The ISTPDILU major node contains CDRSC definitions for independent LUs that are converted by VTAM® from LU definition statements. In converting the independent LU to a CDRSC, VTAM removes the implied hierarchy of the independent LU to a type 2.1 physical unit.

The converted CDRSCs can be used with multiple connections between a type 2.1 node and a subarea node. For this reason, the individual CDRSC minor nodes that are converted from LU definitions are not freed when the NCP (or other major node) in which they were originally defined is deactivated.

However, you can delete individual CDRSC minor nodes without deleting the entire major node. You can use the DELETE operand on the VARY INACT command on predefined CDRSC minor nodes.

When the LU definition statement is converted, the resource is represented as a CDRSC. This means that if the OWNER operand is specified on the LINE definition statement where the independent LU is predefined, it has no effect on the independent LU being converted to a CDRSC. The independent LU is converted to a CDRSC, but the PU under which it is predefined cannot be used as a session path until it is acquired by that host.