Each RVG must have a Replicator Log associated with it. The Replicator Log volume at the primary site holds a copy of any data writes that are sent to the secondary site. The Replicator Log on the secondary site is held in reserve so that it can be used if the primary site becomes nonfunctional and the secondary site takes over the role of primary site. The logs at the two sites must have the same name; however, the sizes of the logs can differ. Veritas recommends having Replicator Log volumes of the same size at the primary site and the secondary site.