3.11.6 Configuration in which the executing node and standby node of the host unit management model are in an N-to-1 ratio
This subsection describes the configuration where node switching is performed for the host unit management model.
- Organization of this subsection
(1) Features of the system configuration
Configure the host unit management model in an N-to-1 ratio. The following is an example of the system configuration:
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![[Figure]](GRAPHICS/ZU034750.GIF)
Note: For other legend items, see 3.2 Description of the system configuration.
- Features
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Configuration where N machines for the executing node and one machine for the standby node of Application Server are allocated, and Management Server and Administration Agent are respectively allocated.
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Logical servers are allocated on separate hosts; however, externally they act as one logical server, whereas the Management Server instances operate on separate hosts and each has a respective management domain. Define one virtual host in one management domain, and respectively configure a host for the active node Application Server and a host for the standby node Application Server.
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Use the virtual IP address allocated by the cluster software as IP address used for operations of each Application Server, and use the actual IP address as the IP address of Management Server and Administration Agent.
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A shared disk device is required for using a global transaction. One shared disk is required for each virtual host.
- Reference note
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The virtual host controls the starting and stopping of Application Server according to Administration Agent. The same IP address as the IP address used for operations is allocated, and the virtual host is defined in such a manner so that visually it seems to be the same host.
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- Node switching flow
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Node switching is execute when there is a failure on the Application Server machine in the executing node. Execute node switching when there is a failure in Management Server, Administration Agent, or cluster software.
On executing node switching, the Administration Agent and Management Server are started by cluster software of Application Server machine of standby node. The processes of the logical server that were stopped until then are started by the started Administration Agent.
(2) Processes to be started on each machine
This subsection describes the required software and processes of the respective machines.
(a) Application Server machine (executing node/ standby node)
You must install Application Server on the Application Server machine.
The processes that must be started on the Application Server machine of a node switching system in the host unit management model are as follows:
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Administration Agent
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Management Server
Depending on the functions to be used, the software required on the Application Server machine and the processes to be invoked differ for each system configuration. Allocate the software and processes required according to the functions used.
(b) Client machine
You must install the following software on the client machine:
- For Web client configuration
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Web browser
- For EJB client configuration
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uCosminexus Client (In Windows), Application Server