MVS Installation Exits

Table 1 describes MVS™ installation exits used for either system-managed or non-system-managed data.

Table 1. MVS Installation Exits
Name	Usage
IEFDB401	MVS Dynamic Allocation Exit: Enforce allocation standards. Called prior to ACS services execution; therefore, action taken in this exit must be designed considering your ACS routines' logic.
IGGDASU2 and IGGDARU3	Installation-Replaceable Module: Called before processing the DADSM request for SCRATCH and RENAME. If you have written your own IGGO3ODU or IGGO29ODU modules, update these modules for the DFSMS environment.