JP2776442B2 - Compound computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to quickly restart services when an operating computer system (hereinafter simply referred to as "operating system") stops due to a sudden hardware / software failure. In addition, it relates to a complex computer system that realizes minimizing the service stop time by setting the standby system in the activated state in advance when the operating system is executed and automatically taking over the operation in the standby system when the operating system is stopped. is there.

[0002]

2. Description of the Related Art In a complex computer system, when an operating system starts a service, a standby system is activated so that an online job can be executed immediately, so that a system failure of the operating system can be performed. Realize continuous online service operation by switching systems. In a conventional complex computer system, the shared communication control device is opened when the old operating system is stopped by notifying the shared communication control device when the system is switched, or when the operating system is stopped by the system operation monitoring function of the shared communication control device. Disconnect all the sessions you are doing to create the same state as the initial state. The new operating system performs a session opening operation for the defined terminal, and terminals under the shared communication control device are reconnected.
Therefore, for the terminal user, the service can be temporarily stopped and re-connected.

[0003]

In the case of system switching in the event of a failure in the operating system, the above-described terminal reconnection process becomes longer as the number of terminals increases. Also, disconnection and reconnection of a terminal session took a very long time because control messages based on the connection procedure flowed on the online network. For this reason, the time required for the entire system switchover process becomes longer, and for the terminal user, the service suspension time becomes extremely long with the increase in the system scale, which has been a problem in actual business operation.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a compound computer system capable of realizing quick system switching without depending on the number of terminals. It is in.

[0005]

SUMMARY OF THE INVENTION A standby session is established in advance from a standby system for a terminal whose operating system has established a session. The standby session at this time is a virtual one between the shared communication control device and the online service system on the standby system. When this session exists, the terminal and the shared communication control device Do not disconnect the session. For this reason, when the new operating system is active, the online service can be immediately restarted without reconnecting the session.

[0006]

(1) The standby system is activated in advance, the online service can be executed, and the service of the operating system is started.

[0007] The operating system and the standby system open a session for the same terminal at the same time. At this time, the session from the standby system is virtual only between the online service system and the shared communication control device.

When a virtual standby session exists while a session with an actual terminal in the operating system exists, the shared communication control device stops the old operating system with respect to the shared communication control device at the time of system switching. Depends on the number of terminals without disconnecting the session with the terminal in the notification or monitoring of the operating system stoppage of the shared communication control device, and the online system of the new operating system does not reconnect to the already opened session Quick system switching is realized. (2) / (3) The activation of the operating system is notified to the standby system that has been activated in advance by the inter-system communication means and the inter-system communication device. On the other hand, it is very burdensome to transmit the session opening event to the standby system by the inter-system communication means. this is,
This is because, when a session is opened in the operating system at once, there is a risk that the capacity of the inter-system communication means may be exceeded. In addition, a method of avoiding a failure of the inter-system communication means becomes difficult.

[0009] The event of the session connection of the operating session is transmitted by recording it in the status takeover file every time a session is opened. Each time a session is opened, the name of the terminal to be opened is recorded in the file so that the user can know how far the terminal has been recorded.

In the standby system, the content of the status takeover file is periodically checked from the time of detecting the activation of the operating system, and it is determined from the effective position of the latest information whether or not the session status has changed in the operating system. Even when a session is opened in the operating system at a stretch, the session state can be surely taken over by recording and reading the file until the end of the file is reached. (4) / (5) The operation session is established by the session attribute based on the network definition of the operation system.
The same applies to the standby session, but the session attribute actually used for controlling the conversation between the terminal and the online service system is, of course, the attribute in the active session. That is, when the session attribute of the active session does not match the session attribute of the standby session, inconsistency occurs in conversation control between the terminal and the online service system at the time of system switching.

To avoid this, the session attribute of the active session is compared with the session attribute of the standby session, and if they are different, the opening of the standby session is not performed. As a result, for the session for the terminal, disconnection and reconnection are performed at the time of system switching in the same manner as in the related art. (6) In a system having a shared communication control device that can be set up regardless of whether there is an active session or not, a standby session can be set up all the time. As a result, whether or not the information that has established a session so far has been recorded in the session status takeover file is recorded. Even in a system in which an active session repeatedly connects and disconnects a finite session state takeover file, the file is prevented from reaching the end of the file, and a reliable standby session is opened. (7) When a failure occurs in the shared communication control device, the standby session is also disconnected. Therefore, in the reconnection after the disconnection of the operating session due to the failure of the shared communication control device, the session opening event must be recorded in the operating system even after the session opening event is once recorded.

