First what is the best way to install Sphinx on a centOs server
rpm -ivh http://sphinxsearch.com/downloads/accept.php?file=sphinx-2.0.6-1.rhel6.x86_64.rpm yum install sphinx
didn't seem to work.
Also, my set up is one app server, and one database server. The app server runs Magento, where it has the new module the works with Sphinx but, it's unclear both on Sphinx docs as well as any google searches, which server Sphinx should be installed on for the best effect.