Another ESX4 demo video this time introducing the new HA feature called F (Fault Tolerance) With this feature when a host fails a VM can continue working with 0 downtime. Ideal for mission critical servers, it works by creating a second mirror VM on another host, this VM’s are then kept in sync by sending commands from the active VM to the passive.
Virtualised Reality 
Did you hear about VMware FT? I just read a bit
about it on . Would u think that would
replace VMware HA? I had seen a video even of FT
on that link. Is it available yet?
http://www.virtualizationteam.com/virtualization-v
mware/vmware-esx-40-ft-fault-tolerant-sneak-peek.h
tml
Hi Andrew,
I don’t believe it will replace HA but will be an addition, it will allow you to fully protect a VM by duplicating it onto another server and then mirroring the updates. It is a potential new feature in VI4.
Cheers
Very interesting feature. In an environment our size, this has a fair number of applications. HA should remain to provide hardware tolerance for those less mission critical virtual machines.