The DSMALTST option specifies whether or not the STGPCT runtime parameter will be honored.
DSMALTST=YES enables the use of the STGPCT runtime parameter.
DSMALTST=NO disables the use of the STGPCT runtime parameter. If DSMALTST=NO and STGPCT is passed as a parameter at run time, the STGPCT value will be validated and ignored.
The delivered default is YES.