To create a striped extended-format sequential data set, specify the data class attribute, Data Set Name Type, as EXTENDED. You can require use of sequential data striping by setting Data Set Name Type to (EXTENDED,R). However, if striping is not possible, allocation fails.

You can request sequential data striping by setting Data Set Name Type to (EXTENDED,P). If striping is not possible, the data set is allocated as non-striped. SMS determines the number of volumes to use for a striped data set based on the value of the Sustained Data Rate in the storage class. Sustained Data Rate is the data transfer rate that DFSMSdfp should keep up during a period of typical I/O activity for the data set.

You cannot request sequential data striping with the JCL parameter, DSNTYPE. You need to use a data class with appropriate attributes.