Multi-system considerations for the default undo log

If your environment has multiple instances of CICS® VR implemented in a sysplex, and the CICS VR instances perform undo logging, consider these suggestions when defining the prefix for the default undo log.

If the default undo log is to be shared by all CICS VR instances on all systems in the sysplex, make sure that you specify the same undo log prefix on all systems.
If the default undo log is to be shared by all CICS VR instances in a specific CICS VR XCF group, make sure that you specify the same undo log prefix on all systems that are included in the XCF group. Other systems which have an instance of CICS VR belonging to a different XCF group must have a different value defined for the undo log prefix.