JPH052546A - Computer device - Google Patents

Abstract

PURPOSE:To attain the continuous operation of this computer device and to improve its reliability by arranging respective host computers and communication control devices by dual constitution and settling an information exchange system for the dual constitution. CONSTITUTION:The host computers Ha, Hb and the communication control devices Ca, Cb are connected based upon dual constitution and the information exchanging system of the dual constitution is settled so that even if one system is failed, continuous operation is attained by the other system. Namely when one of the devices Ca, Cb is failed, information transmitting means L0, L2, L4 are used for information exchange and information transmitting means L1, L3 are turned to unlinked states. When one of the host computers Ha, Hb is failed, the means L3 is used for information exchange, the means L4 is held at a linked state and the means L0 to L2 are controlled to unlinked states. Thereby even when one of host computers or communication control devices runs down, continuous operation can be attained and the reliability of the system can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in a computer system constructed using a LAN. In particular, it relates to an information exchange means by a LAN between the host computer and the communication control device.

[0002]

2. Description of the Related Art In a conventional example, as shown in FIG. 3, a host computer or communication control device connected to a LAN controls communication with a single-configuration host computer H, a single-configuration communication control device C, and a host computer H. A transmission line L connecting with the device C is provided. Further, as shown in FIG. 4, the transmission line L is constituted only by the information transmission means L0 for logically connecting the host computer H and the communication control device C to exchange information.

[0003]

As described above, the conventional example is as follows.
The host computer or the communication control device connected to the LAN has a single configuration, and the host computer down or the communication control device down has a drawback that the system is down or the system is seriously impaired and the reliability is lowered.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a computer system having means for realizing continuous operation and improving reliability.

[0005]

The present invention is a computer device comprising a host computer and a communication control device, which are connected to each other via a LAN, wherein the host computer and the communication control device each have a dual configuration. The LAN logically connects the host computers to each other to exchange information, and one of the host computers and one of the communication control devices is logically connected to exchange information. Second information transmitting means, third information transmitting means for logically connecting one of the host computers and the other of the communication control devices to exchange information, and the other of the host computer and the communication control device. Fourth information transmission means for logically connecting one to exchange information, the other of the host computer and the other of the communication control device And a fifth information transmitting means for exchanging information logically connected to each other, and in normal times, the first, second and fourth information transmitting means are used for information exchange, and the third and fifth information transmitting means. Means for maintaining the link established state, when a failure occurs in the other of the communication control device, using the first, second and fourth information transmission means for information exchange,
When the third and fifth information transmission means are in the link released state and a failure occurs in one of the communication control devices,
When the first, third and fifth information transmission means are used for information exchange, the second and fourth information transmission means are in the link released state, and when the other of the host computers fails, the second Use information transmission means for information exchange,
The third information transmission means is kept in the link established state, the first, fourth and fifth information transmission means are set in the link released state, and when one of the host computers fails, the fourth information transmission means is activated. It is characterized in that it is provided with a control means which is used for information exchange and keeps the fifth information transmitting means in a link established state and puts the first, second and third information transmitting means in a link released state.

[0006]

