This image features a Xen showcase with an n-tier architecture that segregates the application server and the database server by placing them in different Xen domains. The figure shows a KDE screenshot from the Dom0 that displays the web application JPetstore (upper left), a VNC screen of this DomU and the tomcat application manager (upper right), the PostgreSQL database with the pgSQL console domain (lower right) and a terminal running xenconsole to monitor usage of the Xen virtual machines.