ZCOMPRESS (NONE | ALL): Specifying whether to use zEDC Services for data sets

Explanation: ALL | NONE are mutually exclusive, optional subparameters of the ZCOMPRESS parameter, specifying whether or not to use zEDC Services during migration or backup.

Subparameter Explanation
NONE DFSMShsm does not use zEDC for a data set during migration or backup. DFSMShsm will use the SETSYS COMPACT settings.
ALL DFSMShsm will use zEDC during migration and backup, if this function is supported by the system. If zEDC Services are not available, DFSMShsm will use the SETSYS COMPACT settings to determine what type of software compaction is used for migration and backup.

SMS relationship: Parameter differs in meaning when applied to SMS-managed or non-SMS-managed DASD volumes or data sets.

SETSYS default: None.

DFSMShsm default: If you do not specify any subparameter of the ZCOMPRESS parameter on any SETSYS command, the DFSMShsm default is NONE and the SETSYS COMPACT settings will be used.
Note:
  1. DFSMShsm does not use zEDC for partitioned data sets.
  2. When you specify the ALL or NONE subparameter with the ZCOMPRESS parameter, DFSMShsm ignores all other subparameters.
Parent topic: Optional parameters of the SETSYS command