WebSphere Application Server V7.0: Concepts ... - IBM Redbooks

Note: It is always a good practice to have comprehensive scripts to
configure the environment available as it eases various administration
tasks (such as setting up a new environment for testing purposes,
recreating the environment in case of a disaster, and so forth).
► Disadvantages
– Creation and continuous maintenance of these scripts can require a lot of
effort and therefore be expensive.
– Requires every change in the environment to be scripted.
– Administration tasks performed through the Integrated Solutions Console
in the existing environment are not migrated,
Automated migration with whole node upgrade
This migration approach relies on the runtime migration tools provided by
WebSphere Application Server Network Deployment. As when migrating a whole
node, the existing WebSphere V5 / V6 configuration is initially recreated in
WebSphere Application Server V7.0.". Subsequently, one node after the other
can be migrated whereby you have to consider that all applications on a node are
migrated at the same time.
This approach provides the following advantages and disadvantages:
► Advantages
– There is no need for self-written scripts. All migration is done using
WebSphere Application Server tools.
– All the information of the current configuration is moved to WebSphere
Application Server V7.0. Therefore you do not have to worry about missing
something.
► Disadvantages
– All the information of the current configuration is moved to WebSphere
Application Server V7.0. The disadvantage of this approach is that you will
also move configuration items that you no longer need.
– All applications on the node being migrated must be ready for migration at
the same time. Therefore, the time of migration is triggered by application
availability.
– Manual enablement of some upgraded features is still required.
– This approach is only viable if you are not redesigning your environment
Chapter 15. Migration 485