Systems enabled for sysplex communication and running in non–data sharing mode can share a database with other RACF® systems that are not enabled for sysplex communication. Systems that are not enabled for sysplex communication but that are sharing the database cannot exploit command propagation. In this mixed environment, the systems must not enter data sharing mode. Moreover, because the systems within the sysplex cannot be in the same MVS™ global resource serialization complex as the systems outside the sysplex, you must not replace hardware RESERVEs with ENQs. This means you must not place a generic entry for SYSZRACF in the RESERVE conversion resource name list (RNL). As is the case when all systems are members of the same sysplex, the major names SYSZRACF and SYSZRAC2 cannot be in the exclusion resource name list (RNL).