SMS considerations for DATA ACCELERATOR Compression
Your system must be running DF/SMS 1.2 or later on MVS/SP 4.3 or later.
The SMS component of DAC must be enabled.
DF/SMS Dataclasses that support compression and a compression technique must be assigned to DAC.
An SMS Dataclass can support compression if it has been defined with DSNTYPE=EXT and COMPACTION=Y.
Data sets requiring compression must be assigned to these Dataclasses by a system ACS routine, or explicitly in a job’s JCL.
Before compressing SMS data sets with DAC, make a list of the SMS Dataclasses that you intend to use and the compression techniques they support.
No REGISET entries are required for DATA ACCELERATOR Compression/SMS compression.