Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 179)

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User's Manual - 179
Below are the definitions of server roles:
1. CMS VAST server: The main access portal for the configuration.
1-1. CMS server is where the Failover configuration takes place.
1-2. CMS continuously polls to check the hearbeats to monitor the statuses of all
Active and Redundant servers.
1-3. CMS regularly backs up the configurations on Active servers.
1-4. CMS assigns redundant server(s) to the takeover of a failed Active server.
1-5. In a Redundant server configuration, the CMS is supposed to be up and running
at all time. If the CMS server fails, the server failover and failback operation will
not take place. It is therefore preferrable to configure a CMS redundant server,
and install the CMS server at a high up-time environment, such as on a VMWare
configuration.
3. Active servers: Active VAST servers are the work horses that perform recording and
monitoring tasks.
4. Redundant servers: The Redundant servers are actually active-standbys. They participate
to continue video recording in the event of active server failures. It is recommended for the
Redundant servers to have an equivalent or higher processing power than the Active servers.
The same applies to the size of storage volumes and the disk drives' write performance.
Note that you cannot configure a Redundant server by opening a local console.
2. CMS Redundant server: This is a failover server that serves as the backup for the CMS
server.
Note that this redundant server is configured in Settings > Devices > Sites . Click Add Sites ,
and select " Add as a redundant server for " " CMS ." See next section for the configuration
procedure.