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What are the bandwidth requirements for running a PRTG Cluster?

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Do you have guidelines or averages of bandwidth requirements for PRTG clustering? For example, an average of 10kbps per 1,000 sensors?

basics clustering prtg traffic

Created on Aug 26, 2010 10:28:41 AM by  Torsten Lindner [Paessler Support]

Last change on Sep 26, 2011 1:23:22 PM by  Daniel Zobel [Paessler Support]



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Bandwidth Usage in a PRTG Cluster

  • A PRTG cluster only transfers changes. If all sensors are up and running, and no objects are being edited, no data is transferred between the nodes of your PRTG cluster.
  • There is a Keep alive message from each node every 10 seconds, which does not scale with the sensor count, however.
  • On startup or if the nodes are out of sync, there can be a transfer spike when the whole configuration is sent to the other nodes (in a compressed form). You can have a look at the size of your non-compressed configuration file, but as this varies from user to user, it is impossible to name an exact number here.
  • If sensors go up or down, the status is broadcast to all other nodes. The traffic caused by this depends on the number of nodes.
  • If the core installation on one of the nodes is updated, the setup file (about 36 MB) is transferred to the other nodes to update them automatically.
  • When the reviewing of monitoring data includes different nodes, the required data (states, graphs, tables) is transferred from the other nodes to the one you are logged in to. Graphs in particular for which All nodes was selected can cause traffic peaks. This affects reports with an All nodes setting, too.
  • In a cluster, every PRTG node independently monitors the devices added to the Cluster Probe. Each of these devices sends monitoring data to every single cluster node. Depending on the number of nodes used, this causes extra traffic.
    Note: Especially when many WMI sensors are used, this can lead to extended traffic on the hosts.

Created on Aug 26, 2010 10:32:11 AM by  Torsten Lindner [Paessler Support]

Last change on May 8, 2019 5:13:31 AM by  Maike Behnsen [Paessler Support]



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What impact should we expect to see in a two node clustered setup on our monitored devices. Are we doubling the amount of SNMP operations that devices must performed, because they are being checked by each clustered node? What considerations has Paessler made for this?

Thanks! JZ

Created on Jul 31, 2014 10:23:36 PM by  jelyz (70) 1



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Yes, when running a cluster configuration, the SNMP queries are performed by both servers thus doubling the amount of SNMP traffic but this traffic is rather negligible and will only occur for those sensors which are underneath the Cluster Probe.

Created on Aug 1, 2014 12:29:07 PM by  Greg Campion [Paessler Support]



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