JPH1027146A - Communication processor and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the concentration of loads into a specific host by grasping the load states of application programs(APs) on respective hosts and opening the cession of an AP terminal on a host having a minimum load with respect to a communication processor for managing a cession between a host and a terminal. SOLUTION: A host communication process 21 in the communication processor 2 retrieves an AP management table 22 for managing the operation states of respective APs in respective hosts 11 to 1n and opens a cession for a host in which an AP to be connected to the cession is in a driven state. When a host having an AP of a driven state does not exist, a cession is opened by judging the load states of respective hosts 11 to 1n from the AP management table 22. When a fault is generated on a certain host, the processor 2 determines a destination to be reconnected to the cession for each AP while considering the load states of respective hosts 11 to 1n and automatically executes the reconnection of the cession.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication processing apparatus connected to a plurality of file-sharing hosts and an A-type network in which a plurality of terminals are connected.
A method of distributing a session by switching Ps and a device therefor, in the event of a host failure, a communication processing method capable of opening a session with another host and continuing business without disconnecting or reconnecting the session from the terminal About.

[0002]

2. Description of the Related Art Conventionally, a method in which a communication processing apparatus dynamically switches sessions on a network system connected to a plurality of hosts is disclosed in Japanese Patent Laid-Open No. 1-134.
No. 552. JP-A-1-134455
The technique disclosed in Japanese Patent Laid-Open No. 2 (1999) -1995 is a method of automatically switching sessions for each host without forcing the operation of a terminal user at the time of switching hosts.

However, the communication processing device manages a session using the name of an application program (hereinafter referred to as an AP) of a connection destination, and considers connection of a session in consideration of load control and load control in the event of a host failure. It does not disclose a method for switching sessions.

[0004]

A first problem is that, in the prior art, the communication processing apparatus reconnects the terminal session to the host without being aware of the load state of the switching destination host when the session is switched. It is.

[0005] The reason is that the same AP exists in a plurality of hosts on a network in which a plurality of hosts exist, and the communication processing apparatus has no means for grasping the load state of the AP on each host. This is because it was connected to the specified host.

A second problem is that session switching can be executed only on a host basis at the time of session switching in the prior art.

[0007] The reason is that the communication processing device is the host AP.
This is because there is no means for managing the session of the connected AP.

An object of the present invention is to provide a communication processing apparatus for managing a session between host terminals, which grasps the load state of an AP on a host and transmits a session of the terminal to an AP on a host having the least load. Is connected so that the load does not concentrate on a specific host in a network of a plurality of hosts.

Further, when a failure occurs in the host, the user of the terminal is not required to perform an operation of reconnecting the session, and the session is automatically reconnected in consideration of the load state on an AP basis. The purpose is to improve the performance of each host.

[0010]

According to the present invention, as a means for solving the above-mentioned problems, a communication processing device (2 in FIG. 1) connected to a plurality of file sharing type hosts (11 to 1n in FIG. 1). ), This communication processing device and a plurality of terminals (FIG. 1).
In a file sharing type multiprocessor environment in which the communication processing devices 31 to 3m are connected via a communication line, a host communication process (FIG. 1) for managing communication with a host in the communication processing device.
21), an AP management table (22 in FIG. 1) for managing the states of the APs on a plurality of hosts connected to the communication processing device, and managing the states of a plurality of terminals that have established sessions with the hosts. Session management table (2 in FIG. 1)
3) and communication management (24 in FIG. 1) for notifying the host communication process of an AP suppression command.

The AP management table 22 stores the AP of each host.
Is a resource for managing the state of the communication processing device on the communication processing device.
There are three types of AP states: active, standby, and standby. The operating state indicates that the AP on the host is in an active state and a session can be opened. The standby state indicates a state in which the AP on the host is in an active state, but the establishment of a session is refused. The operation waiting state indicates that the AP on the host is not in the active state, and when the AP becomes active, the state of the AP is changed to standby.

It is desirable that the communication processing device has means for detecting a failure in a connection line with the host.

[Operation] When the host communication process detects a communication failure with the host, or when the communication management issues an AP suppression command to the host communication process,
The host communication process searches the AP management table in the communication processing device, and changes the operating state of the corresponding AP from active to standby. Next, the AP management table is searched to determine a host that puts the AP in operation instead of the AP that has been waiting for operation. After the host is determined, the AP operation status field of the corresponding host on the AP management table is changed from standby to active.

