This topic explains how to plan to migrate 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.
Migrating in a high-availability environment presents a problem because there is a vulnerable period 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 either 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. You might need to adjust these instructions to suit your specific circumstances. Refer to the product-specific migration topics for detailed migration instructions.
When you are ready to perform migration, back up your resources.
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