VCP-VMC 2024 Question 181
Select 3A VMware administrator is tasked with troubleshooting storage performance issues in a vSphere environment. The virtual machines (VMs) are experiencing high latency, and the administrator suspects the issue might be related to storage I/O. Which steps should the administrator take to determine the root cause of the storage performance issue?
- A
Use vSphere Client to monitor datastore performance metrics such as IOPS, latency, and throughput.
- B
Enable Storage I/O Control (SIOC) on the datastore to prioritize I/O for critical virtual machines.
- C
Analyze VM-specific performance metrics, including virtual disk latency, from the vSphere Client or vRealize Operations Manager.
- D
Check the pathing policy and the number of active paths to the datastore in the storage configuration.
- E
Increase the size of the datastore to provide more storage capacity for the VMs.
Show answer and explanation
Correct answers: A, C, D
Explanation
To determine storage performance issues, administrators should examine datastore-level metrics (IOPS, latency, and throughput) and VM-level metrics (virtual disk latency) to isolate where the bottleneck exists. Additionally, checking the pathing policies and the number of active paths can uncover potential misconfigurations affecting storage performance. Enabling SIOC and increasing datastore size may help address certain issues but are not diagnostic steps for performance troubleshooting.
- A. Correct.
Monitoring datastore performance metrics such as IOPS, latency, and throughput is critical in identifying potential bottlenecks at the datastore level.
- B. Incorrect.
Enabling Storage I/O Control (SIOC) is a performance tuning step but does not directly help in diagnosing storage performance issues. It is more of a mitigation strategy.
- C. Correct.
Analyzing VM-specific performance metrics, such as virtual disk latency, provides insight into how individual VMs are affected, which is key to determining the root cause of storage issues.
- D. Correct.
Checking the pathing policy and number of active paths to the datastore ensures that the storage traffic is balanced and there are no misconfigurations affecting performance.
- E. Incorrect.
Increasing the size of the datastore only addresses capacity issues and does not directly impact performance troubleshooting.