Application programs can act as either primary or secondary LUs. If the application program is the primary logical unit, you define pacing with two values: a nonzero value in SSNDPAC on the secondary LU-mode table entry and the pacing value on the VPACING operand of the APPL definition statement. In this way, you can pace normal-flow requests from another logical unit.

If the application program is a secondary logical unit, you define pacing with either value: a nonzero value in PSNDPAC on the secondary LU-mode table entry, or the pacing value on the VPACING operand of the secondary logical unit APPL definition statement. If you code both values, the nonzero value in PSNDPAC overrides the VPACING value.