|Accessing VSAM Data Sets|
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 on defining these functions to SMS and for any restrictions for using these functions.