Network Deployment (Distributed operating systems), v8.0 > Applications > Service integration > High availability and workload sharing > Service integration high availability and workload sharing configurations > Policies for service integration
Messaging engine policy assistance
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.
We 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.
We 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, 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.
- High availability messaging engine policy
The high availability messaging engine policy is a predefined messaging engine policy type provided when you use messaging engine policy assistance. It helps you to create and configure a messaging engine in a cluster that is a member of a bus when you want the messaging engine to be highly available.
- Scalability messaging engine policy
The scalability messaging engine policy is a predefined messaging engine policy type provided when you use messaging engine policy assistance. It helps you to create and configure messaging engines in a cluster that is a member of a bus when you require a configuration that is easy to expand for performance or workload sharing.
- Scalability with high availability messaging engine policy
The scalability with high availability messaging engine policy is a predefined messaging engine policy type provided when you use messaging engine policy assistance. It helps you to configure a cluster that is a member of a bus when you require both high availability and scalability in the cluster.
- Custom messaging engine policy
The custom messaging engine policy is a messaging engine policy type provided when you use messaging engine policy assistance. It helps you to create and configure messaging engines in a cluster that is a member of a bus when the predefined messaging engine policy types do not meet your needs. We can configure the messaging engine behavior, then the appropriate messaging engine policies are created automatically.
Bus member types and their effect on high availability and workload sharing Service integration high availability and workload sharing configurations Match criteria for service integration
Add a cluster as a member of a bus Create a policy for messaging engines Configure high availability and workload sharing of service integration Configure messaging engines Correcting the messaging engine policy Delete a redundant core group policy Modify the messaging engine policy for a cluster bus member