The Application Performance Score object defines the application traffic that will be monitored, and which application performance metrics should be evaluated providing application performance thresholds to be used in the evaluation.
For each metric, the observed traffic is compared against the threshold and is classified into one of three categories:
The number of good observations for all metrics with a threshold are totaled and given a full weighting; the number of tolerated observations for all metrics with a threshold are totaled and given a half weighting; all frustrated observations are given a 0 weighting.These weighted totals are summed and divided by the total observations.
aps = 10 * ((1 x number of satisfied samples) + (0.5 x number of tolerated samples) + (0 x number of frustrated samples)) / total samples
For HTTP, a threshold is configured for Network Delay as T = 300 msec and a threshold is configured for round-trip time (RTT) as T = 40 msec.
In one 10s period, 11 flows are sampled for HTTP with the following results:
The APS score is calculated as follows:
aps = 10 * ( 1 * (6 + 10) + 0.5 * (3 + 1) + 0 * 2) / 22 = 8.1
How are thresholds set?
The appropriate thresholds for an application is unique for each network environment. The thresholds can be set manually when configuring an APS object or the Exinda appliance can analyze the traffic for an application for a baseline period and create a recommended set of thresholds.
For more information about creating APS objects and setting the thresholds, read Configure Application Performance Score Objects.
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