This topic defines terms for the XRC data sets. An XRC system requires one of each of the state, control, and journal data sets. A coupled XRC system requires a single master data set in addition to each of the state, control, and journal data sets per XRC subsystem. If a cluster session is to be used to couple XRC sessions in a logical partition, you require a cluster control data set. You can also optionally specify a cluster monitor data set.