As mentioned, fault tolerance doesn't support 8 x vCPUs in 6.5 and no other technology listed can ensure 100% up-time except some other application / OS method (i.e. Windows Failover Cluster). * FT doesn't support 8 vCPU! * vSphere Standard and Enterprise. Allows up to 2 vCPUs * vSphere Enterprise Plus. Allows up to 4 vCPUs https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.avail.doc/GUID-57929CF0-DA9B-407A-BF2E-E7B72708D825.html