JP2778408B2 - Management device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a management apparatus for managing the operation of, for example, a new transportation system.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a schematic configuration of a conventional management apparatus of this type disclosed in, for example, Japanese Patent Application Laid-Open No. 59-75862. In the figure, reference numerals 1a and 1b denote a pair of host computers. The host computer 1a performs a main operation and the host computer 1b performs a standby operation. Reference numeral 2 denotes an operation management device for managing the operation states of the host computers 1a and 1b, 3 an inter-computer coupling device for transmitting and receiving information between the host computers 1a and 1b, and 4a to 4n, for example, character displays or graphic displays. Terminals 5 and 5 are switching devices for performing a switching operation so that each of the terminals 4a to 4n and the host computer 1a operating as the main unit are connected.

[0005] Next, the operation of the conventional management device configured as described above will be described. First, both host computers 1
a and 1b carry the same business processing program,
A standby standby duplex system is constructed with the operation management device 2 that manages these operation states.
The operation modes of the standby standby dual system include “operation”, “recovery”, and “stop” modes, which include both host computers 1a and 1b, respectively, and operate both host computers 1a and 1b. The relationship between the mode and the dual operation mode is as shown in Table 1 below.

[0004]

[Table 1]

FIG. 5 shows the operation process of the above-described dual system operation mode. First, an IPL (initial program program) is operated by operating a driving operation panel mounted on the operation management device 2.
When loading is performed, for example, the host computer 1a of the system to which the operation was instructed earlier recovers solely as the main machine (step S).
Do ₁ ). The single recovery refers to the initialization of the time process in the computer and the initialization of the main file. next,
Step S ₁ is completed, the operation management device 2 controls the switching unit 5, the host computer 1a and each of the terminals 4a~4n
The switching operation is performed so that the connection is established between the steps (a) and ( _b ), and the operation shifts to the isolated operation (step S2).

Further, the host computer 1b of the other system
If an operation instruction is given to the host computer 1b
It launched as a standby machine, namely for parallel recovery (Step S _3). In parallel recovery, step S ₂ has already been performed.
From the host computer 1a operating alone
Time information and file contents are input to the host computer 1b via the inter-computer coupling device 3 by a method such as copying.
Then, the step S ₃ is completed, both the host computer 1
a, 1b starts parallel operation performing the same business processing (step S _4). If one of the two host computers 1a and 1b is stopped in this parallel operation state (for example, a failure stop or an input stop from the operation console of the operation management device 2), the single operation is performed again (Step S). Return to ₂ ).

At this time, the operation process differs depending on whether the host computer 1a as a main unit or the host computer 1b as a standby unit is stopped. That is,
When the host computer 1a is stopped, when the operation management device 2 receives the stop state signal output from the host computer 1a, the operation management device 2 gives a system switching command signal to the host computer 1b, and the host computer 1b is turned off. In addition to being the main unit, the switching unit 5 is controlled to switch each of the terminals 4a to 4n to the host computer 1b side, and the host computer 1a is shut down.

In the case where the host computer 1b is stopped, when the operation management device 2 receives the stop state signal output from the host computer 1b, the operation management device 2 sends a system disconnection command signal to the host computer 1a to stop the operation. Host computer 1b
Is cut off. Furthermore, both host computers 1a, 1b
If both stopped, leading to both systems stopped (step S _5).

[0009] Next, in the parallel operation in step S _4, the terminal 4a~4n and both the host computer 1a, 1b
Will be described based on the sequence shown in FIG.
First, the information 11 input by the terminal 4a is transmitted to the switching device 5
Has been switched to the state as shown in FIG. 4 and is received by the host computer 1a as the main unit. The host computer 1a performs the business process 13 and passes through the inter-computer coupling device 3 as the information 13. The task processing 14 is performed in the same manner as the host computer 1a. And
The business process result is given to each of the terminals 4a to 4n as information 15a to 15n. In addition, for example, another terminal 4n
The information 21 input in the step 22 is also used in the same manner as described above.
The processing is performed according to the sequence indicated by n.

[0010]

Since the conventional management device is configured as described above, in order to construct a standby and standby dual system, each terminal 4a is controlled by the operation management device 2. 4n is required to be switched to the host computer 1a or the host computer 1b side, and there is a problem that the apparatus becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an inexpensive management device which does not require a switching device for constructing a standby redundant system. It is.

[0012]

A management apparatus according to the present invention is connected to both host computers so as to always be able to communicate with each other, recognizes a host computer which performs main machine operation by regular communication, and establishes a connection with the main machine. It is provided with a plurality of terminals, which are single-function computers that perform input / output and check processing for the host computer on the operation side.

[0013]

According to the present invention, the plurality of terminals of the management device are:
It recognizes the host computer that performs the main engine operation through periodic communication with both host computers, narrows the connection to the host computer that performs the main engine operation, and performs input / output and its check processing.

[0014]

【Example】

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the management device according to the first embodiment of the present invention. In the figure, a pair of host computers 1a and 1b, operation management device 2, and inter-computer coupling device 3 are the same as the conventional device shown in FIG. Reference numeral 6 denotes a bus-type LAN (local area network) laid between the host computers 1a and 1b, 7a to
Numerals 7n are connected to the bus-type LAN 6, respectively, and are terminals composed of a single-function computer, such as EWS, for inputting / outputting data and checking the data.

Next, the operation of the management apparatus according to the first embodiment configured as described above will be described with reference to the sequence shown in FIG. Since the host computers 1a and 1b and the terminals 7a to 7n operate asynchronously even when the power is turned on at the same time, the operation establishment times do not match. FIG. 2 shows a sequence in a case where the terminals 7a to 7n start up first and the host computers 1a and 1b start up later.
First, when each of the terminals 7a to 7n starts up, a host inquiry message 31 is issued to both the host computers 1a and 1b in the form of simultaneous broadcast.

