You can change the messaging engine policy for a cluster bus member
that is already configured, and change the number of messaging engines and
their behavior so that they conform with the new messaging engine policy.
Before you begin
If you modify the messaging engine policy to provide a high availability
configuration, the cluster should contain at least two nodes, each with a
server on, that is, at least two physical machines.
About this task
Use this procedure when you have already added a server cluster
as a member of a bus and configured its messaging engines, and you now want
to change the configuration. For example, if a cluster is configured for high
availability, there is one messaging engine for the cluster and it is set
to fail over to any other server in the cluster. To change the cluster to
provide scalability, you need one messaging engine for each server, set so
that each messaging engine cannot fail over. Messaging engine policy assistance
guides you through this process by providing messages about the changes required
to achieve the required configuration.
Procedure
-
In the navigation pane, click
.
If messaging engine policy assistance is enabled, the Bus member
detail pane is displayed. If messaging engine policy assistance is not enabled,
the Messaging engine collection pane is displayed.
-
If messaging engine policy assistance is not enabled, click Enable
policy assistance and follow the instructions on the wizard.
-
From the Bus member detail pane, select one of the following messaging
engine policy types, then click Apply:
-
High availability
-
Scalability
-
Scalability with high availability
If these policy types do not satisfy your requirements, is possible
to select Custom and create your own configuration.
If you do this, the system cannot generate any advice or warning messages.
-
Examine the resulting diagram and the messages for the selected
messaging engine policy type. Act on the messages as follows:
- To add a server or a node, go back and change the cluster topology
before you continue with the current procedure.
- To add or remove messaging engines, under Additional Properties,
click Messaging engines and use the options on the
resulting pane.
- To correct messaging engine policies, under Additional
Properties, click Messaging engine policy maintenance and
use the options on the resulting pane.
At each stage, save your changes to the master configuration. If the
Bus members collection pane is displayed, click the cluster name to return
to the Bus member detail pane. When the "Is further configuration required"
column
for the selected messaging engine policy type displays No, the configuration
is complete.
-
If necessary, save your changes to the master configuration.
Results
The cluster has the number of messaging engines that are required
to conform to your selected messaging engine policy type. Any changes to the
core group policies associated with the messaging engines are made automatically.