VMware Certified Professional - Data Center Virtualization (VCP-DCV) Practice Exam

What condition could explain an error when trying to enable Enhanced vMotion Compatibility (EVC) on ESXi hosts?

1. The ESXi hosts are not licensed for EVC.

2. The administrator lacks privileges to enable EVC.

3. The ESXi host CPU has the Intel No-Execute feature disabled.

4. The administrator turned on Intel Virtualization Technology.

The correct answer is: The ESXi host CPU has the Intel No-Execute feature disabled.

Enhanced vMotion Compatibility (EVC) is a feature in VMware that allows virtual machines to migrate between ESXi hosts with different CPU capabilities while ensuring compatibility. For EVC to function correctly, it is essential that the CPUs of the participating hosts support the necessary features. The presence of the Intel No-Execute (NX) feature, also known as the XD (Execute Disable) bit, can be a critical factor. If this feature is disabled on the CPU of the ESXi host, it may lead to compatibility issues that prevent EVC from being enabled. This is because one of the requirements for EVC is that the CPUs must support certain hardware features to maintain consistency and allow for seamless migration of virtual machines. Disabling NX can create scenarios where the necessary instruction sets or security features expected during EVC operations are not available, resulting in an error when attempting to enable this feature. In contrast, other conditions, such as licensing issues or administrator privileges, while they can lead to problems, do not pertain to the specific compatibility requirements of the CPU that EVC enforces. Additionally, the enabling of Intel Virtualization Technology is typically unrelated to EVC functionality, as it is more about facilitating virtual machine operations rather than influencing EVC's CPU feature requirements