A setting for APPC LUs and modes that enables LU-LU pairs (with assigned modes) to be generated automatically by Host Integration Server 2004. Each time a new APPC LU or mode is created with automatic partnering enabled, Host Integration Server 2004 searches for existing LUs and modes that also have automatic partnering enabled. Host Integration Server 2004 then uses all available automatic partners to create as many unique LU-LU pairs as possible, each pair containing a remote LU, local LU, and assigned mode. Disabling an automatic partner setting after an LU or mode has been created does not remove that LU or mode from LU-LU pairs already generated.