FAQS

1) How many VM create in per HOST
Depend upon the fact that we are using HA or not .
Look at the below link
http://www.vmware.com/pdf/vsphere4/r40/vsp_40_config_max.pdf
2) What are features in Vsphere compare with ESX3.5
Hot swap
VAPP
Profiles
Storage Vmotion
FT
etc.......
> Online Storage VMontion is possible in Vsphere.