We are currently expanding our hosting to offer Joomla 1.5 / 1.6 / 1.7. I've noticed on the first few sites we've put up that most are running good, but before we start really expanding this service, I was hoping to get some guidance of setup.
2 ESXi Servers
Each Joomla install (1.5/1.6/1.7) has their own VM Host OS
Each has 2-4 GB RAM
Each is installed on Windows Server 2008 IIS7
Is this sufficient?