JPH056345A - System control system - Google Patents

Abstract

PURPOSE:To execute highly reliable system switching control by a comparatively simple hardware without depending upon software easily occurring malfunction. CONSTITUTION:A system informing signal 20 indicating which system uses a module 2 on a shared bus 2-1 to be shared by respective systems with priority to the module 2 is informed a system bus control device 3' for managing the shared bus 2-1. A system identification signal 21 for requesting the setting of an access pass is outputted from each of inter-bus connecting devices 0-5, 1-5, for connecting local buses 0-1, 0-1' in respective systems to the shared bus 2-1 to the device 3'. The device 3' on the shared bus 2-1 executes control for validating only a request from the system with the higher priority based upon the signals 21, 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system control system for controlling a shared bus of a multiplexed computer system.

[0002]

2. Description of the Related Art In order to improve the reliability of a computer system, it has been practiced to provide a plurality of computer systems, one of which is an operating system and the other of which is a standby system. In this case, when the active system has some trouble, the standby system continues the process on behalf of the active system. It should be noted that, in general, even if it is called “duplexing”, duplication is the most general, so duplication will be described below. Figure 2
Fig. 1 shows a block diagram of a duplex system which is a conventional duplicated computer system.

The system shown in the figure comprises two computer systems, a 0-system computer system 00 and a 1-system computer system 11. The 0-system computer system 00 is provided with a central processing unit (CPU) 0-2, through which a system bus control unit (SCTL) 0-3 and an inter-bus connection device (ADP) are connected via a 0-system local bus 0-1. ) 0-4 and 0-5 are connected. Also,
Similarly, the 1-system computer system 11 is also provided with a central processing unit (CPU) 1-2, to which the system bus controller (SCT) is connected via the 1-system local bus 1-1.
L) 1-3 and bus connection device (ADP) 1-4 and 1-
5 is connected.

One of the 0 system computer system 00 and the 1 system computer system 11 is operated as an active system and the other is operated as a standby system. The system monitoring device (SMC) 10 manages which is the active system. A shared bus 2-1 is connected to the two computer systems 00 and 11 via inter-bus connection devices (ADP) 0-5 and 1-5, and the module 2 connected to the shared bus 2-1 is shared. Has been done. The shared bus 2-1 is controlled by the system bus control device (SCTL) 3. Module 2 has a shared channel (CH) 2−
2 is provided, and this channel manages files 2-3.

That is, in this system, the operating computer system occupies the module 2 via the shared bus 2-1 and executes a predetermined process. When a failure occurs in the active system, the active system is switched to the other computer system, and at this stage, the module 2 is occupied by the newly active computer system. At this time, the system bus controller (S
The CTL) 3 receives a request for setting an access path from a computer system which is newly set as an operating system, and performs reserve control thereof. As a result, the module 2 is forcibly released from the computer system that was the active system until immediately before.

FIG. 3 shows a block diagram of a conventional function distribution system. This system comprises a 0-system computer system 00 and a 1-system computer system 11 similar to those shown in FIG. The system configuration is similar to that shown in FIG. It should be noted that this system constitutes a function distribution system in which each computer system shares a predetermined process. Therefore, for example, the 0-system computer system 00 is the main system, and the module 2
The 1-system computer system 11 is configured to operate as a slave system and execute the auxiliary processing of the 0-system computer system 00 while occupying the same to perform a certain process. In such a system as well, the system bus controller (SCTL) 3 sets or reserves the access path of the module 2 as described above.
Control release.

[0007]

In the system as described above, for example, a request for setting an access path of the shared bus 2-1 or an instruction such as reserve or release is issued.
In the case where both computer systems are simultaneously performed, the system bus control unit (SCTL) 3 performs control in consideration of its priority. In this case, the system bus controller (SCTL) 3 needs to determine which system has priority and perform control. That is, in the duplex system shown in FIG. 2, if the standby computer system erroneously issues an access path setting command, the module 2 is disconnected from the active computer system. In this case, the operation of the operating computer system that is actually operating is affected, and in the worst case, the system may be down. The same applies to the function distribution system as shown in FIG.

