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From Antonio Fiol Bonnín <fiol.bon...@terra.es>
Subject Re: Production server tuning
Date Wed, 30 Jul 2003 17:44:14 GMT
Kwok Peng Tuck wrote:

> I'm no expert in load balancing and stuff like that, but shouldn't you 
> load balance tomcat as well ? 


If I could do everything I wanted to...

No. I am trying, but I cannot do that yet. Budget is not ready and 
purchase timings are far too long.

Thanks anyway.

Antonio



>
>
> Antonio Fiol Bonnín wrote:
>
>> Hello,
>>
>> We have already gone live, and we actually spend too much time dead. 
>> I hope some of you can help me a bit about the problems we have.
>>
>> Architecture:
>> 3 Apache web servers (1.3.23) behind a replicated load balancer in DMZ
>> 1 Tomcat server (4.1.9) behind firewall, in "secure" zone.
>> 1 Firewall in between.
>>
>> Some facts I observed:
>> - Under high load, server sometimes hangs from the user's point of 
>> view (connection not refused, but nothing comes out of them.
>> - Under low load, I "netstat" and I still see lots of "ESTABLISHED" 
>> connections between the web servers and the Tomcat server.
>>
>> For the first case, I reckon I might have found the cause:
>> Apache MaxClients is set to 200, and Tomcat maxProcessors was set to 
>> something about 150. Taking into account that there are 3 Apache, 
>> that means 200 x 3 = 600 clients --> tomcat chokes. Just raised 
>> maxProcessors to 601 ;-)
>>
>> For the second one, I have really no clue:
>> Apache MaxSpareServers is set to 10. I see more than 30 "ESTABLISHED" 
>> connections even with extremely load.
>>
>> Could someone point me to either
>> - a solution (or part thereof, or hints, or ...)
>> - a good tomcat tuning resource
>> ?
>>
>> I hope I can find a solution for this soon... The Directors are 
>> starting to think that buying WebLogic is the solution to our 
>> nightmares. They think they only need to throw money at the problem. 
>> Please help me show them they are wrong before they spend the money.
>>
>> Thank you very much.
>>
>> Antonio Fiol
>
>
>
>
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