What adjustment is made to a VM’s memory settings when enabling vSphere Fault Tolerance?

When enabling vSphere Fault Tolerance, the memory settings of a virtual machine are adjusted in such a way that the memory limit is set to the default, which is unlimited. This allows the VM to utilize the full amount of memory allocated to it without any restrictions.

vSphere Fault Tolerance works by creating a secondary instance of a virtual machine that mirrors the primary instance. For this mirroring to be reliable and seamless, both instances need to have the same memory allocation to ensure continuous availability in the event of a failure. By setting the memory limit to unlimited, it guarantees that the primary VM has access to all of its allocated memory resources, ensuring that applications running on it can maintain performance and function correctly without being constrained by limits that could impede their operation. This setup is crucial because if the memory were to be limited, it could potentially cause issues during failover scenarios, compromising the effectiveness of Fault Tolerance.

Other options do not accurately reflect how memory settings are adjusted under Fault Tolerance. While limiting or altering memory allocation could lead to performance or operational issues, keeping it at unlimited ensures consistency and reliability across the primary and secondary VMs.