CICS uses JOURNALMODEL definitions to resolve log stream names at the following times:
On a cold, warm or emergency restart, CICS® retrieves the log stream name from the CICS global catalog.
Any further references to the discarded journal name means that CICS must again resolve the log stream name by looking for a matching JOURNALMODEL resource definition. You can change the log stream name for a user journal by installing a modified JOURNALMODEL definition.
A JOURNALMODEL definition generally specifies a generic journal name, thereby mapping to the same MVS™ log stream any journal names that match on the generic name. JOURNALMODEL definitions can also be specific models and, using JOURNALMODEL definitions, you can map many journals or forward recovery logs to the same MVS log stream, or assign them to SMF (see Figure 8).