In this case, the takeover information is not finite. The takeover file is reused from the beginning of the file when the end of the file is reached, thereby realizing a permanent takeover of the session state. In a finite takeover file, before the standby system reads, in order to prevent overwriting of takeover data due to reuse, after a period longer than the standby system read cycle from the time of the last connection event recording, By performing the reconnection after the recovery from the failure, the session state is surely taken over.

[0013]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, reference numeral 100 denotes an operation host computer for providing an online service, which includes an inter-system communication unit 101, a communication control unit 102, an activation control unit 111 which is a feature of the present invention, a session opening state recording unit 112, Session opening means 113, session reconnecting means 114, terminal name 116, session attribute 117, session takeover history 118, fault record 119,
An online service system 11 including a terminal status table 115 including an information recording area of a session takeover time 120
0.

A standby host computer 200 includes an inter-system communication unit 201, a communication control unit 202, and a switching control unit 211 which is a feature of the present invention.
A session opening means 213 including a session opening state reading means 212, a standby session checking means 214,
Handover file monitoring means 215 and terminal status table 21 including information storage area of terminal name 217 and session attribute 218
6 and an online service system 210 including

Further, reference numerals 103 and 203 denote inter-system communication devices for exchanging information between the two systems, and 204 monitors a system failure of the operating host computer 100.
This is a fault detection device that gives a notification to 0. Reference numeral 400 denotes a terminal name 411, a session attribute 412, and a record generation 41.
3, a session status takeover file including session status records 410 equal to or more than the number of terminals including the storage information area of No. 3
Reference numeral 300 denotes an operation / standby shared communication control device (hereinafter, referred to as a standby session opening means 301 and a session holding means 302).
800 is a terminal device.

For convenience of explanation, a session from the online service system 110 is assumed to be an operation session 500,
A session from the online service system 210 is represented by a standby session 600, and a session with the actual terminal device 800 is represented by a terminal session 700.

Next, the operation of this embodiment will be described with reference to the drawings. (Starting of System) In the multifunction computer system, the online service system 210 is started before the online service system 110 is started. When the online service system 210 is ready for the online service, the online service system 11
Start 0.

The start control means 111 first prepares for the service of its own system. Also, the communication control means 102
Execute the operating system declaration for. by this,
The session opening for the terminal device 800 requested by the online service system 110 is controlled by the communication control means 102 so that the terminal session 700 is actually opened as the operation session 500. When the preparation is completed, the activation control means 111 transmits an operating system activation declaration to the online service system 210 using the inter-system communication means 101.

This request is sent to the inter-system communication devices 103 and 203.
Is transmitted to the inter-system communication means 201 via The inter-system communication means 201 transmits this to the online service system 21
0, the inherited file monitoring means 215 sets a timer to cause the session open state reading means 212
Is used to periodically read the session state takeover file 400. As a result, the online service system 210 can acquire the latest session state record 410 information recorded when an event change such as a session opening occurs in the online service system 110.

Using the inter-system communication means 201, the online service system 210 sends a confirmation notice of the operating system activation declaration. This notification is sent to the online service system 110 by the inter-system communication means 101.
When the activation control unit 111 receives this confirmation notification, the operating system starts the service. Inter-system communication device 10
The inter-system communication path between the nodes 3 and 203 may have a failure. In such a case, the activation declaration and the confirmation notification are lost. These retransmission controls are performed by the inter-system communication means 10.
1 and activation control means 111. (Open Session) Online Service System 110
Opens a session with the terminal device 800 to be serviced when the online service system 110 is started and when a session opening command is input. Session opening means 11
3 searches the terminal status table 115 corresponding to the target terminal device 800 and issues a session opening instruction to the communication control means 102 to open a session. Since the communication control unit 102 has received the operation system declaration from the activation control unit 111, it requests the shared communication control device 300 to open the operation session 500. At this time, if the failure record 119 is recorded as “after failure”, the current time is referenced by referring to the session takeover time 120 and the takeover file monitoring unit 215
It is determined whether or not the monitoring period has elapsed sufficiently. If sufficient time has not elapsed, the session reconnection means 114 requests that the session be reconnected after the time has elapsed. The session reconnection means 114 waits for a sufficient time to elapse from the terminal, issues a session opening request to the session opening means 113, and executes the above processing again. If a sufficient time has elapsed, the failure record 119 is cleared and a session is opened.

