Special considerations apply when you are migrating a high-availability domain.
High availability is the requirement for a system to be running all, or for a very high proportion of, the time. Providing a high-availability environment involves having multiple brokers so that some brokers can be used for backup purposes. The entire production domain might be duplicated so that the backup system can be switched on in the event of a problem.
When you migrate, a high-availability environment presents a potential problem because a vulnerable period exists between stopping the previous version of the product, and installing and starting WebSphere® Event Broker Version 6.0. One solution is to install and configure WebSphere Event Broker Version 6.0 while the previous version of the product is running in parallel, and then switch to WebSphere Event Broker Version 6.0. Install WebSphere Event Broker Version 6.0 on the same computers that are running the previous version of the product, or on a different set of computers.
The following sections of this topic provide a general framework for how you might want to migrate your high-availability domain. Adjust this guidance to suit your specific circumstances and refer to the product-specific migration topics for detailed migration instructions.
By migrating the test domain first, you can ensure that operation is successful after migration, and solve any problems before migrating the production domain. Test the migration of your resources to WebSphere Event Broker Version 6.0 for each functional area in turn. The following steps describe one way in which to migrate the test domain to minimize disruption. Refer to the product-specific migration topics for detailed instructions.
When you are ready to perform migration, back up your resources.