ZCOMPRESS (DASDMIGRATE (NO | YES)) : Specifying whether to use zEDC Services for data sets during migration to DASD

Explanation: DASDMIGRATE (NO | YES) are mutually exclusive, optional subparameters of the ZCOMPRESS parameter, specifying whether or not to use zEDC Services when DFSMShsm migrates to DASD.

Subparameter Explanation
DASDMIGRATE (NO) DFSMShsm does not use zEDC for a data set migration to DASD. DFSMShsm will use the SETSYS COMPACT settings.
DASDMIGRATE (YES) DFSMShsm will use zEDC Services during migration to DASD, if this function is supported by the system. If zEDC is not available, DFSMShsm will use the SETSYS COMPACT settings to determine what type of software compaction is used for migration.

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 either subparameter on any SETSYS command, the DFSMShsm default is DASDMIGRATE(NO).
Note:
  1. If you do not want a specific data set to be compressed with zEDC during volume migration to DASD, use the data set migration exit (ARCMDEXT) to prevent compression.
  2. As compressed-format data sets are already compressed, they are not compressed with zEDC Services during migration to DASD.
Parent topic: Optional parameters of the SETSYS command