JPS6282839A - Backup system for plural terminals - Google Patents

Abstract

PURPOSE:To back up simply terminals even if a fualt is generated in a terminal having a function as a cluster controller by forming a cluster controller fault detecting means and a switching means in an optional terminal. CONSTITUTION:A personal computer 6 is an optionally selected terminal and is provided with a means for detecting the generation of a fault in a terminal having a cluster controller function and a switching means. Namely, the personal computer 6 decides whether a fault is generated or not in a personal computer 5 ordinarily acting as a terminal through a small-sized LAN and having a function as a cluster controller. If a fault is generated in the computer 5, the computer 6 sends a switching signal to switch a switch box 4 and connects a communication line to a self-interface RS 232C. Consequently, the computer 6 fulfills both functions as the cluster controller and the terminal, so that even if a fault is generated in the computer 5, the computer 5 can be simply backed up.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a backup method for multiple terminals, and more particularly, to a backup method for multiple terminals that can be easily backed up in the event of a failure in a personal computer LAN system connected to a host computer. It is.

Conventional technology Recently, LAN (Local Ar1a Network
rk) is becoming more and more popular. There are various types of LANs depending on their scale, from LANs that connect personal computers to LANs that connect entire factories.

As shown in Figure 3, small-scale 1. There is a method of realizing multiple terminals of a host computer from a single communication line by using a group of personal computers connected by , AN. That is, the host 1 to computer 1 is connected to a personal computer (A) 5 via a communication line via modems 2 and 3, and a small-scale network is connected via the personal computer (A) 5 equipped with the function of a cluster controller. and sends signals to each terminal 6, 7 . of the personal computers (B) (C) (D) that constitute the LAN.
8. In this method, the personal computer (A) 5, which functions as both a cluster controller 1 and a terminal, performs both the transmission and reception from the host computer 1 via the interface (R8232C) and the main control of the small-scale LAN. It is a considerable burden due to the movement. If a failure occurs in this personal computer (A) 5, all personal computers 6.7 connected to this personal computer (A) 5 through the small-scale LAN
．． 8 no longer works as a terminal. That is,
When realizing distributed terminals of the host computer 1 through a single communication line, there is a problem in that when the cluster controller 1 to roller fails, backup cannot be performed unless another cluster controller is used.

Purpose The purpose of the present invention is to improve such conventional problems, and to provide a system in which a single personal computer is equipped with the function of a controller, and even if a failure occurs in this personal computer, it can be easily backed up. The purpose is to provide a backup method for multiple terminals.

Configuration In order to achieve the above object, the multiple backup method according to the present invention connects multiple computers connected to a small-scale LAN via a communication line and a terminal that functions as a cluster controller. Therefore, in a system used as multiple host computer terminals, any computer among the +yL number of terminals is equipped with cluster controller failure detection means and switch switching means, and when a failure occurs in the terminal functioning as the cluster controller. , the above-mentioned arbitrary terminal detects the failure, switches the communication line, and backs up the function of the cluster controller.

Hereinafter, the configuration of the present invention will be explained in detail by way of examples.

FIG. 1 is a functional configuration diagram of a multiple terminal backup system showing an embodiment of the present invention. In this embodiment, one terminal among a plurality of terminals (computer 6 in 22) has an E! When the terminal detects a failure, it backs up by switching the switch and making the terminal function as a cluster controller 1-roller.In Figure 1, 4 is a switch box, and the other symbols are in Figure 3 The system configuration is such that a modem 3 is connected to both a personal computer (A) 5 and a personal computer (B) 6 via a switch box 4, and the switch is controlled by the computer 6. Normally, the switch 4 is connected to the personal computer (A) 5, which is the original cluster controller, and the personal computer (B) 6 operates as a general terminal. When a failure in A) 5 is detected, a switch switching signal is sent and the switch 4 is switched to the personal computer (B) 6, changing the function from terminal function only to cluster controller and terminal function (3). fulfill.

That is, in this embodiment, by simply providing the switch box 4, backup is possible in the event of a failure of the cluster controller.

In FIG. 1, the terminal equipped with the failure detection function is the personal computer (B) 6, but it is not limited to this.
Other terminals may also have this functionality.

For example, if the personal computer (C) 7 is equipped with this function, the computer 7 detects that a failure has occurred in the personal computer (A) 5, which functions as both a cluster controller and a terminal, and sends a switch changeover signal. switch, reconnect the communication line to the interface (R3232C) of personal computer (C) 7, and then connect the communication line to the interface (R3232C) of personal computer (C)
) 7 to function as both a cluster controller and a terminal. In this case, the personal computer (
A) 5 can be made completely unusable or if only the interface is found to be faulty.

Make it work only as a terminal. In this way, even if a failure occurs and the terminal goes down, it can be immediately restored.

Figure 2 shows the personal computer (B) in Figure 1.
) is a flowchart showing the processing. Jomichi operates as a terminal via the small-scale LAN (step 101
). Then, it is determined whether or not a failure has occurred in the personal computer [A3B] that always plays the role of the cluster controller (step 102), and if no failure has occurred, the process is terminated (step 103). If a failure occurs, the switch is changed to connect one communication line to its own interface (R5232C) (step 104). The cluster controller 1 is made to function as both a roller and a terminal (step 105).

Next, it is confirmed whether or not the switching has been completed, and the process is ended (step 106).

Since personal computers for ordinary business use are equipped with an R8232C interface as standard, a backup system for a LAN terminal system of a host computer can be easily realized at low cost.

Effects As explained above, according to the present invention,
A terminal is provided that has the function of an AN terminal, but functions as both a backup cluster controller and a terminal only when the cluster controller fails, and that terminal detects the failure of the cluster controller and switches the switch. Since it is connected, backup in case of failure is easily possible.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram of a backup method for multiple terminals showing an embodiment of the present invention, Fig. 2 is a processing flowchart in Fig. 1, and Fig. 3 is a functional block diagram of a conventional backup method.61: Host computer, 2,3
: Modem, 4: Switch box, 5: Cluster controller. Personal computer that also serves as a terminal; 6: Personal computer that serves as a cluster controller and terminal only in the event of a failure; 7.8: LAN terminal; 9; LAN common cable. Figure 1 Figure 2

Claims (1)

[Claims] (1) In a system that is used as multiple terminals of a host computer by connecting multiple computers connected to a small-scale LAN via a communication line and a terminal that functions as a cluster controller, one of the multiple terminals is equipped with cluster controller failure detection means and switch switching means in any computer of the above, and when a failure occurs in a terminal functioning as a cluster controller, said arbitrary terminal detects the failure and switches the communication line; A backup method for multiple terminals that is characterized by backing up the functions of the cluster controller.