You can have an already deployed Cassandra server in your environment or you can deploy a Cassandra container as part of the automated installation process.
Update the property values according to your environment.
You provide a comma-separated list of registry names of the vSphere Replication Cloud Service appliances and add a record for the Cassandra server as a property entry in the hcs-list.
Registry Entry for an Existing Cassandra Server
cassandra cass.0 address cassandra-address port 9042 ssh-password ssh-password hcs-list hcs.0,hcs.1,...,hcs.N
Registry Entry for Deployment of a Cassandra Container
cassandra cass.1 placement-docker docker-name port 9042 hcs-list hcs.0,hcs.1,...,hcs.N