JP3012402B2 - Information processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing system, and more particularly to an information processing system in which a system including a central processing unit, a main storage device, an input / output control unit, and a bus connecting these devices in common is duplicated. .

[0002]

2. Description of the Related Art In such a redundant system, there are the following two methods for performing an operation test between an input / output control device of an online operation system and a main storage device of an online non-operation system.

(1) A method in which input / output is performed from a central processing unit of an online non-operation type to a register in an input / output control unit of an online operation type, and only a bus connection state is confirmed.

(2) Online operation is temporarily suspended,
In response to an instruction from a central processing unit that is not online,
A method in which an input / output control device reads and writes input / output data from / to a main storage device that is not online.

The above method (1) has a disadvantage that the input / output control device of the online operation system becomes a bus master and cannot confirm the data transfer operation to the main storage device of the online non-operation system.

In the above method (2), it is necessary to interrupt and stop the online operation. If a failure such as no response occurs during the test, the online stop time becomes longer, which may lead to a system down. There is a disadvantage that the reliability of the system is reduced.

[0007] In addition, a method of not performing any test is conceivable, but in this case, a device whose normality has not been confirmed is to be incorporated into the system, and if a non-response failure or the like occurs, In addition, there is a disadvantage that the online stop time is prolonged, which may lead to a system down, which also lowers the reliability of the system.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned drawbacks of the prior art, and the object of the present invention is to provide another method without affecting the online operation of its own system. It is an object of the present invention to provide an information processing system capable of performing an interface operation test between a system main storage device and its own system input / output control device.

[0009]

According to the present invention, a first central processing unit,
A first system including a first main storage device, a first input / output device, and a first bus to which these devices are commonly connected, a second central processing unit, a second main storage device, 2 input / output devices,
Each of these devices comprises a second bus commonly connected to a second bus.
An information processing system having a dual configuration, wherein each of the first and second input / output control devices is capable of online access to both main storage devices of its own system and another system. And test means capable of performing test access to both the main storage device of the own system and the main storage device of the other system, respectively, while the main storage device of the other system is accessed by the test means while the online storage device accesses the main storage device of the own system. Make test access to the equipment, and
And each of the second main storage devices has a predetermined diagnostic data.
A diagnostic area in which a diagnostic data is stored, wherein the test means
Read access to the disconnected area
Inverts the diagnostic data that has been written and writes it to the diagnostic area.
An information processing system characterized by being configured to access the information processing system.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of the present embodiment. First
The central processing unit (CPU) 10 of the system includes a main storage device (M
M) 20, an input / output control unit (BIU) 30, and a bus 40. The bus 40 is connected to a second system input / output control device (BIU) 31, and the first system input / output control device 30 is connected to an input / output device (IO) 50.

Similarly, the central processing unit 11 of the second system is commonly connected by a main storage device 21, an input / output control device 31, and a bus 41. The bus 41 is the input / output control device 3 of the first system.
0, and the input / output control device 31 of the second system is connected to the input / output device 51.

Now, the first system will be called the 0 system, and the second system will be called the 1 system. A circuit (ONL) 60 for performing online processing and a test circuit (TEST) 70 for performing a test between the input / output control device 30 and the other system main storage device 21 are provided in the input / output control device 30 of the 0 system. Is provided.
Similarly, a circuit 61 for performing online processing and a test circuit 71 for performing a test between the input / output control device 31 and the other system main storage device 20 are provided in the input / output control device 31 of the first system. .

FIG. 2 is a conceptual diagram showing an access to the main storage from the input / output control device 30 of the system 0 when it is confirmed that all the devices of the system 0 and the system 1 are all normal. FIG. This access operation is called an online operation.

The input / output control device 30 becomes a bus master of the bus 40 and the bus 41 by the function of the circuit 60 for performing the online processing in the input / output control device 30 of the 0 system. Write access is performed to the main storage device 20 and the main storage device 21 of the system, and data is written. Similarly, read access is made to the main storage devices 20 and 21 of both systems via the bus 40 and the bus 41 to read data. As a result, the main memories of both systems always have the same contents.

