To use ACS routines or exit selected scratch pooling, you must define messages IEC501A, IEF233A, IAT5110, and IAT5210 using the DFSMSrmm MNTMSG commands in parmlib as described in Defining mount and fetch messages: MNTMSG. These messages provide the pool identifiers to the operator, and the job name and data set name information to the EDG_EXIT100 exit.

The sample EDGUX100 exit module obtains the job name and data set name for a nonspecific volume request from the text of the message. This exit module includes the data set name only if the z/OS MONITOR DSNAME option is in effect. If you plan to use the sample EDGUX100 exit module, you must activate the z/OS MONITOR DSNAME option through an operator command. See z/OS MVS System Commands for more information about the z/OS MONITOR command.