Performing a "rolling upgrade"

Important

The mixed level of operation described in this section, in which different CICS regions in the same logical server are at different levels of CICS, is intended to be used only for rolling upgrades. It should not be used permanently, because it increases the risk of failure in some interoperability scenarios. The normal, recommended, mode of operation is that all the regions in a logical sever should be at the same level of CICS and Java.

This section describes how to perform a "rolling upgrade" of a multi-region CICS EJB/CORBA server to CICS® Transaction Server for z/OS®, Version 3 Release 1. The process consists of the following steps:
  1. Checking that your logical server meets the criteria for a "rolling upgrade". See Requirement.
  2. Preliminary steps
  3. Migrating the listener regions
  4. Migrating the AORs
  5. Tidying up