FIG. 3 is a conceptual diagram showing access from the input / output control device 30 to the main storage device when a system 1 device fails. At this time, the online operation is performed by the input / output controller 3
That is, the access to the main storage device 20 from 0. By the function of the circuit 60 for performing online processing in the input / output control device 30 of the system 0, the input / output control device 30 becomes a bus master of the bus 40 and writes data to the main storage device 20 of the system 0 via the bus 40. Data is being read from the 0-system main storage device 20.

FIG. 4 is a conceptual diagram when a read / write access test is performed on the main storage device 21 of the system 1 while performing on-line processing on the system itself by the input / output control device 30 of the system 0. .

The online transfer data of the main storage device 20 is transmitted and received via the bus 40 by the function of the circuit 60 for performing the online processing in the input / output control device 30 of the 0 system.

At the same time, when a test start instruction is generated, the test circuit 70 in the input / output control device 30 operates in response to the instruction, and the input / output control device 30 becomes a bus master of the bus 41 by its function. Test read / write access to the main storage device 21 of the other system becomes possible.

At this time, a diagnostic area in which diagnostic data is stored is set in the main storage device 21 in advance, and the test circuit 70 performs read access to this diagnostic area. Then, the test circuit 70 similarly performs write access to the diagnostic area in the main storage device 21 to write the inverted data of the diagnostic data.

At this time, the reason why the inverted data of the diagnostic data is written is as follows. That is, since the diagnosis area is secured on the main storage device, it is not allowed to increase the capacity of the diagnosis area. Therefore, the diagnosis data is rewritten (so-called overwritten) to this area. This is because if the stored diagnostic data is inverted and written, it can be determined that the diagnosis has been performed.

With the above processing, a transfer test of diagnostic data can be performed from the input / output control device 30 of the system 0 to the main storage device 21 of the system 1 while performing online processing in the system 0. When the test is completed normally, both systems can shift to a normal operation state as shown in FIG.

[0023]

As described above, according to the present invention, the data transfer test of the other system can be performed in parallel with the on-line processing of the own system, so that a highly reliable duplex system can be realized. This has the effect of becoming

[Brief description of the drawings]

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

FIG. 2 shows the input / output control device 3 of the system 0 when both systems are normal.
FIG. 3 is a conceptual diagram showing an access mode from 0 to the main storage devices 20 and 21.

FIG. 3 is a conceptual diagram showing an access state from the input / output control device 30 to the main storage device 20 when a failure occurs in the first system.

FIG. 4 is a conceptual diagram illustrating a case where a test access is made to a primary system main storage device 21 while an on-line process is performed by a system 0 input / output control device 30;

[Explanation of symbols]

 10, 11 Central processing unit 20, 21 Main storage device 30, 31 I / O control device 40, 41 Bus 50, 51 I / O device 60, 61 Online circuit 70, 71 Test circuit

Claims (1)

(57) [Claims] 1. A first system comprising a first central processing unit, a first main storage device, a first input / output device, a first bus to which these devices are commonly connected, and a second system. Central processing unit,
An information processing system having a duplex configuration including a second main storage device, a second input / output device, and a second system including a second bus to which these devices are commonly connected. Each of the second input / output control devices has online means capable of online access to both main storage devices of the own system and the other system, and test access to both main storage devices of the own system and the other system. Test means, and during access to the main storage device of the own system by the online means,
The test means makes a test access to a main storage device of another system, and the first and second main storage devices are accessed.
Each of the devices is a diagnostic that stores predetermined diagnostic data.
Area, and the test means includes a resource for the diagnostic area.
Read access to the diagnostic data
So that the data can be inverted and write access can be made to the diagnostic area.
An information processing system characterized by being configured.