An example of a multiple server configuration:
CentOS v5.3 x64
Intel (64 bit architecture)
1 GB Ram
80 GB RAID 1 configuration - SATA II 3.0 Gbps
Apache
Tomcat connector
CentOS v5.3 x64
Intel Q6600 Quad Core Processor or better
4 GB Ram
80 GB RAID 1 configuration – SATA II 3.0 Gbps
Tomcat