After the status change of the AP management table is completed, the session management table inside the communication processing apparatus is searched, and if there is a session connected to the AP whose status has been changed, the host address of the connection destination AP on the session management table is changed. I do. By changing the host address, the host to be connected at the time of a subsequent connection request from the terminal to the AP is changed.

That is, according to the present invention, the host communication process allows the AP to be brought into the operating state in consideration of the load of each host.
Is determined, the effect that the user does not need to be aware of the load distribution of each host can be obtained.

Referring further to the schematic configuration diagram of the present invention shown in FIG. 1, first, a host communication process 21 on the communication processing apparatus 2 executes an application program (A) on each host.
The AP management table 22 that manages the operation state of P) is searched, and a session is established with the host in which the AP to which the session is to be connected is in operation.

If there is no host in which the AP is in operation, the session is opened by judging the load status of each host from the AP management table.

The terminal name, terminal address, connection destination AP name, and connection destination host address of the established session are set in the session management table 23, and information of the established session is managed.

When a failure occurs on a host, the communication processing apparatus determines a session reconnection destination for each AP in consideration of the load state of each host, and automatically reconnects the session.

When the suppression of the AP is requested from the communication management 24, the communication processing device determines the reconnection destination of the session in consideration of the load state of each host, and automatically reconnects the session.

As described above, according to the present invention, in a communication processing apparatus for managing a session between a host and a terminal, the load state of the AP on the host is grasped, and a session of the terminal of the AP on the host with the least load is established. This can prevent the load from being concentrated on a specific host.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a first embodiment of the present invention establishes a plurality of file sharing type host groups 1 and a transmission path (hereinafter referred to as a data link) for transmitting and receiving information to and from the host groups. And a group of terminals 3 connected to the communication processing device 2 via a communication line. The host group 1 configures a multiprocessor environment including a maximum of n hosts, and a plurality of APs exist on these hosts. Each AP is operating only on one of the n hosts.

The communication processing device 2 includes a host communication process 21 for controlling the establishment of a session between the host and the terminal, and a communication processing device for managing the operating states of the APs on all the hosts with which the data link has been established. AP management table 22
A session management table 23 for managing session information of a terminal that has established a session with the AP on the host via the communication processing device;
It includes a communication management 24 for inputting a command when performing operation and suppression of P.

The terminal group 3 is composed of a maximum of m terminals, and each has established a session with an AP on a certain host in the host group 1. Each terminal has a unique terminal address in the terminal group 3.

FIG. 2 is a diagram showing the AP configuration of each host in the host group 1 of the present invention. Each host is assigned a host address, and is a unique value within the host group 1 connected to the communication management. For example, a host address 11 is allocated to the host 1, and A
P has five APs, AP1 to AP3 and AP5 to AP6, of which the AP in operation is AP2.

FIG. 3 is a diagram showing the contents of the AP management table 22 inside the communication processing device. The AP management table is a table in which, for all the APs existing in the host group 1, the operating state of each AP is stored for each host. AP
There are three types of operation: operation, standby, and operation standby, and a session can be established with an AP on a host whose AP status is active. At the time of host failure or AP switching, the state is changed from operation to operation waiting, and a session cannot be opened for the AP. The host communication process searches the AP management table based on the AP name specified at the time of a session establishment request from the terminal, detects a host in which the corresponding AP is in operation, and establishes a session with the host.

FIG. 4 is a diagram showing the contents of the session management table 23 inside the communication processing device. The session management table is a table that stores information on the terminal that has established a session between the terminal and the host via the communication processing device. When establishing a session from a terminal, the host communication process stores the address, terminal name, connection destination AP name, and host address of the connection destination AP in the session management table.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. Terminal 3 shown in FIG.
1 issues a session establishment request to AP1. When the communication processing device (2 in FIG. 1) receives the session opening request, the host communication process (2 in FIG. 1) in the communication processing device.
1) performs a connection destination host address determination process (FIG. 5).

In the connection destination host address determination processing of FIG. 5, the processing shifts to the operation host address search processing (FIG. 6) in the first data search from the input parameter "AP1" (steps 51, 52, 53, 55 of FIG. 5). ).

