To get a clearer picture here's how things are configured.
Users hit a content switch that round robbins to 3 redhat servers each running apache web server. Those web servers reference another machine running 1 instance of jboss which has the maxconnections set to 1000 in the jbossweb-tomcat41.sar/META-INF/jboss-service.xml. This instance of jboss points to another server running Sybase dataserver.
How many simultaneous users will this handle?
version information if necessary:
$ /usr/sbin/httpd -version
Server version: Apache/2.0.46
Server built: Nov 5 2004 10:58:21
jboss-3.2.3 ( tomcat came with this version of jboss. Not sure of the tomcat version)
Redhat LInux ASE 3
Sybase ASE 12.5.3