A replication ring is a set of identical processes running on all nodes in the cluster.
The basis of clustering is the replicated database (RDB). An instance of the RDB is maintained on each node in the cluster. Several processes use the RDB to ensure consistent data across the cluster. The processes include the management application (mgmt), volume location database (vldb), virtual interface manager (vifmgr), SAN management daemon (bcomd), and configuration replication service (crs).
For instance, the vldb replication ring for a given cluster consists of all instances of vldb running in the cluster.
RDB replication requires healthy cluster links among all nodes in the cluster. If the cluster network fails in whole or in part, file services can become unavailable. The advanced command cluster ring show displays the status of replication rings and can assist with troubleshooting efforts.