Four installation exits are used by aggregate backup if they are accessible to the LOAD macro and if SETSYS EXITON(ARCM2EXT), SETSYS EXITON(ARCBEEXT), SETSYS EXITON(ARCTVEXT), and SETSYS EXITON(ARCEDEXT) commands have been issued. (You can use the QUERY SETSYS command to display the status of these exits.)
ARCM2EXT is called by aggregate backup when a data set on an ML2 volume is encountered, and it allows you to specify if the data set should be skipped or included in the aggregate backup.
ARCBEEXT allows you to specify if the data set should be skipped so that the aggregate backup can complete successfully, or if it should be included in the aggregate backup and cause aggregate backup to fail.
ARCEDEXT is called to allow you to specify a tape volume expiration date other than 99365 for the aggregate backup output files.
For more information about installation exits, see z/OS DFSMS Installation Exits.