MFX jobs will generally complete normally when a critical error or abend occurs in global DSM. The active MFX job will detect that global DSM is no longer available and will continue processing without attempting any further interaction with global DSM. However, if the DEBUG parameter is active on an MFX job step and an error or abend occurs in global DSM, the MFX job step will end with an internal abend (5DBW). This allows MFX to generate diagnostic information that will be helpful in debugging.