When the host computer or the communication control device connected to the LAN has a single configuration, the down of the device causes the system down or seriously affects the system. In the present invention, however, the host computer and the communication control device are controlled. By establishing a dual configuration of the device and establishing a dual configuration information exchange system, continuous operation is realized in the other system even if one system fails. That is, in a normal state, the information transmission means L0, L1 and L3 are used for information exchange, the information transmission means L2 and L4 are kept in the link established state, and when the other side of the communication control device fails, the information transmission means L
0, L1 and L3 are used for information exchange, the information transmission means L2 and L4 are set to the link release state, and when one of the communication control devices fails, the information transmission means L0, L2.
And L4 are used for information exchange, the information transmission means L1 and L3 are set to the link released state, and when a failure occurs in the other host computer, the information transmission means L1 is used for information exchange and the information transmission means L2 is linked. In the established state, the information transmission means L0, L3 and L4 are in the link released state, and when one of the host computers fails, the information transmission means L3 is used for information exchange and the information transmission means L4 is in the link established state. And the information transmission means L0,
The L1 and L2 are controlled to be in the link release state.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a connection diagram of a dual-configuration host computer and a dual-configuration communication control device according to the present invention. A dual-configuration host computer (master) Ha
And a host computer (slave) Hb, a dual configuration communication control device (master) Ca and a communication control device (slave) Cb, and input data from a line is distributed to the communication control devices Ca and Cb as the same data, and communication is performed. A line data distribution device that outputs the output data from the control device Ca or Cb to the line, and a transmission line L that connects the dual configuration host computer and the dual configuration communication control device are provided. Here, as shown in FIG. 2, the transmission path L includes an information transmission means L0 for logically connecting the host computer Ha and the host computer Hb to exchange information, and a logical connection between the host computer Ha and the communication control device Ca. Information transmission means L1 for physically connecting and exchanging information,
Information transmission means L2 for logically connecting the host computer Ha and the communication control device Cb to exchange information, and information transmission means L3 for logically connecting the host computer Hb and the communication control device Ca to exchange information. Also, the host computer Hb and the communication control device Cb are logically connected to each other, and information transmission means L4 for exchanging information is provided.

As shown in FIG. 2, this embodiment includes dual-structure host computers Ha and Hb, communication control devices Ca and Cb, and a LAN.
Information transmission means L0 for logically connecting the host computers Ha and Hb and exchanging information, logically connecting the host computer Ha and the communication control device Ca,
An information transmission means L1 for exchanging information, an information transmission means L2 for logically connecting the host computer Ha and the communication control device Cb, and exchanging information, and a host computer Hb.
And a communication control device Ca, and information transmission means L3 for exchanging information, and an information transmission means L4 for logically connecting the host computer Hb and the communication control device Cb and exchanging information. , At the normal time, the information transmission means L0,
L1 and L3 are used for information exchange, and information transmission means L2
And L4 are kept in the link established state, and the communication control device Cb
When a failure occurs in the information transmission means, the information transmission means L0, L1 and L3 are used for information exchange, and the information transmission means L2 and L3 are used.
4 in the link release state, and when a failure occurs in the communication control device Ca, the information transmission means L0, L2 and L4 are used for information exchange, the information transmission means L1 and L3 are set in the link release state, and the host computer Hb When a failure occurs, the information transmitting means L1 is used for information exchange, the information transmitting means L2 is kept in the link established state, and the information transmitting means L is used.
0, L3 and L4 are in the link released state, and when a failure occurs in the host computer Ha, the information transmission means L
3 is used for information exchange, the information transmission means L4 is kept in the link established state, and the information transmission means L0, L1 and L2 are provided in the link released state.

Next, the operation of this embodiment will be described with reference to FIGS.
Will be described. Here, the information transmission means indicated by the solid line indicates that a link has been established and information has been exchanged, and the information transmission means indicated by the broken line indicates that a link has been established but information has not been exchanged. .. FIG. 5 shows a normal operation of information exchange between the host computer and the communication control device.
Links are established in all of the information transmission means L0, L1, L2, L3 and L4. Information transmission means L1 and L3
Is used to exchange information between the host computers Ha and Hb and the master communication control device Ca. The information transmission means L0 is used for exchanging information for data matching between the host computer Ha and the host computer Hb. Information is not exchanged in the information transmitting means L2 and L4, but a link has already been established, and when the master communication control device Ca goes down, the slave communication control device Cb is immediately set as the master system and information is transmitted. The means L2 and L4 are used to enable the exchange of information.

FIG. 6 shows the exchange of information during normal operation (FIG. 5) when the slave communication control device Cb is down. In this case, the links of the information transmitting means L2 and L4, which have established the link with the communication control device Cb, are released, but the information transmitting means L0, L1 and L3 continue to establish the link, and in normal operation. Operation can be continued from (Fig. 5).

