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

For an ESXi host showing high CPU ready time, which configuration might need adjustment?

1. Increase the number of physical NICs

2. Decrease the number of virtual machines hosted

3. Adjust CPU reservations for VMs

4. Add additional storage to the host

The correct answer is: Adjust CPU reservations for VMs

High CPU ready time is an indicator that virtual machines (VMs) are waiting longer than expected to be scheduled on the physical CPU resources of the ESXi host. This situation often arises when the available CPU resources are insufficient to meet the demands of the VMs running on that host. Adjusting CPU reservations for VMs directly influences CPU resource allocation. Reservations guarantee a specific amount of CPU resources for a VM, ensuring that it can access the CPU it requires when needed. By adjusting the reservations, you can prioritize certain VMs over others or allocate additional resources to those that are underperforming due to high CPU ready times. This adjustment helps mitigate contention for CPU resources, ultimately reducing the CPU ready time and enhancing overall performance. Other configuration adjustments can have effects, but they may not address the root cause of high CPU ready time effectively. For example, increasing the number of physical NICs or adding additional storage might improve network or storage throughput, respectively, but will not impact CPU scheduling issues. Decreasing the number of virtual machines hosted might alleviate some demand on CPU resources, but it does not provide a targeted solution for improving the specific VMs that are experiencing high CPU ready time. Therefore, adjusting CPU reservations is the most direct and effective way to