Having abundant physical memory in your system doesn't mean that your server process will get to use it. Operating systems can impose per-process limits, according to configuration values. See http://pic.dhe.ibm.com/infocenter/tsminfo/v6r3/index.jsp?topic=%2Fcom.ibm.itsm.srv.install.doc%2Ft_srv_startsrv.html about that in Unix systems, and the referenced Technote http://www-01.ibm.com/support/docview.wss?uid=swg21212174 for all OSes. Something to check for servers in general.
Richard Sims
