You can modify the failover capability of a messaging engine during
runtime. However you should not do this unless it is absolutely necessary.
Why and when to perform this task
You modify the failover capability of messaging engines by changing
the policy that applies to the corresponding high availability group. The
servers in the cluster will receive the configuration update and the changes
that you make take effect as soon as you click
Save.
For example, if you have a One of N policy which has no preferred servers,
and you change it to enable fail back and add a preferred server, when you
click
Save the
HAManager will
ensure that the
messaging engine is
running on the new preferred server; if the
messaging engine is
running on a different server, the
HAManager will
move it to the preferred server.
Steps for this task
- If you are about to change the policy so that the messaging engine will
run on a different server, or you are adding new servers, make sure that the
servers can access the messaging engine's
data store.
- Follow the steps in Changing the policy of a high availability group to modify
the policy.
See also
High availability manager.