The role placeholder represents a host role in an administrative domain.
admin | client | mediaserver
Specifies the host machine in your administrative domain that contains a copy of Oracle Secure Backup software and the catalogs that store configuration settings and backup history.
Specifies a host machine whose locally-accessed data are backed up by Oracle Secure Backup. Most machines defined within the administrative domain are clients.
Specifies a host machine that has one or more secondary storage devices, such tape libraries, connected to it.