Specifying a preferred server for messaging requests

If a core group includes a cluster of application servers, and a messaging engine is configured for that cluster, any of the servers in that cluster can handle work items for the messaging engine. The default message provider in WebSphere Application Server is based on Service Integration Bus (SIB) technology, and is governed by the Default SIBus policy, which is a One of N policy. This policy ensures that only one of the application servers in the cluster is active at a time). You can modify the high availability group policy to specify that a specific cluster member handles the messaging work. Before specifying a preferred server for messaging requests:

• You should review the following topics:

  • High availability groups

  • High availability group policy modification guidelines

  • High availability group policies

• You must determine:

  • The name of the core group that includes the server that you want to handle messaging requests.

  • The name of the high availability group for the messaging function.

  • The name of the policy that is associated with this high availability group

• You must create a new policy specific to the high availability group that controls the messaging engine cluster, if one does not already exist.

  It is possible for a single policy to govern several different high availability groups. Therefore, to modify the policy for cluster scoped control, create a new policy specific to the high availability group that controls the messaging engine cluster. See Creating a policy for a high availability group for more information on how to create this policy.

  After you create the new policy and associate the policy with the high availability group for a given cluster, You can specify a preferred server for messaging requestws..

Overview

Procedure

1. In the administrative console, click Servers > Core groups > Core group settings > core_group_name.

2. Click the Runtime tab to determine both the name of the high availability group, and the name of the policy that is currently controlling the group. See Viewing high availability group information for more information on how to perform this step. You must have at least one of the group members running.

3. In the administrative console, click Servers > Core groups > Core group settings > core_group_name > Policies.

4. Click the name of the policy that you want to modify.

5. Under Additional Properties, select Preferred servers and select the preferred servers for this policy.

   Click Add to move core group servers into the list of preferred servers.

   Select specific servers in the list and click Move up and Move down to adjust the order of the servers within the list. Verify the most preferred server is at the beginning of the list and the least preferred server is at the end of the list.

6. After you complete the preferred servers list, click OK.

7. Click OK and then click Review.

8. Select Synchronize changes with nodes, and then click Save.

Results

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