Change the number of core group coordinators

For a large cell, multiple coordinators are recommended.

Before changing the number of core group coordinators for a cell:

• Make sure that you are familiar with the content of the topic Core group coordinator.

• Determine the number of coordinators for the core group. A general guideline is approximately one coordinator per 20 core group members.

Change the number of core group coordinators only if:

• IBM support instructs you to do so.

• We are directed to do so as part of the installation process for another WebSphere product.

• The coordinator process is consuming abnormally high amounts of memory or CPU resources.

• We are scaling up the number of servers in a cell.

To change the number of core group coordinators for a core group:

1. In the console, click Servers > Core Groups > Core group settings > , and select an existing core group.

2. In the Number of coordinators field, specify the number of coordinators we want for this core group.

3. Click OK, and then click Save.

4. Click Synchronize changes with nodes and then click Save again to save the changes.

5. If we need to change the list of preferred coordinator servers, click Preferred coordinator servers and then add or delete the appropriate application servers from the list of preferred coordinator servers.

6. Click OK and then clickReview.

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

Results

Your changes take effect immediately after synchronization completes. The members of the core group pick up these changes dynamically.

Subtopics

• Core group settings
  Use this page to create a core group or to edit an existing core group. A core group is a component of the high availability manager function. It can contain stand-alone servers, cluster members, node agents, administrative agents, and the deployment manager.

• Core group custom properties
  Use these custom properties for advanced configurations for core groups.

Related concepts

Core groups (high availability domains)

Core group coordinator

Related tasks

Configure core group preferred coordinators