Server cluster settings

Use this page to view or change the configuration of a server cluster instance, and to view the local topology of a server cluster instance.

To change the configuration and local topology of a server cluster, in the administrative console click Servers > Clusters > cluster_name.

To view runtime information, such as the state of the server cluster, click Servers > Clusters > cluster_name, and then click the Runtime tab.

To display the topology of a specific cluster, click Servers > Clusters > cluster_name, and then click the Local Topology tab.

If the high availability infrastructure is disabled and you require IIOP routing capabilities, follow the instructions contained in the topic Enabling static routing for a cluster to create a static route table. This table will enable the cluster to handle IIOP requests.

Important:

Configuration tab

Cluster name

Specifies a logical name for the cluster. The name must be unique among clusters within the containing cell.

Data type String

Short name

[z/OS]

Specifies the short name for this cluster. This field only appears if you are running on a z/OS platform.

The short name is used as the WLM APPLENV name for all servers that are part of this cluster.

If you specify a short name for a cluster member, the name:
  • Must be one to eight characters in length
  • Must contain only uppercase alphanumeric characters
  • Cannot start with a number
  • Must be unique in the cell

If you do not specify a short name, the system assigns a default short name that is automatically unique within the cell. You can change the generated short name to conform with your naming conventions.

Data type String

Unique Id

[z/OS]

Specifies the unique ID of this cluster.

The unique ID property is read-only. The system automatically generates the value.

Bounding node group name

Specifies the node group that bounds this cluster. All application servers that are members of a cluster must be on nodes that are members of the same node group.

A node group is a collection of WebSphere Application Server nodes. A node is a logical grouping of managed servers, usually on a computer system that has a distinct IP host address. All application servers that are members of a cluster must be on nodes that are members of the same node group. Nodes that are organized into a node group need enough capabilities in common to ensure that clusters formed across the nodes in the node group can host the same application in each cluster member. A node must be a member of at least one node group and can be a member of more than one node group.

Create and manage node groups by clicking System administration > Node groups in the administrative console.

Prefer local

[AIX HP-UX Linux Solaris Windows]

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.

[z/OS] This field does not apply for z/OS.

Data type Boolean
Default true
Supported configurations: [may2010] If you enable the preferLocal optimization, the deployment manager must be running to affect the configuration. If the deployment manager is shut down, preferLocal optimization is not performed and requests might be dispersed across all the members of the cluster. [may2010]
may2010
sptcfg

Enable high availability for persistent services

Specifies that the recovery of a failed transaction is allowed to failover from one cluster member to another. Transaction log recovery requires several configuration steps, and this is one of the steps in that process.

See the IBM WebSphere Developer Technical Journal articleTransactional high availability and deployment considerations in WebSphere Application Server V6 for more information.

Runtime tab

Cluster name

Specifies a logical name for the cluster. The name must be unique among clusters within the containing cell.

Data type String

Prefer local

[AIX HP-UX Linux Solaris Windows]

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.

[z/OS] This field does not apply for z/OS.

Data type Boolean
Default true
Supported configurations: [may2010] If you enable the preferLocal optimization, the deployment manager must be running to affect the configuration. If the deployment manager is shut down, preferLocal optimization is not performed and requests might be dispersed across all the members of the cluster. [may2010]
may2010
sptcfg

wlcID

[AIX HP-UX Linux Solaris Windows]

Specifies the currently registered workload controller (WLC) identifier for the cluster. This setting might not display for all configurations.

Data type String

State

Specifies whether the cluster is stopped, starting, or running.

If all cluster members are stopped, the cluster state is stopped. After you request to start a cluster, the cluster state briefly changes to starting and each server that is a member of that cluster launches, if it is not already running. When the first member launches, the state changes to websphere.cluster.partial.start. The state remains partially started until all cluster members are running, then the state changes to running. Similarly, when stopping a cluster, the state changes to partially stopped as the first member stops and changes to stopped when all members are not running.

Data type String
Range Valid values are starting, partially started, running, partially stopped, or stopped.



Related concepts
Clusters and workload management
[AIX HP-UX Linux Solaris Windows] Transactional high availability
Related tasks
Creating clusters
[AIX HP-UX Linux Solaris Windows] Configuring transaction properties for peer recovery
Related reference
[AIX HP-UX Linux Solaris Windows] Backup cluster settings
Server cluster collection
Reference topic    

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