> From: David Brown [mailto:[EMAIL PROTECTED]
> Sent: 18 April 2008 12:00
> To: users@tomcat.apache.org
> Subject: Are there issues with running multiple instances of tomcat?
>
> We are currently running two instances of tomcat on our
> systems. One is for
> a vendor specific application and the other is for in-house written
> applications. We are careful to make sure the ports do not
> conflict and
> there are plenty of resources to support both; memory and CPU.
>
> Recently the statement has been made that the two instances
> can conflict
> with each other and cause issues and instability with the
> applications.
That sounds like classic FUD unless the person concerned can back it up. Who's
trying to pass the buck for a problem? The vendor or the in-house dev team? :-)
> Is this true? I was under the impression that since they are
> in their own
> JVM's neither tomcat would have any affect on the other. If
> there are issues in what form may they take place?
They'll compete for resources (notably disk i/o and the overall system cache),
but I'm not aware of any other issues. I've seen one big production site run
with three load-balanced Tomcats on one (big!) box, simply so that the
organisation could restart one Tomcat instance at a time for upgrades. I've
not heard of any resulting instability or issues, but the standard disclaimer
applies - it ain't my site, so I may not have heard everything!
- Peter
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