9.4.3 A single cluster bus member and one messaging engine
This scenario assumes that all the appservers in the cell belong to one cluster and that cluster is a member of the bus.
The benefit of this scenario is:
- The messaging engine is highly available. If the messaging engine or the server on which it runs fails, then the messaging engine starts up on another available server in the cluster.
The drawback of this scenario is:
- If you want to ensure that the messaging engine runs on one preferred server, for example, if you have one primary server and one backup server, then specifically configure this.
Be aware that some configurations of preferred servers for a messaging engine can make that messaging engine not highly available.
If preferred servers are set up for the messaging engine with the preferred servers only option, then it is possible, if none of the preferred servers are available, that the messaging engine will not have another server on which to start even if other servers are available in the cluster.