On the other hand, the system bus controller (SCTL) 3 that manages the shared bus 2-1 receives a request for setting an access path from an active system, a standby system, a main system or a slave system. In this case, it is possible to determine from which system the request is made, but it is impossible to distinguish whether the request is an active system request or a standby system request. That is, the active system and the standby system are always dynamically changed depending on the state of the system, and therefore it is difficult to determine which system has priority based only on the request contents from the system. Also,
Bus connection device 0 provided in each computer system
In -5, 1-5, etc., a system that checks the control right to determine whether the computer system is an active system or a standby system is also conceivable. However, when such a configuration is realized by software, there is a possibility that an erroneous setting may occur, making it difficult to reliably operate the system. The present invention has been made paying attention to the above points, and in a multiplexed computer system such as a duplex system or a function distribution system, it is possible to set an access path from both systems to a shared bus. It is an object of the present invention to provide a highly reliable system control system that automatically gives priority to a command of a system having a control right when there is a command.

[0009]

According to the system control system of the present invention, local buses provided in computer systems of a plurality of systems are connected to a shared bus via inter-bus connection devices, and the respective systems are connected to each other. In a system that shares modules on a shared bus, a system notification signal indicating which system of the systems preferentially uses the module,
While notifying the system bus control device that manages the shared bus, there is a request from any system via the inter-bus connection device to the system control device to set an access path of a module on the shared bus. At this time, the system control device determines whether to set the access path based on a system identification signal output from the inter-bus connection device and a system notification signal output from the system monitoring device. It is a feature.

[0010]

This system is a system bus control device for managing a shared bus to a module on a shared bus shared by each system, with a system notification signal indicating which system preferentially uses the module. To notify. Further, a system identification signal for making an access path setting request is output from the inter-bus connecting device that connects the local bus and the shared bus of each system to the system bus control device. The system bus control device performs control for validating only the request of the system having a high priority based on the system identification signal and the system notification signal. As a result, it is possible to perform highly reliable switching control of the system with relatively simple hardware without relying on software or the like that is prone to malfunction.

[0011]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing an embodiment of a system control system of the present invention. The system shown in the figure is a duplex system including a 0-system computer system 00 and a 1-system computer system 11, and constitutes the duplex system described in FIG. The 0-system computer system 00 includes a central processing unit (CPU) 0-2, and a system bus control unit (SCTL) 0-3 connected to the 0-system local bus 0-1 and inter-bus connections. Devices (ADP) 0-4 and 0-5 'are provided. This configuration is similar to that of the 0-system computer system 00 already described in FIG.

Similarly, for the 1-system computer system 11, a central processing unit (CPU) 1-2, a system bus control unit (SCTL) 1-3, and a bus connection device (AD).
P) 1-4 and 1-5 'are the 1-system local buses 1 respectively
It is configured to be connected via -2. The 0-system computer system 00 and the 1-system computer system 11 are connected to the module 2 via the shared bus 2-1 and share the module 2. The shared bus 2-1 is a system bus controller (S
CTL) 3 '. Also, module 2
Has a shared channel (CH) 2-2 and a file 2-3 controlled by it.

The block configuration up to this point is almost the same as that of the conventional duplex system described in FIG. In the system of the present invention, the system monitoring device (SMC) 10 'is a 0-system computer system 0.
0 system bus controller (SCTL) 0-3
Further, for the system bus control device (SCTL) 1-3 that constitutes the 1-system computer system and the system bus control device (SCTL) 3 ′ that controls the shared bus 2-1:
It is configured to output the system notification signal 20. Also,
From the bus connection device (ADP) 0-5 'or 1-5' provided in each computer system, the shared bus 2-
The system identification signal 21 is output to the system bus control unit (SCTL) 3'which controls the control unit 1.

