You can use DFSMShsm installation exits to customize DFSMShsm processing.

The DFSMShsm installation exits fall into two categories: exits that support basic DFSMShsm functions and exits that support DFSMShsm ABARS functions. This topic describes only the exits that support the basic DFSMShsm functions. For information about the DFSMShsm ABARS installation exits, see DFSMShsm ABARS Installation Exits.

Table 1 lists the installation exits that support the basic DFSMShsm functions.

Table 1. DFSMShsm Installation Exits

Module Name	Description	When Available	See Topic
ARCADEXT	Data set deletion exit	During data set deletion or data set retirement. Not called for SMS-managed data sets.	ARCADEXT: Data Set Deletion Installation Exit
ARCBDEXT	Data set backup exit	During volume backup, when a data set fulfills the selection criteria. Also during command backup of individual data sets.	ARCBDEXT: Data Set Backup Installation Exit
ARCCBEXT	Control data set backup exit	After DFSMShsm creates backup copies of the control data sets.	ARCCBEXT: Control Data Set Backup Installation Exit
ARCCDEXT	Data set reblock exit	During recall or recovery processing	ARCCDEXT: Data Set Reblock Installation Exit
ARCINEXT	Initialization exit	After DFSMShsm startup, before functional subtasks become active.	ARCINEXT: Initialization Installation Exit
ARCMDEXT	Space management exit	When a data set fulfills the selection criteria for the level 0 volume being managed, but before the data set migrates or transitions	ARCMDEXT: Space Management Exit
ARCMMEXT	Second-level migration data set exit	When a command or automatic selection process selects to migrate an already migrated data set.	ARCMMEXT: Second Level Migration Data Set Installation Exit
ARCMVEXT	Space management volume exit	After DFSMShsm completes processing at level 0 volume during volume space management.	ARCMVEXT: Space Management Volume Installation Exit
ARCRDEXT	Recall exit	During recall of non-SMS-managed data sets. Not called for SMS-managed data sets.	ARCRDEXT: Recall Installation Exit
ARCRPEXT	Return-priority exit	Before a recall, delete, or recover (data set or volume) request is queued.	ARCRPEXT: Return-Priority Installation Exit
ARCSAEXT	Space management and backup exit	Once for each data set processed during volume space management or backup.	ARCSAEXT: Space Management and Backup Installation Exit
ARCSDEXT	Shutdown exit	After DFSMShsm has received a shutdown command, or is shutting itself down because of some unanticipated condition.	ARCSDEXT: Shutdown Installation Exit
ARCTDEXT	Tape data set exit	When an output tape data set is opened during backup, migration, recycle, or tape copy processing.	ARCTDEXT: Tape Data Set Installation Exit
ARCTEEXT	Tape-ejected exit	When an input tape is required for recall, data set or volume recovery, data set or volume restore, or volume recycle processing.	ARCTEEXT: Tape-Ejected Installation Exit
ARCTVEXT	Tape volume exit	When a DFSMShsm-owned tape no longer contains valid data, and therefore becomes empty. This exit also supports tapes used in ABARS processing. See ARCTVEXT: Tape Volume Installation Exit for more information.	ARCTVEXT: Tape Volume Installation Exit