The session opening means 113 acquires a session attribute on the network definition of the operating host computer 100 when the communication control means 102 accepts the session opening, and records it in the session attribute 117. Further, the session takeover history 118 is confirmed, and if the contents are cleared, the session establishment record request is issued to the session establishment state recording means 112 by specifying the terminal state table 115. If the session takeover history 118 has been taken over, no action is taken. Session opening status recording means 112
Receives the session opening record request, sets the terminal name 116 and the session attribute 117 of the specified terminal status table 115, and sets the terminal name 411 and the session attribute 412 after the previously written record of the session status takeover file 400. Then, the session status record 410 is written. Further, the current time is written in the record generation 413 and the session takeover time 120, and the session takeover history 11
Assume that session 8 has been taken over. If the record written last time is the last record of the file, write the same at the beginning. (Opening a waiting session) Online service system 2
10, the session opening status reading unit 212 is executed at the cycle started by the takeover file monitoring unit 215 at the time of startup.
To read the session state takeover file 400. Records whose read record 413 has a new record generation 413 are recognized as information to be taken over and are read one after another. If the record generation 413 has returned to the past, the record is still in the online service system 1
At 10 it is assumed that it is not recorded. In addition,
The determination time of the record generation 413 in the first reading at the time of starting the online service system 210 is included in the start declaration notification at the time of starting the online service system 110, and is referred to.

The succeeding file monitoring means 215 searches the corresponding terminal status table 216 from the terminal name 411 of the read session status record 410 and retrieves the session attribute 4
12 is recorded in the session attribute 218, and a session opening instruction is issued to the session opening means 213. When the session opening means 213 issues a session opening instruction to the communication control means 202, the communication control means 202 requests the shared communication control device 300 to open the standby session 600. The session opening means 213 can acquire a session attribute in the online definition of the standby host computer 200 when the communication control means 202 accepts the session opening. However, since this session attribute does not always coincide with the one that actually controls the terminal session 700, the standby session check unit 214 checks the attribute. The standby session check unit 214 compares the acquired session attribute with the content recorded in the session attribute 218 when the handover information is read. If not, the establishment of the waiting session 600 is rejected. (Operation at the Time of Session Failure) When the shared communication control device 300 fails, a notification of a failure of the communication control means 102 is sent to the online service system 110. When the session reconnection means 114 receives the failure notification, the terminal status table 115 of the relevant session is searched, the session takeover history 118 is cleared, and the failure record 119 is written as "after failure". If the terminal is a target for automatic recovery in the event of a failure, it is determined with reference to the session takeover time 120 whether or not the current time has passed sufficiently longer than the period monitored by the takeover file monitoring means 215. If a sufficient time has elapsed, a session opening request is issued to the session opening means 113, and the above-described session opening processing is attempted. Otherwise, the terminal waits for the process for that time, and then executes the process again. When the standby session 600 has been opened, a notification of a failure of the communication control unit 202 is sent to the online service system 210. In the online service system 210, it is assumed that the session is simply disconnected. (Role of a standby session) When the activation control unit 111 issues an operation system declaration to the communication control unit 102, when the online service system 110 issues a session opening request to the terminal device 800 to the communication control unit 102, the communication control unit 102 establishes an operation session 500 with the shared communication control device 300. In the shared communication control device 300, a terminal session 700
Is established, and the online service system 110 can realize transmission and reception of a message with the terminal device 800.

On the other hand, in the communication control means 202 which has not received the operation system declaration, the online service system 2
10 issues a session opening request to the terminal device 800 to the communication control means 202, the communication control means 202
Represents a standby session 600 for the shared communication control device 300.
Is established. When the shared communication control device 300 receives this, the session is controlled and maintained by the standby session opening means 301. The standby session opening means 301 controls the standby session 600 irrespective of whether the operation session 500 has been opened.

The shared communication control device 300 monitors the operating host computer 100. When the system communication stoppage is detected by this, or when the failure detection device 204 detects the failure stop of the operating host computer 100, the shared communication control device 300 When receiving the stop notification of the active host computer 100, the standby session opening unit 301 holds the session in the session holding unit 302 only for the terminal device 800 in which the active session 500 and the standby session 600 have been opened. Standby session 600 without running session 500
Indicates that the communication control means 202 has disconnected the failure of the standby session 600, and that the operation session 500 without the standby session 600 has transmitted the terminal session 700 to the terminal device 800.
The fault disconnection of each is performed.