This inquiry message 31 uses a generally known general-purpose protocol capable of simultaneously broadcasting without providing any connection to the other host computers 1a and 1b. Therefore, since this inquiry message 31 is performed connectionlessly, the timeout of the response message from the other party is not monitored, and for example, n
The message is transmitted at a constant period of minutes, that is, periodically, and is continued until a response message is returned from the other party. Assuming that the host computer 1a has started up at a certain time point t ₁ and the host computer 1b has started up at a time point t ₂ , the two host computers 1a and 1b report to the operation management device 2 respectively.
The host computer 1a establishes a main unit and the host computer 1b establishes a standby unit.

When the main unit is established by the host computer 1a, a host establishment message 33 is sent from the host computer 1a to each of the terminals 7a to 7n. A general-purpose protocol is also used for the transfer of the host establishment message 33, and the host establishment message 33 is simultaneously broadcast. At this time, even if any terminal, for example, 7x fails to receive the host establishment message 33, the inquiry message 31 is reissued from the terminal 7x in the next n minutes, and the host computer 1a sends the host Since the establishment message 33 is sent, the terminal device 7x recognizes the host establishment.

When the host establishment is recognized, each terminal 7a
7n and the host computer 1a, the connection is correctly established thereafter, and each of the terminals 7a to 7n communicates only with the host computer 1a. For example, terminal 7
When an input operation is performed on a, the terminal 7a checks the input data, and then transmits the data 34 to the host computer 1a. On the other hand, when receiving the data 34, the host computer 1a returns a reception message 35 to the terminal 7a and delivers the received data 34 to the host computer 1b. As described above, the exchange of each data between the host computer 1a and each of the terminals 7a to 7n is performed via the bus-type LAN 6.

Next, the operation when the system switching is performed will be described with reference to the sequence shown in FIG. First, in a normal state, the processing data 36 is transferred from the host computer 1a as the main unit to each of the terminals 7a to 7n.
On the other hand, each of the terminals 7a to 7n sends the host computer 1
The reception response message 37 is returned to a. Now, assuming that the host computer 1a stops at a certain time point t ₃ and the transfer of the processing data 36 is interrupted as indicated by X in FIG.
The operation management device 2 detects this by the report 38, and
_{In step 4} , a switching command 39 is given to the host computer 1b to operate the host computer 1b as the main unit and disconnect the stopped host computer 1a.

The switching command 39 causes the host computer 1
b recognizes that it has become the new main unit, and each of the terminals 7a to 7n
Broadcasts a host establishment message 40 simultaneously. On the other hand, each of the terminals 7a to 7n recognizes from the host establishment message 40 that the host computer 1b is the main unit,
A confirmation message 41 is returned to the host computer 1b. In this way, a new connection relationship is set between the host computer 1b, which has become the new master, and each of the terminals 7a to 7n, and a connection is correctly established thereafter, and each terminal 7a
7n communicate only with the host computer 1b.

That is, the processing data 42 is sent from the host computer 1b to the terminal 7n, and the reception message 43 is returned from the terminal 7a. When an input operation is performed on the terminal 7a, the terminal 7a checks the input data and transmits the data 44 to the host computer 1b. On the other hand, when receiving the data 44, the host computer 1b returns a received message 45 to the terminal 7a.

According to the first embodiment, each of the terminals 7a to 7a
n is an EWS, and each of the terminals 7a to 7n is a bus type L
Through the AN 6, the host computer 1 a, 1 b sends an indefinite periodical call to the host computers 1 a and 1 b according to a general-purpose protocol. Once the host computer 1 a is recognized as the main unit, communication with the host computer 1 a is performed only by specifying the destination. Therefore, a standby standby dual system can be constructed without using the switching device 5 unlike the conventional device,
Also, by using EWS for each of the terminals 7a to 7n,
The load on both host computers 1a and 1b can be shared, and both host computers 1a and 1b need only have a relatively small capacity.

[0023]

As described above, according to the present invention, both host computers are connected so as to always be able to communicate with each other, and the host computer which performs the main machine operation by periodic communication is recognized, and the connection is established with the main machine operation. Since there are a plurality of single-function computers that perform input / output and check processing for the host computer on the executing side, a switching device for constructing a standby / stand-by dual system is not required and an inexpensive management device Can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a management device according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram for explaining an operation of the management device in FIG. 1;

FIG. 3 is a sequence diagram for explaining a system switching operation of the management device in FIG. 1;

FIG. 4 is a block diagram illustrating a schematic configuration of a conventional management device.

FIG. 5 is a flowchart showing an operation process of the management device in FIG. 4;

FIG. 6 is a sequence diagram for explaining an operation of the management device in FIG. 4;

[Explanation of symbols]

 1a, 1b Host computer 2 Operation management device 3 Computer-to-computer coupling device 6 Bus-type LAN 7a, 7b Terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B61L 27/00-27/04 G05B 9/03

Claims (1)

(57) [Claims] An identical processing program is installed, one of which performs a main engine operation and the other of which performs a standby operation, and a pair of host computers for monitoring the operation state of both host computers, The operation management device that manages whether the computer operates as the main engine and the host computers are connected so as to always be able to communicate with each other, and recognizes the host computer that performs the main engine operation by regular communication, and establishes a connection with the main machine. A management device, comprising: a plurality of terminals each of which is a single-function computer that performs input / output and check processing on the host computer on the side of operation.