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Home > Success Center > Server & Application Monitor (SAM) > SAM 6.4 Administrator Guide > Manage Orion polling engines for SAM > Calculate node availability for SAM

Calculate node availability for SAM

Updated: 3-9-2017

Determine the availability under Orion Polling Settings > Calculations & Thresholds > Availability Calculation by using one of the following methods.

Node Status

The default method is based on 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 Orion Polling Settings view.

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 view. 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 view.

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. This provides an average availability over the selected time period.

Percent Packet Loss

This method is a more complicated calculation that bases the availability of a selected node on its packet loss percentage. The selected node is polled for status. If it responds within the Default Node Poll Interval defined on the Orion 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. This provides an average availability over time.

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

 
Last modified
13:37, 20 Mar 2017

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