Getting stuck in the first place (ACE)

[normbeef]

Hi ,

I have a quick question :

we have an ACE loadbalancer that is using a least load predictor based on CPU values of 2 rservers :

We only ever have 4 source addresses that connect inbound to the VIP. 

We are seeing that the sticky database keeps sticking 3 entries to one of the servers and 1 on the other,  so the Load balancer is struggling to keep the load even..  (after they are stuck)

My question is    whats is the decision based on to stick the initial connections coming inbound ???     I assume that it uses the least loaded predictor ??

[sivaksiv]

Hi,

Thats correct, the initial decision would be based on predictor leastconns.

Regards,Siva

[normbeef]

hi sivaksiv, 

Thanks for the reply...   

I wonder if you can help on the following output....   I see that there are actually 5 sticky sessions (but only 4 possible IP source addresses)   the ACE from time to time ages one of these out  but only to box  v04  ???? 

you can see below that no new connections are being sent to  sticky entry -  168105287

sticky group : xxxxxx.xxxxxxx-stickygroup

type         : IP

timeout      : 30            timeout-activeconns : TRUE

  sticky-entry          rserver-instance                 time-to-expire flags

  ---------------------+--------------------------------+--------------+-------+

  168165518             appv03:0                1777           -

sticky group : xxxxxxxxx-stickygroup

type         : IP

timeout      : 30            timeout-activeconns : TRUE

  sticky-entry          rserver-instance                 time-to-expire flags

  ---------------------+--------------------------------+--------------+-------+

  168165522            appv03:0                1795           -

sticky group : xxxxxxxxxx-stickygroup

type         : IP

timeout      : 30            timeout-activeconns : TRUE

  sticky-entry          rserver-instance                 time-to-expire flags

  ---------------------+--------------------------------+--------------+-------+

  168105287             appv04:0                1284           -

sticky group : xxxxxxxxxxx-stickygroup

type         : IP

timeout      : 30            timeout-activeconns : TRUE

  sticky-entry          rserver-instance                 time-to-expire flags

  ---------------------+--------------------------------+--------------+-------+

  168165523             appv03:0                1752           -

sticky group : xxxxxxxxxx-stickygroup

type         : IP

timeout      : 30            timeout-activeconns : TRUE

  sticky-entry          rserver-instance                 time-to-expire flags

  ---------------------+--------------------------------+--------------+-------+

  168165517            appv04:0                1795           -

[Cesar Roque]

Hi,

Did you try using roundrobin?  that probably should give you a more fair loadbalance

---------------------
Cesar R
ANS Team