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Home > Success Center > User Device Tracker (UDT) > UDT Administrator Guide > Manage SolarWinds UDT polling engines > Calculate node availability

Calculate node availability

Created by Steven Bansil_ret, last modified by Steven Bansil_ret on Jan 27, 2017

Views: 46 Votes: 0 Revisions: 2

The Availability Calculation setting on the Polling Settings view provides a choice between the following two methods for determining device availability.

Node Status

The default method is based upon the historical up or down status of the selected node. The selected node is polled for status on the Default Node Poll Interval defined on the Polling Settings view. For more information, see Orion Platform polling settings.

If the selected node responds to a ping within the default interval, the node is considered up, and a value of 100 is recorded in the Response Time table of the Orion Platform database. If the node does not respond to a ping within the default interval, the node is considered down and a value of 0 is recorded in the Response Time table of the Orion Platform database. To calculate node availability over a selected time period, the sum of all Response Time table records for the selected node over the selected time period is divided by the selected time period, providing an average availability over the selected time period.

Percent Packet Loss

The second method is a more complicated calculation that effectively bases the availability of a selected node on its packet loss percentage. As in the Node Status method, the selected node is polled for status. If it responds within the Default Node Poll Interval defined on the Polling Settings view, a value of 100 is averaged with the previous 10 availability records.

The result of the Percent Packet Loss calculation is a sliding-window average. To calculate node availability over a selected time period, the sum of all results in the Response Time table for the selected node over the selected time period is divided by the selected time period, providing an average availability over time.

The Percent Packet Loss method introduces a historical dependency into each availability node record. In general, it is best to leave calculations based on Node Status unless you specifically need node availability based on packet loss.

 
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