JPS58107965A - System constituting system - Google Patents

Abstract

PURPOSE:To attain switching control stepwise and easily without notifying the state of an alternative device, by classfying devices by level and determining the permissible number of times for system changeover corresponding to each level, in the system constitution to be switched to a spare system when a failure is generated. CONSTITUTION:Plural devices in a system are classified by level in the order of high commonness, the number of times of permission of system changeover is determined corresponding to each level and the system changeover is done within the range of the number of permissible time. That is, a data indexed corresponding to each level to be inputted is stored in a storage device MEM, the level L1 indicates that it is permissible with the content of a counter CNT for once, i.e., 0 time, the level L2 indicates the permission that it is permissible with the number of times less than twice, i.e., once, and the level L3 is permissible for the number less than 3 times, i.e., twice and below. In permitting the system switching, the counter CNT is advanced by +1 step and a switch changeover order is outputted to a switch control circuit SWCTL.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to system switching in the event of a failure in a redundant system configuration, and in particular to system switching in the event of a failure in a redundant system configuration, and in particular to system switching in the event of a failure in a redundant system configuration, and in particular to system switching in the event of a failure in a redundant system configuration. This relates to a method for configuring a system according to its level.

(2) Background of the technology In general, information exchange and information processing systems such as switchboards and teller machines are duplexed in order to cope with failures (or when various failures (failures) occur in multiple devices, conventional technology The degree of functional decline in the entire system that would occur if the faulty (faulty) device was continued to be used, and the decline in the overall system functionality that would occur if the faulty device was replaced (if the substitute device has the same capabilities as the faulty device, If there is no, there is no functional decline.

), and select the device with the lowest degree. However, it is complicated to be aware of the status of the alternative device (not necessarily one device), and the device selection, switching control, etc. It's complicated.

(4) Purpose of the Invention The purpose of the present invention is to solve the above problems by easily controlling switching in stages in response to failures in each component of the system without being aware of the status of the substitute device. The purpose of this invention is to provide a system configuration reconfiguration method.

(5) Structure of the Invention In order to achieve the above object, the present invention consists of a working (current) system and a backup system, and when a failure occurs in a device in the working (current) system, the system is switched to the backup system. In the system configuration, a plurality of devices in the system are divided into levels in order of increasing commonality, a permissible number of system switching is determined for each level, and system switching is performed within the range of the permissible number of times.

(6) Examples of the invention The present invention will be explained in detail below using examples.

FIG. 1 is a system configuration diagram as an embodiment of the system configuration method of the present invention. In the figure, EXo, EX
, is a duplex exchange, and the CPU is the exchange Ex0. E
8WCTL is a central processing unit that controls the Xl, MEM is a storage device that stores call control information necessary for switching operations, data for system operation, etc., and 8WCTL is an exchange that connects to the exchange and has duplicated lines. This is a changeover switch control unit that selectively switches connections. Duplex exchange gx
,.

Each EX has the same configuration, and the MA that connects the lines is configured in multiple stages (two stages in this example) to form the network NWo.
It is connected to the. The network NWo is driven and controlled by a central processing unit (CPU) via a communication path control circuit 5PCo. Each multiplexer MPXo and demultiplexer DMPXp network NW is equipped with a monitoring circuit ξ for failure detection (the network NWo is monitored via a communication path control circuit), and a central processing unit C
The PU is configured to detect failure processing through the monitoring circuits 01 to C6, issue a system switching command to the switch control circuit 5WCTL, and drive the selector switch SWl of the switch control circuit 8WCTL. The first stage on the line side concentrates 128 lines, and the second stage controls 2 lines.
It is configured to condense 56 lines.

FIG. 2 is an explanatory diagram illustrating the system configuration method of the present invention in the system configuration of FIG. 1.

3- 9) to 9) in Figure 2 show the stepwise switching when a system internal pressure failure occurs in one system, and both systems 0 and 1 in the figure are shown in a simplified manner. . For example, the first
The first stage of the line side of the configuration equipment shown in the figure? A/Ciplexer MPXo, DMPX, A1゜A, , B, ,
B, second stage multi-mezzo multiplexer Ml)X,
, DMPX, is CA, CB, and network NWo is D
It corresponds to Other devices f, etc. Here, for example, it can be seen that the device A1 has become an obstacle.Ct (see Figure 1)
When the central processing unit detects this, it updates the counter CNT and switches from the KO system to the 1st thread (b) as shown in the figure. Next, when a failure occurs in device C'B in the 1 system, which is the ACT in use, the central processing unit CPU detects this failure via the monitoring 1al path Co' (Fig. 1), updates the counter, and starts from the 1st thread. Switch the system to Q system (c)
As shown in the figure <14! move. Furthermore, if device 1) becomes a failure in the 0 system that is the ACT in use, the failure is handled by the communication path control device 4.
- (FIG. 1), the central processing unit CPU detects and updates the counter CNT in the same manner as the previous transition and switches the system from the O system to the 1 system. Therefore, the switching control of the system configuration according to the present invention is based on the hierarchical division of each device and the control method using the counter CNT. In FIG. 2, devices A, , A, , B1
,B, are all at the same level, and each A,,A,,B,
, , B remain within the control range of their respective devices.

