I recently replaced a couple of servers within a friends business with an oVirt virtualisation setup, I’m really pleased with the whole configuration which consists of a single engine host and 2 hypervisor nodes, the storage is shared over the 2 hosts with glusterfs. The guests which run on the platform replace the services that ran separately on a couple of physical servers, LAMP stack for intranet, Asterisk PBX, postfix/dovecot mailserver, squid proxy cache, Bind DNS, and DHCP server.