Many thanks for you reply:
So to sumup:
1) In case of SQL Server High Availability: using VSpere 5.1 HA/FT is not the right solutions? It means to use the Cluster feature provided by Microsoft ?
2) When you write.....<in real world applications I rarely hear of anyone using it> do you mean for both the technologies: HA and FT?
3) You say that FT do not support more than 1 vCPU. But if I am not wrong, I have read that 5.1 support more than 1 vCPU. Correct?
4) .... Loosely coupled servers...... Please could you detailed?
Many thanks