Is the Fault Tolerance option in vSphere4 Operating System dependant, or would it work on all versions of Windows?
It’s independent from the OS type…in fact, you can enable FT on a blank VM without an OS installed in the first place
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You can also refer this document for FT best practices
But actually onli few OSes are supported to run in FT VM. Others can run I suppose, but you won't have guarantee.
MCSA, MCTS, VCP, VMware vExpert '2009