If you have Web services gateways running on WebSphere Application Server Version 5 application servers they can, subject to certain restrictions, coexist with WebSphere Application Server Version 6 gateways. Alternatively, you can migrate the gateways, and the application servers on which they are running, to WebSphere Application server Version 6.
Before you choose to use a mixture of Version 5 and Version 6 gateways, or to migrate your Version 5 gateways, you should be aware of the restrictions to gateway coexistence and the approach taken to gateway migration. For more information see Coexistence: Preserve or migrate a Version 5 gateway.
Web services gateways running on WebSphere Application Server Version 5 application servers can coexist with Version 6 gateways. If your deployment is not affected by the restrictions to coexistence, and your Version 5 gateways are not part of Network Deployment cells, then you need take no further action.
Version 6 Network Deployment cells can contain both Version 5 and Version 6 application servers, so you can continue to use gateways that are running in a cell even if you migrate the cell from Version 5 to Version 6. However when you migrate a cell, any previously configured gateway on any Version 5 application server in the cell is replaced with an empty gateway. To preserve your gateway configuration, you must follow the steps given in Preserving a Version 5 gateway when migrating a Version 5 cell.
The alternative to coexistence is to migrate each Version 5 gateway to the Version 6 gateway capability on a Version 6 application server, by following the steps given in Migrating a complete gateway configuration. Note that you cannot migrate a gateway to a Version 6 application server that is part of a cluster. To achieve a clustered configuration, migrate your gateway to a single server that is part of a managed cell, then manually convert the Version 6 single server to a cluster.