Does Datacom support allocating large format sequential data sets greater than 65,535 tracks with DSNTYPE=LARGE?
Datacom/AD 14.0 and higher
Datacom supports the use of large format sequential data sets which can be larger than 65,535 tracks (4369 cylinders) per volume.
Allocate a large format data set by using the DSNTYPE=LARGE parameter on the DD statement in the JCL.
However, extended format data sets defined with DSNTYPE=EXT, DSNTYPE=EXTREQ or DSNTYPE=EXTPREF are not supported because they cannot be accessed using the EXCP access method which is used by Datacom.