In the operation host address search processing of FIG.
The operation state field of AP1 in the AP management table is searched, and a process of acquiring a host address in which AP1 is in operation state is executed. However, AP1 does not have any active hosts on the AP management table.
The process proceeds to the P operation host determination processing (FIG. 7) (steps 61, 62, 63, 66, 64 in FIG. 6).

In the AP operation host determination process of FIG. 7, since the operation host determination process is executed for all the hosts, the exclusion host address of the input parameter is not specified. In the process of FIG. 7, the AP management table for all hosts is searched, and "A
Standby A when the number of operating APs is the smallest among the hosts defined as P1 "and there are a plurality of hosts meeting the conditions.
A host having a small number of Ps is set as an operation target host (steps 71, 72, 73, 74, 75, 76, 77, 7 in FIG. 7).
8, 79, 7B, 7C, 7D, 7E). In this case, the host having the host address 11 is the operation target host of the AP 1 and the AP 1 having the host address 11 in the AP management table.
Change the operation status field from standby to active.

After establishing the host address, the host communication process establishes a session with AP 1 on host address 11. After the establishment of the session is completed, the host communication process stores the information of the established session in the session management table (FIG. 4) in the communication processing device. In this case, the terminal name is terminal 1, the terminal address is 31,
AP1 for connection destination AP name and 1 for connection destination host address
Set 1.

With the above operation, a session is established using the AP name in consideration of the load state of the host.
Thereafter, when a session establishment request to AP1 is sent to the communication processing device, the host communication process is performed as shown in FIG.
The process of FIG. 6 searches the AP management table for a host in which AP1 is in operation, and establishes a session with the host (host address 11) of the search result.

Next, the host communication process 21
If a communication error is detected with the host, the host communication process executes a connection destination change AP name search process (FIG. 8).

In the connection destination change AP name search processing of FIG. 8, the host 1 is used as an input parameter to search the AP management table to obtain an AP name for which the connection destination needs to be changed. In this case, first, AP1 is a connection destination change target (steps 81, 82, 83, 86 in FIG. 8).

Next, the AP operation host determination processing of FIG. 7 is executed. The host that brings the AP into the operating state is the host with the smallest number of operating APs in the AP management table. If there are multiple corresponding hosts, standby A
The host with the smallest number of Ps is set as the AP operation host. In this case, AP1 and host address 11 are input parameters, and host 2 (host address 12) is an operation target host of AP1 (steps 71 to 7e in FIG. 7). Similarly, in the AP 2, the host 6 (host address 16) becomes the operation target host (steps 71 to 7e in FIG. 7).

After determining the host to which the AP is to be switched, the host 1
The operating state of the AP that has been in the operating state is changed from operating to operating waiting. In this case, AP1, AP in the AP management table
The operation status field 2 is changed from operation to operation waiting. After the AP suppression of the host 1 is completed, the AP1 operation state field of the host 2 is changed to operation on the AP management table, and similarly, the AP2 operation state field of the host 6 is changed to operation.

Next, in order to switch the session between the terminal and the host, the session management table shown in FIG. 4 is searched. Search the session management table for the terminal that has established a session for the host address of the failed host,
The host address is changed for each connection destination AP. in this case,
The connection destination AP host addresses of the terminals 1 and 3 are changed from 11 to 12. Similarly, the connection destination host address of the terminal 2 is changed from 11 to 16. With the above operation, when a failure occurs in the host, session switching is achieved by using the AP name and considering load distribution.

Communication management in the communication processing device (2 in FIG. 1)
When the suppression command for AP1 is input from 4), the host address of the host in which AP1 is in operation is acquired from the management table (steps 51, 52, and 52 in FIG. 5).
53, steps 61, 62, 65 in FIG. 6). in this case,
The host address 11 of the host 1 can be obtained. at the same time,
The AP1 operation status field of the host 1 is changed from active to standby, and AP1 on the host 1 is excluded from the connection destination for the new session establishment request.

