WebSphere Application Server Network Deployment, Version 6.1
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Disabling or enabling a high availability manager

A unique HAManagerService configuration object exists for every core group member. The enable attribute in this configuration object determines if the high availability manager is enabled or disabled for the corresponding process. When the enable attribute is set to true, the high availability manager is enabled. When the enable attribute is set to false, the high availability manager is disabled. By default, the high availability manager is enabled. If the setting for the enable attribute is changed, the corresponding process must be restarted before the change goes into effect.

Before you begin

Determine if you need to use a high availability manager to manage members of a core group.

About this task

You might want to disable a high availability manager if you are trying to reduce the amount of resources, such as CPU and memory, that WebSphere Application Server uses and have determined that the high availability manager is not required on some or all of the processes in a core group.

You might need to enable a high availability manager that you previously disabled because you are installing applications on core group members that must be highly available.

Avoid trouble: If you are running on Version 6.1.0.16 or earlier, you must use the wsadmin tool to disable a high availability manager or to enable a high availability manager that you previously disabled. If you are running on Version 6.1.0.17 or later, you can use either the wsadmin tool or the administrative console to disable a high availability manager or to enable a high availability manager that you previously disabledgotcha

Procedure

Results

The processes start with the high availability manager in the changed state.

What to do next

To verify that the high availability manager is in the proper state, check the log file for one of the following messages:

HMGR0005I: The Single Server DCS Core Stack transport has been started for core group DefaultCoreGroup.    

This message indicates that the high availability manager is disabled because the high availability manager communication transport can only establish communication with a single server process.

HMGR0001I: The DCS Core Stack transport has been started for core group DefaultCoreGroup. There are x members.

This message indicates that the high availability manager is enabled because the high availability manager communication transport can establish communication with multiple server processes. x indicates the number of server processes with which communication is established.




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Last updated: Feb 25, 2009 9:32:38 AM CST
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