CSS 11506 page requests not directed properly

Question

CSS 11506 sitting in front of mainframe and
two Windows 2003 servers
content rule3056gif
add service web1
add service web2
vip address 10.10.200.252
balance aca
url "/IMAGE_DIRECTORY_NAME/*.gif"
port 3056
active
A small number of page requests, that do not match the above pattern, are passing to the content servers web1 or web2 instead of the mainframe.
Any ideas appreciated.

Answer 1

when a connection comes in and matches the rule above, a flow is created to switch all traffic between client and server.
If inside this same flow a new request comes in for a different content rule, the flow needs to be remapped to the new server.
This works fine except when the flow stays idle.
A flow that was idle can't be remapped.
All new requests will be sent to the current/last server even if the request does not match the rule.
The solution is to increase the idle timeout.
You can do this with a 'flow-timeout-multiplier'.
A large value will reduce a lot the chance to see the problem but it also means the amount of resources being used will increase as each flow will remain longer in memory.
It's up to you to find the right balance.
You can do a 'flow stat' from llama mode to see number of free flows and active flows.
I would say you start with a flow-timeout-multiplier of 100 and reduce or increase it if necessary.
Regards,
Gilles.
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