Next, a host for bringing the AP 1 into the operating state is determined by the AP operating host determining process (71 to 7e in FIG. 7) shown in FIG. In this case, it is the host 2 (host address 12) that newly sets the AP 1 to the operating state. Next, the session management table (FIG. 4) is searched, and the connection destination AP host address of the terminal connected to the host address 11 is changed to 12. In this case, the connection destination A of the terminal 1
Change the P host address from 11 to 12. With the above processing, the switching of the session in consideration of the load control using the AP name is realized.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment (FIG. 9), the number of communication processing devices is increased to n. In the first embodiment, a maximum of m sessions are managed by the communication processing device. In the second embodiment, m / n sessions may be managed per communication processing device. Since the number of management sessions per communication processing device is reduced, the number of searches of the session management table at the time of session switching is reduced, and the processing speed of the switching process can be improved.

[0043]

The first effect is that a host failure or A
That is, when the suppression command of P is input, the communication processing device determines the host of the reconnection destination and performs the process of changing the connection destination host. As a result, the session can be automatically switched while considering the load distribution.

The reason is that, when a host failure or an AP suppression command is input, the communication processing device determines the host with the smallest load from the number of active APs and the number of standby APs, Alternatively, the session of the terminal that has established a session with the AP to be inhibited is automatically switched.

A second effect is that when a session is opened from a terminal, the communication processing device determines a host to be connected. This makes it possible to open a session in consideration of load distribution.

The reason is that, when the connection target AP is not operating in all the hosts at the time of the session opening request, the load state of each host is determined by the number of operating APs, and the AP on the host with the smallest number of operating APs is operated. This is because a session is established with the AP.

[Brief description of the drawings]

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

FIG. 2 is an AP configuration diagram of each host of a host group 1 of FIG. 1;

FIG. 3 is an AP management table of the communication processing apparatus of FIG. 1;

FIG. 4 is a session management table of the communication processing device of FIG. 1;

FIG. 5 is a flowchart of a connection destination host address determination process.

FIG. 6 is a flowchart of an operating host address search process;

FIG. 7 is a flowchart of an AP operation host determination process.

FIG. 8 is a flowchart of a connection destination change AP search process.

FIG. 9 is a system configuration diagram of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 File sharing type central processing unit 11-11n File sharing type central processing unit 2 Communication processing unit 21 Host communication process 22 AP management table 23 Session management table 24 Communication management 3 Terminal device group 31-3m Terminal

Claims (8)

[Claims] 1. A communication processing device is connected to a plurality of file sharing type host computers, and a session between the host and the terminal device is managed in a network connecting the communication processing device and a plurality of terminals. Resources for ascertaining the states of application programs (APs) on the plurality of hosts connected to the communication processing device, and resources for ascertaining the states of terminals connected to the APs And a communication processing device comprising: 2. The communication processing apparatus according to claim 1, further comprising means for managing a session using the AP name when managing a session between the host computer and the terminal. 3. The communication processing apparatus according to claim 1, further comprising: means for determining a session establishment target in consideration of a load state of each host when establishing the session. 4. A communication processing device connected to a plurality of file sharing type hosts, and a file sharing type multiprocessor environment in which the communication processing device and a plurality of terminals are connected through a communication line, wherein a host is included in the communication processing device. A host communication process for managing the communication of the communication processing device, an AP management table for managing the states of the APs on a plurality of hosts connected to the communication processing device, and managing the states of a plurality of terminals that have opened a session with the host. The communication processing device according to claim 1, further comprising: a session management table; and communication management for notifying the host communication process of an AP suppression command. 5. When the host failure or AP suppression command is input, the communication processing device determines the host with the smallest load from the number of active APs and the number of standby APs, and is operating on the host on which the host failure has occurred. 2. The method according to claim 1, wherein a session of the terminal that has opened a session with an AP or an AP to be suppressed is automatically switched.
The communication processing device according to claim 1. 6. A connection target AP at the time of a session establishment request
Is not active on all hosts, the load status of each host is determined by the number of active APs, the AP on the host with the least number of active APs is activated, and a session is opened for that AP. The communication processing device according to claim 1. 7. The communication processing device according to claim 1, comprising a plurality of said communication processing devices. 8. A communication processing apparatus is connected to a plurality of file sharing type host computers, and in a network connecting the communication processing apparatus and a plurality of terminals, a session between the host and the terminal apparatus is managed. Resources for ascertaining the states of application programs (APs) on the plurality of hosts connected to the communication processing device, and resources for ascertaining the states of terminals connected to the APs A communication processing method comprising: performing session distribution by switching using an AP name in consideration of load distribution to each host.