FIG. 7 shows the exchange of information when the master communication control device Ca is down during normal operation (FIG. 5). In this case, the links of the information transmission means L1 and L3 used for exchanging information between the host computer and the communication control device are released. Then, the master communication control device C
Information exchange is performed using the already linked information transmission means L2, L4, and L0 between the communication control device Cb, which has become a new master from the slave due to a down, and the host computers Ha and Hb. In this way, even if the master-system communication control device Ca goes down, it is possible to continue operation immediately.

FIG. 8 shows the exchange of information when the slave host computer Hb goes down during normal operation (FIG. 5). In this case, the links of the information transmission means L0, L3, and L4, which have established the link with the host computer Hb, are released, but the links of the information transmission means L1 and L2 are continuously established, so that the normal operation is performed. The operation can be continued from the time (Fig. 5).

FIG. 9 shows information exchange when the master system host computer Ha is down during normal operation (FIG. 5). In this case, the information transmission means L0 used for exchanging information between the host computer and the communication control device,
The L1 and L2 links are released. Then, due to the master system host computer Ha being down, information is exchanged using the information transmission means L3 for which the link has already been established between the host computer Hb that has become a new master from the slave and the communication control devices Ca and Cb. In this way, even if the master host computer Ha goes down, it is possible to prevent the system from going down and enable continuous operation promptly.

[0014]

As described above, the present invention provides a LAN.
By changing the host computer and communication control device connected to the single configuration from dual configuration to establishing a dual configuration information exchange method, even if the host computer or communication control device of one system goes down, continuous operation or prompt slave operation is possible. It has the effect of improving reliability by realizing continuous operation after switching from the master system to the master system.

[Brief description of drawings]

FIG. 1 is a connection diagram of a host computer of the present invention and a communication control device.

FIG. 2 is a diagram showing information transmission means between a host computer and a communication control device according to the present invention.

FIG. 3 is a connection diagram of a conventional host computer and a communication control device.

FIG. 4 is a diagram showing a conventional information transmission means between a host computer and a communication control device.

FIG. 5 is a diagram showing an information exchange situation under normal conditions.

FIG. 6 is a diagram showing a status of information exchange when the old slave communication control device is down.

FIG. 7 is a diagram showing an information exchange status when the old master communication control device is down.

FIG. 8 is a diagram showing an information exchange status when an old slave host computer is down.

FIG. 9 is a diagram showing the information exchange status when the old master host computer is down.

[Explanation of symbols]

 Ca, Cb Communication control device Ha, Hb Host computer L0, L1, L2, L3, L4 Information transmission means

Claims (1)

Claim: What is claimed is: 1. A computer device comprising a host computer and a communication control device connected to each other via a LAN, wherein the host computer and the communication control device each have a dual configuration, and the LAN A first information transmission means for logically connecting the host computers to each other and exchanging information; and a logical connection between one of the host computers and one of the communication control devices to exchange information. Two information transmission means, logically connecting one of the host computer and the other of the communication control device,
Third information transmitting means for exchanging information, fourth information transmitting means for exchanging information by logically connecting the other of the host computer and one of the communication control devices, and the other of the host computer and the communication A fifth information transmission means for logically connecting the other of the control devices and exchanging information is provided, and the first, second and fourth information transmission means are used for information exchange under normal conditions, and the third information transmission means is used. And the fifth information transmitting means is kept in a link established state, and when the other of the communication control devices fails, the first, second and fourth information transmitting means are used for information exchange, and the third and When the fifth information transmission means is in the link released state and one of the communication control devices fails, the first, third and fifth information transmission means are used for information exchange, and the second and fourth information transmission means are used. Link information transmission means When the other side of the host computer is released, the second information transmission means is used for information exchange, the third information transmission means is kept in the link established state, and the first, fourth and When the fifth information transmitting means is in the link released state and one of the host computers has a failure, the fourth information transmitting means is used for information exchange, and the fifth information transmitting means is kept in the link established state, A computer apparatus comprising a control means for putting the first, second and third information transmission means into a link released state.