Sizing is the most important part before ESX implementation.
I’m using the Hp Vmware solution sizer as first step before VMware infrastructure implementation.
You can run it from here : http://g3w1656g-vip.houston.hp.com/SB/VMware/page_init.asp
This is an automated tool that assists the user with the size and scope of a server environment supporting VMware. The sizing information and algorithms have been developed using testing and performance data on HP Servers running the VMware ESX Server.



