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RH's avatar
RH
Icon for Nimbostratus rankNimbostratus
Jan 27, 2015

Overflow towards another pool

We have 3 different virtual servers and three pools where traffic is redirected too. They all have the same function but for reporting purpose they are separated. Is there a way to let traffic overflow towards another pool when a maximum of connections are reached on the nodes ? That way I could use (a pool) separate nodes for overflow purposes for all three pools mentioned above. I found that Priority Group Activation could be used, but then I need to create one big pool (or three separate) and add all nodes. Does anyone know a way to achieve this ? Hope the situation is clear, if not please let me know.

 

application delivery
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design
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overflow

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  • StephanManthey's avatar
    StephanManthey
    Icon for MVP rankMVP
    Jan 27, 2015

    Hi,

     

    using a large pool with members set to three different priorities and connection limit per pool member would probably be the easiest approach. Be careful with handling of persistent connections and use the connection limit override option. For reporting purposes you can still use the individual pool member statistics.

     

    Thanks, Stephan

     

  • RH's avatar
    RH
    Icon for Nimbostratus rankNimbostratus
    Jan 27, 2015

    Dear Stephan,

     

    Thanks for your reply.

     

    You state that this is the easiest approach, so I can assume the possibility to overflow to another pool doesn't exist ?

     

    Regarding the connection limit, the nodes also have other functions. But it's on different ports, does the connection limit only apply to the pool member (node) you set it on, or will it count connections for other pools/ports as well ?

     

    • StephanManthey's avatar
      StephanManthey
      Icon for MVP rankMVP
      Jan 27, 2015
      Hi, there is no kind of build-in feature except the connection limit configuration. An alternative would be counting current connections in a table and evaluating it with every new incoming connection to decide about using the overflow pool resource. But that´s far more effort. Depending on setting connection limits on node (counting for all pool members using it) or on pool member (counts for connections only of pool it belongs to). Thanks, Stephan