Sonic Healthcare USA is using Red Hat, Vmware and Compellent SAN’s platforms within their infrastructure, complemented with a ZEVENET ADC to load balance TCP services and MySQL using ports 80, 443 and 3306. The configuration is composed by 3 farms per environment (8 environments in total) and 3 services per each farm with a concurrency of more than 5000 users.
So far so good. Some doubts configuring farm guardian but overall pleasant.