10.1.3 Cluster configurations supported by JP1/AJS3 - Web Console
JP1/AJS3 - Web Console supports cluster operation performed by cluster software. If you set up JP1/AJS3 - Web Console in a cluster configuration, even when a failure occurs on the Web Console server, the Web Console server can be failed over, allowing you to continue monitoring business operations on a client.
- Organization of this subsection
(1) Prerequisites for a cluster system
The following are the prerequisites for using JP1/AJS3 - Web Console in a cluster system.
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The cluster software must be able to control prerequisites 2 to 4 below.
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A shared disk that enables data to pass from the primary node to the secondary node must be available.
The details are as follows:
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The shared disk must be allocated before JP1/AJS3 - Web Console start.
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The shared disk must not be deallocated while JP1/AJS3 - Web Console are running.
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The shared disk must be deallocated after JP1/AJS3 - Web Console stop.
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The shared disk must be locked so that it is accessible only from the primary node.
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The files must be protected by the journal functionality of a file system so that they will not be lost if the system goes down or another problem occurs.
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In a failover, the integrity of the information written to the files must be assured and that information must be inherited.
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Forced failover must be possible if a process is using the shared disk.
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If an error is detected on the shared disk, the cluster software must control recovery measures, which must be transparent to JP1/AJS3 - Web Console. If JP1/AJS3 - Web Console need to be started or stopped in extended recovery measures, the cluster software must issue the start and stop requests to JP1/AJS3 - Web Console.
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The IP address used in cluster operation must meet the following conditions:
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Communication must be possible using the IP address used in cluster operation, which can be inherited.
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The IP address used in cluster operation must be uniquely identified from the host name used in cluster operation.
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The IP address used in cluster operation must have been assigned before JP1/AJS3 - Web Console is started.
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The IP address used in cluster operation must not be deleted during execution of JP1/AJS3 - Web Console.
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The mapping between the host name and IP address used in cluster operation must not be changed during execution of JP1/AJS3 - Web Console.
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The IP address used in cluster operation must be deleted after JP1/AJS3 - Web Console is stopped.
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When a network error is detected, the cluster software must control recovery measures, which must be transparent to JP1/AJS3 - Web Console. If JP1/AJS3 - Web Console need to be started or stopped in extended recovery measures, the cluster software must issue the start and stop requests to JP1/AJS3 - Web Console.
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The host name used in cluster operation must be set in the hosts file or on the name server so that TCP/IP communication is possible.
If the above prerequisites are not satisfied, a problem may occur during operation of JP1/AJS3 - Web Console. For example, the following problems may occur.
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If data written on the primary node is damaged when a failover occurs:
A problem such as an error, data loss, or start failure occurs and JP1/AJS3 - Web Console cannot operate normally.
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If recovery is not performed even when an error occurs in the NIC:
A communication error occurs and JP1/AJS3 - Web Console does not operate normally until the cluster software switches over the NIC or performs a failover to the other server occurs.
(2) Supported system configurations
The following are examples of cluster configurations:
If a cluster system is set up for JP1/AJS3 - Web Console and for JP1/AJS3 - Manager independently, they will fail over without affecting each other if a failure occurs.
Therefore, we recommend that you set up JP1/AJS3 - Web Console and JP1/AJS3 - Manager on different cluster systems.
- Cautionary note
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JP1/AJS3 - Web Console supports active-standby configuration in a cluster configuration, but does not support active-active configuration.