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Thiyagu_163984's avatar
Thiyagu_163984
Icon for Nimbostratus rankNimbostratus
May 28, 2015

timeout value of health monitoring

Hello All, I'm trying to understand more about the timeout value of health monitoring.

 

For example if the probe interval is set to 15 seconds and timeout is set 46 sec and now the server is down: 1- How long LTM will take to give up the node is down? 2- does the LTM keeps forwarding the traffic to the failed node till 46 seconds? 3- what is the best practice of timeout value need to configured?

 

Regards, Thiyagu

 

1 Reply

  • amolari's avatar
    amolari
    Icon for Cirrostratus rankCirrostratus
    May 29, 2015
    1. 46 seconds
    2. yes. When LTM sees the pool member down it won't send new connections to that backend. Active/persisted connections are handled differently (see option "Action on service down")
    3. depends on your application and keeping a good balance between "reactivity" to such an event and overwhelming the backend with monitor requests. Good practice is what F5 recommends (if I remember.. should be in their KB): timeout = 3x interval + 1