Smarts SAM/IP: How is the "Certainty" field calculated for Smarts SAM and Smarts IP events?
search cancel

Smarts SAM/IP: How is the "Certainty" field calculated for Smarts SAM and Smarts IP events?

book

Article ID: 304190

calendar_today

Updated On:

Products

VMware

Environment

VMware Smart Assurance - SMARTS

Resolution

How is the Certainty field calculated for Smarts SAM and Smarts IP events?
Is it possible to have a Certainty value of less than 100% for a Smarts root cause event?




Every problem in Smarts is declared with a set of symptoms. Depending on how many symptoms are active for a problem, the Smarts codebook calculates a Certainty value. The Certainty calculation also depends on the shared symptoms between the problems.

Smarts uses a complex algorithm that governs the calculation in which it essentially answers the following questions:

  1. Which problems are relevant to be diagnosed?
     
    • Router Unresponsive
    • MightBeDown¬†
    • PeerDownorFlapping
    • Neighboring system down or Flapping

       
  2. What is the minimal set of symptoms that these problems cause?
  3. What is Apriori Probability? (Apriori is a classic algorithm for learning association rules).