The system notification signal 20 is a signal indicating which system preferentially uses the module 2. For example, when the 0-system computer system 00 is operating as an active system, It is a signal indicating that the system computer system 00 preferentially uses the module 2. This is a system bus controller (SCTL) that controls the shared bus 2-1 as well as the 0-system computer system 00 and the 1-system computer system 11.
It is a feature of the present invention that it is also supplied to 3 '.

FIG. 4 is an explanatory view of signal paths of the system notification signal and the system identification signal according to the present invention. As shown in the figure, for example, the system monitoring device (SMC) 10 'includes a switch 10
-1 and a buffer 10-2 are provided. When the switch 10-1 is turned off, the system notification signal 20 indicating that the 0 system is the active system is output. When the switch 10-1 is turned on, the system notification signal 20 indicating that the 1-system is the active system is output. This system notification signal 20 includes 0 system SCTL0-3 and 1 system SCTL1-3, shared SCTL3 ', shared SC.
Supplied to TL3A. The shared SCTL 3A indicates a system bus control device for another shared bus, which is not shown in FIG. 1, for example, when a plurality of shared buses are provided.

As described above, in the system of the present invention,
System bus controller (SCTL) that controls the shared bus
A system notification signal 20 for determining which system is the active system is input to 3 '. Further, as shown in the figure, the inter-bus connecting device 0- connected to the 0-system local bus 0-1.
From 5 ', when requesting an access path, a system identification signal 21 for identifying the system is output. A similar system identification signal 21 is also output from the inter-bus connecting device 1-5 ′ connected to the 1-system local bus 1-1. This is input to the system bus control unit (SCTL) 3'for the shared bus, and the control right is determined in consideration of the contents of the system notification signal 20. That is, for example, when the system notification signal 20 indicating that the 0 system is the active system is input, the access path setting request input via the interbus connection device 0-5 'is permitted, but the interbus connection is performed. The operation of rejecting the access path setting request input via the device 1-5 'is performed.

FIG. 5 shows a specific operation flowchart of the system of the present invention. The device shown in FIG. 1 specifically operates as in this flowchart. First, 0
In step S1, the setting instruction of the CPU 0-2 is input to the system bus control device 3'of the shared bus from the inter-bus connection device 0-5 'of the system. Similarly, the setting command of the CPU 1-2 is input to the system bus control device 3'of the shared bus from the 1-system inter-bus connecting device 1-5 '(step S2). The data format of this setting command is referred to as data format A, and its contents will be described with reference to FIG.

FIG. 6 shows a data format explanatory diagram.
FIG. 6A shows the contents of this data format A.
This data is composed of an inter-bus connection device module number 31, a shared channel module number 32, and setting information 33. Bus connection device module number 31
This corresponds to the system identification signal described above. The shared channel module number 32 specifies the number of the module connected to the shared bus 2-1. The setting information 33 is
It is composed of an instruction that distinguishes whether to reserve or release the specified module. When such a setting command is accepted by the system bus control device 3'of the shared bus, the system identification signal is determined in step S3 of FIG. If the system identification signal is odd, it is determined that this setting command is output from the 0 system, and if it is even, it is determined that it is output from the 1 system. This instruction is 0
If it is output from the system, move to step S4,
The system notification signal is determined.

The content of the system notification signal is 0 as shown in FIG.
If so, system 0 is the active system, and if system 1 is the active system. 0
If the system is determined to be the active system, the process proceeds to step S5 and C
The PU0-2 setting instructions are executed. If the 1-system is determined to be the active system, this setting command cannot be accepted. That is, the processing is ended as it is. CPU0 in step S5
When the setting command of -2 is executed, a completion report is created in step S6 and the data format B is used to report to the 0-system inter-bus connecting device. The 0-system bus-to-bus connecting device accepts this report and advances the subsequent processing. FIG. 6B shows the data format B as described above. That is, this data format has substantially the same contents as the data format A, and the inter-bus connecting device module number 41 (system identification signal), the shared channel module number 42, and the setting information 43 after the setting is permitted.
Consists of.

