CSM : Strange Round-Robin behaviour

Hi,
During validation tests, I am observing a strange server selection behaviour, on independent GET requests (no cookie included) : When a connection request arrives in the CSM within a time window of about 20 seconds after the previous request, then the CSM correctly selects the next real server in the farm (round-robin). However, if the second connection arrives more than 20 sec after the previous request, the CSM selects the same server as for the previous one. Everything looks like the round-robin algorithm would be "reset" after this periood of time.
Is it a normal behaviour ?
By the way, how is the server list organized in the CSM RR algorithm ?
Thank you
Yves Haemmerli

Gilles,
As you requested, I send you the traces showing that when sessions are established with long delay between them, the round-robin load balancing is not consistent.
Here are some important infos :
- Client IP address is 141.122.142.197
- VIP address is 160.213.139.14
- We NAT the client with the VIP address
- Servers addresses are :
-> 160.213.139.163
-> 160.213.139.164
-> 160.213.139.165
-> 160.213.139.166
-> 160.213.139.171
-> 160.213.139.172
-> 160.213.139.173
-> 160.213.139.174
I ran two tests. Fore each of them I send you one trace showing the frames (HTTP on TCP port 26000)between the client and the CSM, and a second trace showing the frames between the CSM and the servers. In the trace, please forget about the HTTP code 401 returned by the servers). Also, note that the sessions are kept open by my session generator, in order to do the test.
In the first test, I sent 16 sessions in the raw without delay between them. Load balancing is perfect, each of the eight servers receives 2 sessions.
Than, I sent 16 sessions, one after the other, with several seconds between them. As you can see, the load balancing is uneven in this case.
I can't understand the behaviour as the GET requests in both tests are exactly the same...
Thank you for your help,
Yves Haemmerli

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              Torsten Jenkner wrote:
              > yes exactly Robert that's it!
              >
              > Torsten
              >
              > "Robert Patrick" <[email protected]> schrieb im Newsbeitrag
              > news:[email protected]...
              > > I don't understand this. Are you saying that with servlet node 1 or
              > servlet
              > > node 2 running by themselves that RR works fine but once you start both
              > > together, it does not?
              > >
              > > This sounds like a case for support...
              > > Robert
              > >
              > > Torsten Jenkner wrote:
              > >
              > > > > > it is always the same stub in our case. Also the round robin in the
              > EJB
              > > > > > cluster does with the same java classes but does not if the servlet
              > > > cluster
              > > > > > consits of two nodes. So it seems to be a configuration problem, but
              > > > which
              > > > > > one?
              > > > >
              > > > > Hmm.... I don't quite understand this last statement about the EJB
              > and
              > > > servlet
              > > > > cluster, could you explain a little more?
              > > > >
              > > > > Thanks,
              > > > > Robert
              > > > >
              > > >
              > > > if you use 2 servlet cluster nodes round robin between the
              > servlet-cluster
              > > > and the ejb-cluster doesn't work. if i kill the second servlet-node it
              > works
              > > > fine. so my thought was it has to be a configuration problem, because RR
              > > > does with one servlet-node. ok?
              > > >
              > > > Torsten Jenkner
              > >
              

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