Before you begin
Read Overview of migration, coexistence, and interoperability and Premigration considerations. For resources to help you plan and perform
your migration, visit Knowledge Collection: Migration planning for WebSphere Application Server.
WebSphere Application Server Version 7.0 is generally interoperable with Version 5.1.x and Version
6.x. However, there are specific requirements to address for each
version. In general, you should be at the most recent group PTF level
to support interoperability.
You can upgrade a portion of the nodes in a cell
to
WebSphere Application Server Version 7.0
while leaving others at the older release level. This means that,
for a period of time, you might be administering servers that are
at the current release and servers that are running the newer release
in the same cell.
Restrictions on using mixed-release cells:
- A mixed-release environment where some members are at an older
release level might have some restrictions. For details, read the
"Creating application servers" article in the information center.
- A WebSphere Application Server, Network Deployment cell can contain mixed releases of
Version 5.1.x or Version 6.x nodes, but there is no mixed-node management
support for Version 6.0.0.x and Version 6.0.1.x.
The
Version 7.0
migration tools still migrate these nodes during deployment-manager
migration, but they issue a warning message that the nodes cannot
be managed by the
Version 7.0 deployment manager. You can then do
one of the following based on your needs:
- Upgrade all Version 6.0.0.x and Version 6.0.1.x nodes to at least
Version 6.0.2. This will allow them to be administered by a Version 7.0 deployment manager.
- Migrate these nodes to Version 7.0.
- If you want to interoperate Version 7.0 with Version 5.1.x, you
must be at or above the Version 5.1.1.1 level. Older levels of Version
5.1 do not support interoperability with Version 7.0.
- You cannot add a Version 5.1.x node to an existing cell managed
by a Version 7.0 deployment manager. You can only include a Version
5.1.x node in a Version 7.0 mixed-release cell through migration.
First, migrate the Version 5.1.x deployment manager to Version 7.0;
and then either keep the nodes at Version 5.1.x or migrate them to
Version 7.0.