The ARCSAEXT installation exit receives control once for each data
set processed during volume space management or backup. As data sets
are migrated and backed up, the VTOC entry for each data set that processes
is copied into a VTOC copy data set. The VTOC copy data set contains
selected information from the DASD volume that is backing up
or migrating.
calls this exit for system- and non-system-managed data sets.
A flag in the data set VTOC entry (DS1SMSDS) is passed to the exit,
indicating whether the data set is system managed. provides
different parameter lists for system- and non-system-managed data
sets.
Note: This exit can be passed list and utility DSCBs,
but the DSCBs are not placed in the VTOC copy data set because these
data sets are not backed up or migrated. For more information about
list and utility data sets, see
z/OS DFSMShsm Storage Administration.
The ARCSAEXT exit is not called for any of the following data set
VTOC entries:
- ICF catalogs
- CVOLs
- VTOCs
- VTOC indexes
- VVDSs
For integrated catalogs, the exit is called for backup, but not
for space management.
The ARCSAEXT routine must be reentrant.