Specifying whether to reset the data-set-changed indicator

You can specify whether to reset the data-set-changed indicator on changed data sets when dump processing is performed to a specific dump class. If the dump operation resets the data-set-changed indicator, the data sets are not backed up by the next incremental backup operation unless the data set is changed after the dump occurs. If volumes are being dumped to multiple dump classes and you indicate in any of the dump classes that the indicator is to be reset, the indicator is reset whenever volumes are dumped to that dump class. If the dump copy is the most-recent backup copy of a data set and the data-set-changed indicator is reset, the most-recent backup copy can be lost if the dump copy expires automatically.

The RESET subparameter of the DUMPCLASS parameter controls whether the data-set-changed indicator is reset. If you intend to use incremental backup copies to update volumes restored from dump copies, you should use the NORESET option of this subparameter. You are going to use the incremental backup copies to update restored volumes; therefore, you can change the DEFINE DUMPCLASS command as follows:

DEFINE DUMPCLASS(ONEWEEK AUTOREUSE -
DATASETRESTORE FREQUENCY(7) NORESET)
DEFINE DUMPCLASS(TWOWEEK NOAUTOREUSE -
NODATASETRESTORE FREQUENCY(14) -
DISPOSITION('SEND OFFSITE BIWEEKLY') -
NORESET)
DEFINE DUMPCLASS(FOURWEEK NOAUTOREUSE -
NODATASETRESTORE DAY(28) -
DISPOSITION('SEND OFFSITE MONTHLY') -
NORESET)

Note: You cannot specify RESET if the dump class is used for copy pool processing.

You can specify whether the data-set-changed indicator in the VTOC entry, DS1DSCHA, is reset for all data sets that are restored during full volume recover processing, using the RECOVERRESET subparameter of the DUMPCLASS parameter. The data-set-changed indicator indicates whether or not the data set has changed since its last backup. RECOVERRESET(YES), the default, species that the data-set-changed indicator is reset (set to OFF) for all data sets on the volume being recovered. RECOVERRESET(NO) species that the data-set-changed indicator is not reset. This option indicates that the data-set-changed indicator setting retains the value the data sets had when dumped. RECOVERRESET(DUMP) specifies that if the RESET keyword was specified in the dump class at the time the dump was created, the data-set-changed indicator is reset for all data on the volume being recovered, unless RESET was not specified, NORESET was specified, or the dump copy was created prior to z/OS V2R1 DFSMShsm. Note that DUMP is not applicable for fast replication recovery because RESET cannot be specified in dump classes associated with the FRBACKUP function. For dump classes used during fast replication recovery processing, specify either YES or NO.