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JSpartan0901_95's avatar
JSpartan0901_95
Icon for Nimbostratus rankNimbostratus
Feb 21, 2012

Hybrid load balancing algorithm

Hi,

 

 

Is there any hybrid load balancing algorithm i.e., I would like a member in the pool to process a fixed percentage of requests and other members should use least connection count algorithm.

 

 

For example, if I have a pool of 4 members - host1, host2, host3 and host4. I want host4 to always process 10% of requests and the other three hosts should process remaining 90% of requests with least connection count algorithm.

 

 

If yes, how can I configure it?

 

 

Thanks!

 

 

-JS

 

application delivery
dev
devops
iRules

2 Replies

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  • Hamish's avatar
    Hamish
    Icon for Cirrocumulus rankCirrocumulus
    Feb 23, 2012
    Probably with an irule. You get complete control then. Use a table to count and assign the pollmember appropriately. Although member weightings might get close.
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Feb 23, 2012
    200.200.200.222 is a fake pool member (not existing). this only works with round robin lb method. when using ratio lb method and giving 200.200.200.222 ratio 2, connection gets stuck with it which is finally sent to 200.200.200.111. i guess counter (ratio) might have some problem when doing LB::reselect. 

    [root@ve1023:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
}
[root@ve1023:Active] config  b pool foo list
pool foo {
   members {
      200.200.200.101:80 {}
      200.200.200.222:80 {}
   }
}
[root@ve1023:Active] config  b pool foo111 list
pool foo111 {
   members 200.200.200.111:80 {}
}

[root@ve1023:Active] config  b rule myrule list
rule myrule {
   when LB_SELECTED {
   if {[IP::addr [LB::server addr] equals 200.200.200.222]}{
      LB::reselect pool foo111
   }
}

when SERVER_CONNECTED {
   log local0. "[IP::client_addr]:[TCP::client_port] -> [IP::local_addr clientside]:[TCP::local_port clientside] -> [IP::remote_addr]:[TCP::remote_port]"
}
}

[root@ve1023:Active] config  cat /var/log/ltm
Feb 23 05:59:11 local/tmm info tmm[4797]: Rule myrule : 172.28.19.251:46204 -> 172.28.19.79:80 -> 200.200.200.111:80
Feb 23 05:59:13 local/tmm info tmm[4797]: Rule myrule : 172.28.19.251:46205 -> 172.28.19.79:80 -> 200.200.200.101:80
Feb 23 05:59:16 local/tmm info tmm[4797]: Rule myrule : 172.28.19.251:46206 -> 172.28.19.79:80 -> 200.200.200.111:80
Feb 23 05:59:17 local/tmm info tmm[4797]: Rule myrule : 172.28.19.251:46207 -> 172.28.19.79:80 -> 200.200.200.101:80