You can modify the failover capability of a messaging engine
at run time. However, do not do this unless it is absolutely necessary.
About this task
To modify the failover capability of messaging engines, you
change the policy that applies to the corresponding high availability
group. The servers in the cluster receive the configuration update
and the changes take effect as soon as you save them. For example,
if there is a
"One of N" policy that has no preferred servers,
and you change it to add a preferred server and enable fail back,
when you click
Save, the
HAManager ensures that the
messaging engine is running on the new preferred server; if the messaging
engine is running on a different server, the
HAManager moves it to the
preferred server.