On the other hand, in step S3 of FIG. 5, when it is determined that the system that issued the setting command is the 1-system, the process proceeds to step S7 and the system notification signal is determined. When the system notification signal has the content that the 1st system is the active system, the process proceeds to step S8 and the setting command of the CPU 1-2 is executed. After that, in step S9, the completion report according to the data format B described above is performed, and when the 1-system bus-to-bus connecting device receives the completion report in step S10, the process ends. Note that step S7
If it is determined that the 0-system is the active system, the setting command is not accepted and the process is terminated.

As described above, the system bus controller (SCTL) 3'for controlling the shared bus receives the system notification signal 20 and the system identification signal 20, and the command source is the active system or the standby system. It is sufficient to judge whether or not the control right is checked, and the control becomes very simple.

The present invention is not limited to the above embodiments. The above embodiment shows an example in which the present invention is applied to a duplex system. However, similar processing can be performed for the function distribution system. In this case, the system monitoring device (SMC) 10 'does not exist. Therefore, as shown in FIG. 4, for example, an optional circuit surrounded by a broken line for generating the system notification signal 20 is provided in the 0 system SCTL0-3. In this case, the switches 10-1 'and 10-2' are provided in the 0-system SCTL0-3. Note that the switch 10-3 is the switch 1 when the system monitoring device (SMC) 10 is provided.
Used to disconnect 0-1. In this way
In the function distribution system, the system notification signal 20 has a content for indicating which is the main system and which is the slave system. Further, of course, the same effect can be obtained not only when the computer systems are duplicated but also when they are multiplexed.

[0023]

According to the system control system of the present invention described above, the system notification signal indicating to which system preferentially uses the module is sent to the system bus control device for controlling the shared bus by the system monitoring device or the like. The system connection signal is output to the system bus control device from the inter-bus connection device, and the system identification signal that identifies the system that made the access path setting request is output to the system bus control device. Then, it is possible to immediately set the access path only to the system having a high priority without error. As a result, it is possible to prevent an erroneous operation in which the operating system module is accidentally disconnected and connected to the standby system, and it is possible to realize a highly reliable system. Therefore, in a duplex system or a function distribution system, highly reliable switching control can be performed with minimum control.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a system control system of the present invention.

FIG. 2 is a block diagram of a conventional duplex system.

FIG. 3 is a block diagram of a conventional function distribution system.

FIG. 4 is an explanatory diagram of signal paths of a system notification signal and a system identification signal according to the present invention.

FIG. 5 is an operation flowchart of the system of the present invention.

FIG. 6 is an explanatory diagram of a data format.

[Explanation of symbols]

00 system computer system 11 system computer system 0-2, 1-2 central processing unit (CPU) 0-3, 1-3 system bus controller (SCTL) 0-4, 0-5, 1-4, 1 -5 Bus connection device (A
DP) 0-10 system local bus 1-1 1 system local bus 2-1 shared bus 2 module 2-2 shared channel (CH) 2-3 file 3 shared bus system bus controller (SCTL) 10 system monitoring device (SMC) 20 system notification signal 21 system identification signal

Claims (1)

Claim: What is claimed is: 1. A local bus provided in a computer system of a plurality of systems is connected to a shared bus via an inter-bus connection device, and each system connects modules on the shared bus. In the shared system, a system notification signal indicating which system of the systems preferentially uses the module is notified to the system bus control device that manages the shared bus. When there is a request for setting an access path of a module on the shared bus to the system control device via the inter-bus connection device, the system control device outputs a system identification signal output from the inter-bus connection device. And a system control system which determines whether or not to set the access path based on a system notification signal output from the system monitoring device.