Similarly, devices CA and CB are at the same level, and each device has the lower level within its own control range.

Furthermore, the equipment affects the configuration itself of each group,
This means that the system in question is unusable due to a failure in this equipment. In other words, the present invention maintains a level in the devices that are each component of this system configuration, and the level where the commonality increases in the order of A (B) → C-) D (the importance of the device increases) and the occurrence of a failure. The system is switched depending on the number of times the system is switched (the value of the count CNT). The specific control configuration will be revealed later, but in Fig. 2, A,,A! , B, ,B, is at level L1, CA, CB are at level L, and D is at level L3. First, Karan, 5CNT is 11
0'' (state (()) indicates that any device at level L2 or level L, that is, any one of CA, Cn, or D, has a failure, the system is switched to A CT -) 8 B Y. , level L1 AI ,4 ,J ,
Any failure to do so will be ignored. Furthermore, counter CNT
The system configuration can only be switched when D is 2'' (state (c)>h level L8).

That is, the present invention is based on the idea that as the number of system switching increases, upper level control is maintained by ignoring lower level failures. It should be noted that the shaded area in the device shown in FIG. 2 is a failure, and that the counter CNT is initialized when failure recovery measures are taken at 8BY during standby and the system returns to normal.

FIG. 3 is a block diagram of a specific system configuration method of the present invention. Third
The figure shows the storage device MBM, central processing unit, and IC in Figure 1)
' Only the part of U related to the present invention is shown, and R1 is a register that controls the power (R1 is a permissible switch (
b) A register that stores a number, cNT is a counter that holds the number of system switching times, and CMP is a comparator. In the storage device MBM, data is indexed corresponding to each input level. In this embodiment, level L weight is acceptable if the content of the counter CNT is less than 1 time, that is, 0 times, and level L! Level Lat'i is acceptable if it is less than 2 concavities, that is, 1 time or less, and level Lat'i is less than 3 times, that is, 2
This is an example showing that it is acceptable to use less than 3 times. If system switching is acceptable, the counter CNT is incremented by +1, and
Control is passed to the order editing section J□ to issue a switch change order (command) to the switch control circuit 8WCTL. If system switching is not permitted, processing continues with the same system configuration.

4 to 6 show examples of system application of the present invention.

FIG. 4 shows an example in which the standby device has smaller functions from the beginning than the device in use, whereas the embodiment shown in FIG. 1 is completely duplex. In this case, if the currently used devices A, At, which are not among the standby devices, become a failure, the devices will not be switched.

FIG. 5 shows an example in which there is one selection device and a plurality of active devices. In this case, it is efficient to provide a number of switching frequency meters that are an integral multiple of the number of paired active devices, but they may be provided for each of a plurality of paired active devices.

FIG. 6 shows an example in which there is one device in use and a plurality of standby devices, and it is only necessary to monitor the status of the device in use as well as the selected device.

Further, FIG. 7 shows an example of an information processing system.

The example shown above is the exchange EXOEX in an exchange system.
, but in this example shown in FIG. 7, the input/output device I10 is connected to the input/output control device I
Each channel CH and subchannel SCH of the input/output control device IOC are duplicated. Monitoring circuits 0 to C detect failures in each device and notify the central processing unit CPU. In this case, with a two-stage configuration of subchannel 5CL (and channel CH), two-level control is performed instead of level L shown in FIG.
8-, the control system will be explained in the same way below, so detailed explanation will be omitted.

(7) As described in detail, according to the present invention, when a failure occurs in a device in use, the system configuration can be selected depending on the degree of tolerance of the failure, and the device in use, on standby, Alternatively, the functional deterioration of the entire system can be minimized without being aware of the state of the system.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram as an example of the system configuration method of the present invention, FIG. 2 is an explanatory diagram of each state (a) to ← of the system configuration example of the present invention, and FIG. 3 is a specific diagram of the present invention. FIG. 4, FIG. 5, and FIG. 6 are application examples of the system configuration, and FIG. 7 is a system configuration diagram of another embodiment. CPU: Central processing unit MEM: Storage device ~L, Nilevel

Claims (1)

[Claims] In a system configuration that consists of a working (active) system and a standby system, and when a failure occurs in a device in the working (active) system, the system is switched to the standby system, and the commonality of multiple devices in the system is high. A system configuration method characterized in that systems are divided into levels in order, a permissible number of system switching is determined for each level, and system switching is performed within the range of the permissible number of times.