You can convert your control data sets to extended addressability for use with either CDSQ or CDSR serialization. You must ensure that the EA control data sets are SMS-managed and are assigned to a DATA CLASS that specifies extended format and extended addressability.

The allocation of the EA CDS and the copying of the contents of the existing CDS is a one time process. Use the IDCAMS DEFINE CLUSTER command to allocate the EA CDS. Then use the IDCAMS REPRO command to copy the contents of the existing CDS to the newly allocated CDS.