Hi, this might be a silly question but it is my 3rd day working in the voip world, thanks in advance. What exactly is the purpose of the subscriber, is is running parallel to the publisher and backing up everything?
"To maintain data consistency throughout the cluster, the publisher database server uses one-way or unidirectional replication to each subscriber. All information is stored on one server (the publisher server) and replicated to the other servers (subscriber servers) in the cluster. Replicating the SQL database is a core function inside teh CCM clusters.
Configuration changes on CCM systems are possible only while teh publisher server is available.
CCM writes information to the publisher database only if the CCM web components are installed o CCM Administration is performed directly on the publisher server. All entries that are made using the CCM Administration page of the subscriber are written to the database on the publisher server. If the publisher is down, no updates can be made in the CCMAdmin page of the subscriber server.
The publisher holds the only copy of the database that is allowed to be written to. All subscribers replicate with the database of the publisher only, so they are in read-only mode."
This info is taken from the Cisco IP Telephony book for the CCVP certification.