SDDLU Considerations

PC/3270 supports the self-defining dependent logical units (SDDLU) function of ACF/VTAM® Version 3 Release 4.1 (MVS) or Version 3 Release 4 (VM). SDDLU provides the ability to dynamically create dependent LUs on predefined PUs and to reconfigure dependent LUs without interruption to any other user on the network and without intervention by system programming or operations staff.

PC/3270 SDDLU is supported for all connections except DFT (coaxial connection).

PC/3270 network stations support SDDLU by:

Accepting a format-1 Activate PU (ACTPU), which signals that VTAM® requires a Network Management Vector Transport (NMVT) containing the Product Set ID (PSID) and LOCADDR of the LU.
Using LOCADDRs 02, 03, 04, and so on, in that sequence, by default. However, if you specify the LU addresses explicitly, it will use the addresses that you specify.
Sending an unsolicited NMVT to VTAM® when an LU switches on.