Setting up a new ESX 3 server, here’s a good place to start with the type and size of your partitions.
Installing ESX is fast and simple. By default you could click through the installer GUI changing only your local time zone and end up with a stable, dependable host. However, there are some recommended partitioning best practices that should be followed in order to make sure you minimize possible future headaches and create a repeatable and scalable environment.
VM /ETC » Blog Archive » Best Practices for ESX Host Partitions