DINRSTCL requests the storage class of the specified SMS-managed data set. When you code DINRSTCL, # must be 1, LEN must be at least 8 and can be longer, and the PARM field must be the length specified by the value in LEN.
If a storage class is associated with the data set, the system returns the storage class identifier into PARM. If the identifier is fewer than 8 bytes long, it is left-justified and padded to the right with blanks. The system also returns 8 into LEN.
KEY # LEN PARM
C004 0001 0008 - - - - - - - -