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numi_372246's avatar
numi_372246
Icon for Nimbostratus rankNimbostratus
Sep 17, 2018

question for load balancing

hi~

I have some problems configuring load balancing.
Device: BIG-IP 10250v
Environment: server1, server2, server3
Each server has 10 identical services, each using a different port.
service is web site(http)

server1 (xxx.xxx.xxx.011): ins0 8080, ins1 8081 ... ins9 8089,
server2 (xxx.xxx.xxx.012): ins0 8080, ins1 8081 ... ins9 8089,
server3 (xxx.xxx.xxx.013): ins0 8080, ins1 8081 ... ins9 8089,
L4: xxx.xxx.xxx.010: 8080 ... 8089
least connection load balancing

Load balancing testing with http request detected anomalies.
If you send 1 million http requests continuously for a certain time

The number of operations per instance group is similar, 
but the number of operations per server is significantly different.

ins0 (8080) group: 11%
ins1 (8081) group: 8%
...
ins9 (8089) group: 10%

The difference in the number of processes between each instance group is similar to 1-2%.

server1: 34%
server2: 41%
server3: 10%


    (instance group is Horizontal perspective, server group is Vertical perspective)
                   server1             server2              server3        sum
        ins0            19                  79                    9        11%
        ins1             x                   x                    x         8%
        ins2             x                   x                    x        10%
        ...              x                   x                    x        ..%
        ins9             x                   x                    x        11%
        sum             34%                41%                   10%        

However, the number of processes per server is very different.

What's the big difference?
application delivery
LTM
  • rob_carr's avatar
    rob_carr
    Icon for Cirrocumulus rankCirrocumulus
    Sep 18, 2018

    The number of operations per instance group is similar, but the number of operations per server is significantly different.

     

    What does the term 'operations' mean in this sentence? Are you referring to TCP connections, HTTP requests or CPU cycles (for example)?

     

  • rob_carr's avatar
    rob_carr
    Icon for Cirrocumulus rankCirrocumulus
    Sep 19, 2018

    How was your test setup? Did you have a pool for each service, with one instance from each of your three physical servers?

     

  • numi_372246's avatar
    numi_372246
    Icon for Nimbostratus rankNimbostratus
    Sep 21, 2018

    each physical server has ten instance. we have 3 physical server.

     

    We solved the problem with multiple tests.

     

    The problem was the session retention time. The four test PCs consistently generated http requests with a fixed IP address. However, with the session retention time of 300 seconds, the request was continuously transmitted only to the server that processed the initial request, and the load balancing could not be performed evenly.

     

    With continuous continuous requests, the session retention time was constantly maintained at 300 seconds This prevents load balancing to other servers until the server processing the request is stopped.

     

    We solved the problem to equalize load balancing by releasing session time(setting 0).

     

    thanks rob_carr