Network Deployment (Distributed operating systems), v8.0 > Reference > Sets
Create a cluster: Basic cluster settings
Use this page to enter the basic settings for a cluster. From the console...
Servers > Clusters > WebSphere application server clusters > New.
Cluster name
Name of the cluster. The cluster name must be unique within the cell.
Prefer local
Specifies that the host scoped routing optimization is enabled or disabled. The default is enabled, which means that, when possible, enterprise bean requests are routed to the client host. Enabling this setting improves performance because client requests are sent to local enterprise beans.
Data type Boolean Default true If you enable the preferLocal optimization, the dmgr must be running to affect the configuration. If the dmgr is shut down, preferLocal optimization is not performed and requests might be dispersed across all the members of the cluster.
Configure HTTP session memory-to-memory replication
Specifies that when the cluster is created, a memory-to-memory replication domain is created for each of the members of this cluster.
If a replication domain is created, it is given the same name as the cluster and is configured with the default settings for a replication domain. When the default settings are in effect, a single replica is created for each piece of data and encryption is disabled.
If the WAS cluster has session Memory to Memory replication enabled, then the plug-in configuration file for that server cluster must have the GETDWLMTable property set to true.
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Also, if a replication domain is created, the SIP container and web container for each cluster member is configured for memory-to-memory replication.
To modify the replication domain settings, in the admin console, click Environment > Replication domains > replication_domain_name.
The default mode setting for the replication domain is Both client and server. In this mode, all data sent to either the client or the server is replicated. This setting is good for an environment that has a middle to low traffic load. However, if the environment has a high traffic load, you should change the replication domain mode setting to either Client only , or Server only, because these settings provide better scaling. In Client only mode, only data sent to the client is replicated. In Server only mode, only data sent to the server is replicated.
To modify the mode setting for a replication domain:
If you change any of the replication domain settings for one cluster member, including the mode setting, you should change them for all of the other members of the cluster.
- In the admin console, click...
Servers > Server Types > WebSphere application servers > server_name
- Under Container settings, click either SIP container settings or Web container settings, and then click Session management > Distributed environment settings > Memory-to-memory replication.
- Select a different mode. It does not matter whether you change the mode under the SIP container or the web container because the same replication domain settings apply to both containers.
Clusters and workload management
Create clusters
Related
Create a cluster: Create first cluster member
Create a cluster: Create additional cluster members
Create a cluster: Summary settings