Before you begin: Validate that the EDG3UX71 USERMOD does not conflict with any modifications that you have made to the IATUX71 exit.

DFSMSrmm supplies a USERMOD to IATUX71, called EDG3UX71, in SAMPLIB. Use EDG3UX71 to update IATUX71 in order to replace and append text to JES3 fetch-and-mount messages and to provide text for tape drive displays. Perform these steps to use the EDG3UX71 USERMOD to update the IAT5210 message:

1. Install the USERMOD by using SMP/E.
2. Set the SETPARAM DSN option in the JES3 initialization deck to a value other than 0. For exit-selected scratch pooling, the EDG_EXIT100 installation exit depends on the data set name being included in the fetch-and-mount messages. Ensure that you have the DSN keyword coded on the JES3 SETPARAM statement in the initialization deck, and that the data set name length value is sufficient to provide selection control in the EDG_EXIT100 installation exit. The value is the length of the data set name to be included in mount messages and fetch messages that are issued by JES3.
   Recommendations:

   1. Set the data set name length to 9 if you use only the first qualifier for pooling.
   2. Set the data set name length to 31 if you want the EDG_EXIT100 installation exit to use the data set name for pool selection.

Result: The IAT5210 message is updated.