Messaging engine policy assistance provides guidance about creating
and configuring messaging engines in a cluster to provide the behavior you
require. Messaging engine policy assistance also automatically creates the
associated core group policies and other settings. Messaging engine policy
assistance is available when you add a cluster as a bus member, or when you
administer a messaging engine in a cluster.
For example, you can create and configure messaging engine policies to
provide high availability, scalability, or a combination of the two.
You can select from one of three predefined messaging engine policy types,
which support frequently-used cluster configurations. The administrative console
displays a diagram of the selected cluster and the effect of the selected
messaging engine policy type. If further changes are needed to use the policy
successfully, warning triangles are displayed for the components that might
cause a problem, and messages that suggest solutions are displayed.
The predefined messaging engine policy types are:
- High availability. The cluster has a single messaging engine that is configured
to fail over to any other server in the cluster.
- Scalability. There is one messaging engine for each server in the cluster.
Each messaging engine is restricted to a particular server and is not configured
to fail over.
- High availability and scalability. There is one messaging engine for each
server in the cluster. Each messaging engine can fail over to one other server
in the cluster. Each server can host up to two messaging engines.
You can also use messaging engine policy assistance to create a custom
configuration, where you can control how many messaging engines to create
and the messaging engine behavior. The associated core group policies are
still automatically created, even though you complete some configuration
yourself.
If you do not use messaging engine policy assistance, you must do the following:
- Create the messaging engine
- Configure a message store for the messaging engine
- Create a core group policy for the messaging engine
- Configure the core group policy to provide the required messaging engine
behavior
- Use match criteria to associate the policy with the messaging engine
Unless you are familiar with this procedure and have used it before, it
is preferable to use messaging engine policy assistance.