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Can PTFs be implemented without an IPL? If so, which regions need to be cycled?
Most PTFs that require an IPL will have a HOLD ACTION or HOLD IPL in them to indicate the necessary action.
Typically an IPL is not required after applying maintenance. In most cases, you only need to start the Coordinating Address Space (CAS) and/or the Product Address Space (PAS)
The first time that you restart a CAS after applying maintenance, the CAS might determine that a cold start is required to fully implement the new maintenance. If that is the case, the following messages are displayed in the JES joblog during CAS initialization:
BBMZA098I CAS(WGH0) AUTOMATIC COLD START IN PROGRESS FOR THIS STARTUP
BBMZA104I CAS SSID(WGH0) COLD START IN PROGRESS