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

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If a virtual machine is not showing signs of ballooning or swapping, what is a likely contributing factor?

  1. The VM has no virtual CPUs allocated

  2. The VM has a 100% memory reservation

  3. The VM is powered off

  4. The VM has a low number of CPU shares

The correct answer is: The VM has a 100% memory reservation

When a virtual machine has a 100% memory reservation, it means that all of its allocated memory is guaranteed and will not be reclaimed by the hypervisor, regardless of the overall demand for memory from other virtual machines. This reservation ensures that the VM has dedicated memory resources available at all times, preventing situations where memory ballooning or swapping would occur. Ballooning is a technique where the hypervisor reclaims memory from running virtual machines when the host is low on memory, and swapping involves moving memory pages to disk when there is insufficient RAM. Since the VM is fully reserved, it is insulated from these resource reclamation techniques, as the hypervisor sees no need to reclaim memory that has already been set aside for it. Therefore, the presence of a 100% memory reservation is a strong indicator that the VM will not exhibit ballooning or swapping behavior. This is fundamentally different from scenarios where other options, such as having no CPU allocated or being powered off, would influence the performance and resource visibility of the VM in different ways, but would not directly relate to the concepts of ballooning and swapping as much as memory reservation does.

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