VCP-VMC 2024 Question 174
Single answerAn organization is experiencing performance bottlenecks in their VMware Cloud environment. Their workloads frequently experience high CPU ready times, and the vSphere Cluster is configured with DRS in manual mode. What is the most effective optimization step to address the issue?
- A
Enable DRS in fully automated mode and set the automation level to 'Aggressive'.
- B
Increase the vCPU count for the virtual machines experiencing high CPU ready times.
- C
Reduce the number of virtual machines running on the hosts by increasing the cluster size.
- D
Modify the virtual machine CPU reservations to ensure critical workloads have guaranteed resources.
Show answer and explanation
Correct answer: A
Explanation
CPU ready time indicates that virtual CPUs are waiting to be scheduled on physical CPUs, often caused by resource contention. Enabling DRS in fully automated mode allows vSphere to dynamically balance workloads across hosts, mitigating resource contention. Setting DRS to 'Aggressive' ensures that the system rebalances workloads more frequently, making it the most effective optimization step in this scenario.
- A. Correct.
Enabling DRS in fully automated mode allows vSphere to automatically balance workloads across the cluster, reducing CPU contention and minimizing CPU ready times. Setting the automation level to 'Aggressive' ensures frequent rebalancing.
- B. Incorrect.
Increasing the vCPU count for virtual machines may worsen the CPU contention problem and increase CPU ready times further, as it does not address the root cause of overcommitment.
- C. Incorrect.
Reducing the number of virtual machines or increasing the cluster size could help, but it is not the most effective or immediate solution. This approach requires additional resources and planning.
- D. Incorrect.
Adjusting CPU reservations can help critical workloads, but it does not fully resolve the bottleneck for all workloads in the cluster.