SAS supports extended-format
VSAM data sets. These data sets are managed with SMS, and they are
defined as extended format with the data class DSNTYPE=EXT parameter
and sub-parameters.
Extended-format data
sets are the basis for many new VSAM functions, such as data striping,
host data compression for key-sequenced data sets, system-managed
buffering, and extended addressability for data sets greater than
4 gigabytes in size.
See the IBM DFSMS documentation
for information about defining these functions to SMS and for any
restrictions for using these functions.