Switching control means 2 for detecting the failure stop of operating host computer 100 by failure detection device 204
11 performs, after notifying the above-mentioned system stop detection,
The switching control unit 211 executes a takeover process of the online transaction service that the online service system 210 was executing. When this handover process is completed, the switching control unit 211 notifies the communication control unit 202 of the operating system declaration so that the online service system 210 resumes the service as the operating system. When receiving the operating system declaration, the communication control unit 202 takes over the communication state of the terminal session 700 with the shared communication control device 300. The session holding means 302 regards the standby session 600 as an active session, and thereafter allows the standby host computer 200 to transmit and receive via the terminal session 700.

[0026]

As described above, according to the present invention, in a multicomputer system, at the time of system switchover when an operating system fails, a session of a serviced terminal can be continued without disconnecting and reconnecting. Quick system switching that does not depend can be realized. Also, no matter how many times the terminal is connected or disconnected, it is not recorded in the session state takeover file unless the shared communication control device causes a failure. For this reason, even if the file is a finite session state takeover file, the terminal state can be taken over reliably if there are records for the number of terminals. Further, when a failure occurs in the shared communication control device, the standby session is also disconnected, so the session takeover record must be recorded.However, the session re-establishment after recovery from the failure is performed after the standby system has been monitored for at least the monitoring cycle time. In addition, the handover of the terminal state is reliably realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 operating host computer 101 inter-system communication means 102 communication control means 103 inter-system communication device 110 online service system 111 activation control means 112 session opening status recording means 113 session opening means 114 session reconnecting means 115 terminal status table 200 standby host computer 201 Inter-system communication means 202 Communication control means 203 Inter-system communication apparatus 204 Fault detection apparatus 210 Online service system 211 Switching control means 212 Session opening status reading means 213 Session opening means 214 Standby session checking means 215 Handover file monitoring means 216 Terminal status table 300 Operation / standby shared communication control device 301 standby session opening means 302 session holding means 400 session state takeover file Le 800 terminal devices

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 15/00 320 G06F 11/20 310 G06F 15/16 470

Claims (7)

(57) [Claims] 1. A standby system having the same device configuration and software configuration as an operating computer system is made to stand by in advance in a state where an online service can be immediately executed, and when the operating computer system provides an online service. In a composite computer system configured to switch to operation in the standby system when a failure occurs in the computer system, standby session opening means for simultaneously opening the same terminal from the active computer system and the standby system, and the active computer An operation / standby shared communication control device having a session holding means for restarting a session when the standby system starts operation without disconnecting the session in the event of a system failure; Opening a session for the same terminal in the standby system, generating a standby session in the shared communication control device, and notifying the shared communication control device that system switching has occurred in the standby system when an operating computer system fails. And restarting the held session to realize high-speed system switching without executing disconnection and reconnection of the session when a failure occurs. 2. The operating computer system according to claim 1, wherein the starting control means for controlling the system at the time of starting, the session opening means for opening a session with the terminal, and the information of the opening of the session are recorded in the session state transfer file. 2. The composite computer system according to claim 1, further comprising an online service system including a session opening status recording unit for storing the information. 3. The standby system according to claim 1, wherein the switching control unit controls switching of a system based on detection information of a failure detection unit that detects a failure stop of the active computer;
An online service system including session opening means for opening a session with the terminal, session opening status reading means for reading the contents of the session status handover file, and handover file monitoring means for monitoring the session opening of the active computer system; 2. The composite computer system according to claim 1, wherein: 4. The session takeover status file according to claim 2, wherein the session attribute of the active session is recorded.
Including session attribute field, session opening status recording means
Is the active session's session in the session attribute field above.
3. The composite computer system according to claim 2, further comprising session attribute recording means for recording the session attribute . 5. The session opening status reading means according to claim 3, wherein said session opening status reading means includes a session attribute obtaining means for an active session.
The method for opening a session is as follows:
Attribute and the operating computer system
Dynamic session attributes and wait if they are different.
Waiting session to check not to open a machine session
4. The composite computer system according to claim 3, further comprising an operation check unit . 6. The session opening means according to claim 2, wherein session inheritance history information indicating whether or not information on session establishment so far has been recorded in the session status inheritance file is recorded in the terminal status table, thereby establishing the session. 3. The composite computer system according to claim 2 , wherein state transition is realized irrespective of a state change amount. 7. The online service system according to claim 2, wherein the terminal status table for recording the failure record information of the shared communication control device and the takeover time information for recording the recording time of the first session connection event; 3. The multi-computer system according to claim 2, further comprising session reconnection means for performing connection after a lapse of a predetermined time from the recording time of the first session connection event.