VMware FT vs VMware HA. Fault Tolerance guarantee zero downtime but HA still comes with some downtime. HA load balancer or hypervisor, to detect a problem and restart the VMs can add up to minutes or even hours. FT keeps VM copies on a separate host machine. With only HA configured, the hypervisor attempts to restart the VM on the same host cluster. With FT, the VM workload is moved to a separate host.
VMware’s Fault Tolerance (FT) and High Availability (HA) protect virtual machine (VM) operation in the event of an ESX/ESXi host failure. Fault-tolerant instantly move to a new host but high-availability HA cannot prevent VM failure it will see the VMs fail with the host before restarting on another host. Fault tolerance mean you don't lose the in-memory application state in the event of a failure such as a host crash. Fault Tolerance is much harder than high availability in a virtual environment.
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