system to replace the central processing unit and continue business processing of the information processing system. In a multiplex system that allocates central processing units of other information processing systems, the current system is allowed to have 91 spares if necessary, and the spares can be the current system of its own information processing system, and As a standby for multiple other information processing systems, the working and standby relationships between each central processing unit are determined, and whenever there is a change in the relationship between each central processing unit due to equipment failure, the central processing By changing the combination of working and standby relationships between devices,
A multiplex system control method characterized by always preferentially allocating a spare central processing unit to the central processing unit of the information processing system with the highest degree of importance in the system.