In a star complex, the Resource Name Lists (RNLs) are maintained on the sysplex couple data set. The RNLs are initialized by the first system to join the sysplex. All subsequent systems will read this data from the sysplex couple data set and compare it to the version used during system initialization. RNLs are specified using the GRSRNL= parameter in the IEASYSxx member of parmlib. If the RNLs used by the system during initialization do not match those in the sysplex couple data set, MVS™ issues message ISG312W and the system is put into an X'0A3' wait state.