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egarrison_17852's avatar
egarrison_17852
Icon for Nimbostratus rankNimbostratus
Jan 05, 2015

Use a Pool server only on Failure

I am trying to setup an iRule or Pool that has 2 servers that are primary. They take the traffic, but if one fails, then it goes to a 3rd server. The 3rd server is older and slower, so I only want traffic if 1 or 2 fail. I tried priority settings, but seem to keep getting sessions on the 3 server. My VIP is defined via iAPP.

 

What is the best way to do this?

 

application delivery
availability
devops
iApps
iRules
performance

3 Replies

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  • Amit_Karnik's avatar
    Amit_Karnik
    Icon for Nimbostratus rankNimbostratus
    Jan 05, 2015

    The priority activation should be the right approach in this case.

     

    1. Make sure pool member 1 and member 2 have the higher priority , let say "5"
    2. The pool member 3 should have lower priority, lets say "1"
    3. Make sure the "Priority Group Activation" in the Pool Members screen is set to "Less than" "1"

    Best

     

  • egarrison_17852's avatar
    egarrison_17852
    Icon for Nimbostratus rankNimbostratus
    Jan 05, 2015

    I was missing the Priority Group Activation settings. That is likely why I kept getting a little traffic over on 3. I had the high priority, but it seemed like it was ignored sometimes.