You can turn on VMware Fault Tolerance through the vSphere Client.

Note

When Fault Tolerance is turned on, vCenter Server unsets the virtual machine's memory limit and sets the memory reservation to the memory size of the virtual machine. While Fault Tolerance remains turned on, you cannot change the memory reservation, size, limit, or shares. When Fault Tolerance is turned off, any parameters that were changed are not reverted to their original values.

Connect vSphere Client to vCenter Server using an account with cluster administrator permissions.

1

Select the Hosts & Clusters view.

2

Right-click a virtual machine and select Fault Tolerance > Turn On Fault Tolerance.

The specified virtual machine is designated as a Primary VM and a Secondary VM is established on another host. The Primary VM is now fault tolerant.