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Prince's avatar
Prince
Icon for Altostratus rankAltostratus
Aug 02, 2014

F5 LTM LOAD BALANCING

Hi All,

 

I have a VIP configured on F5 LTM and observing uneven traffic across the pool members. The load balancing method configured is round robin but the requests are going unevenly.

 

VIP has 4 servers: SERVER 1-- Observing High Traffic SERVER 2-- Observing High Traffic SERVER 3 -- Observing low traffic SERVER 4 -- Observing low traffic

 

Persistence value of 60 seconds is configured on the VIP. Each server has 3 instances in the pool and total requests going to each server are as below:

 

SERVER CURRENT CONNECTIONS

 

1 44

 

2 89

 

3 14

 

4 28

 

Please advise what is the best way to troubleshoot further on this?? How do I justify that the RR load balancing method is working fine?

 

Thanks in advance.

 

Regards, Vineet

 

application delivery
design
LTM

4 Replies

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  • Samir_Jha_52506's avatar
    Samir_Jha_52506
    Icon for Noctilucent rankNoctilucent
    Aug 03, 2014
    Hi Vineet, Because of persistence connection with oneconnect profile, it will show uneven traffic. So it is showing like this. If you want troubleshoot then reset 2nd server for some time. New session will be served to rest of the server.
  • Samir_Jha_52506's avatar
    Samir_Jha_52506
    Icon for Noctilucent rankNoctilucent
    Aug 03, 2014

    Hi Vineet, Because of persistence connection with oneconnect profile, it will show uneven traffic. So it is showing like this. If you want troubleshoot then reset 2nd server for some time. New session will be served to rest of the server.

     

  • LyonsG_85618's avatar
    LyonsG_85618
    Icon for Cirrostratus rankCirrostratus
    Aug 04, 2014

    Hi Vineet

     

    You may also want to read this:

     

    http://support.f5.com/kb/en-us/solutions/public/7000/700/sol7751.html

     

    The point being is if you give it a bit of time the pools should even out.

     

  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Aug 06, 2014

    So should I reach on a conclusion that CMP enabled with persistence ON will never make the load even on servers?

     

    i think it depends on traffic pattern. traffic can be evenly distributed when traffic volume is high enough and varying.