The Volume Replicator replicates the data that may be present on one or more Storage Foundation (SFW) volumes. This set of volumes on a Volume Replicator-managed host is called a Replicated Volume Group (RVG).

An RVG is always associated with a SFW disk group. The disk group can consist of volumes. All related volumes must always be a part of the same RVG. Unrelated volumes must not be grouped together in an RVG. Multiple RVGs can be configured inside one disk group.

The RVG is the unit of replication. Set of volumes on a host that need to be replicated are grouped under an RVG and are referred to as the Primary RVG. The destination host to which the volume data needs to be replicated, also has a similar setup as the Primary RVG to maintain consistency. This volume group on the destination host is referred to as the Secondary RVG.

The updates to the volumes in an RVG on the Primary host are also sent to its Secondary hosts. Access to the data volumes on the Secondary hosts is not allowed when replication is active.

Volumes that are associated with an RVG and contain application data are called data volumes. Data volumes are replicated Storage Foundation volumes and are distinct from the Replicator Log volume. The data volumes in an RVG may be under the control of an application such as a Database Management System that expects write-order fidelity to be maintained for the updates to the volumes during replication to ensure that each remote volume is always consistent, both internally and with all other volumes of the RVG.