2V0-21.23 Question 326
Select 3A system administrator notices a performance issue on a virtual machine that has multiple snapshots retained over several months. Which of the following are potential reasons for the performance degradation?
- A
Snapshots increase the amount of disk space used, leading to potential storage bottlenecks.
- B
Snapshots cause the virtual machine to consume additional CPU resources during normal operation.
- C
Snapshots create a hierarchical chain of delta files, which can increase I/O latency.
- D
Snapshots require the host to allocate additional physical memory for the virtual machine.
- E
Snapshots can lead to increased storage latency due to the need to consolidate changes into the base disk over time.
Show answer and explanation
Correct answers: A, C, E
Explanation
Maintaining snapshots for an extended period can degrade performance due to increased disk space usage and the hierarchical chain of delta files, which impacts I/O performance. Additionally, storage latency may rise during snapshot consolidation or deletion tasks. However, snapshots do not directly affect CPU or memory allocation for the virtual machine during normal operation.
- A. Correct.
Snapshots increase the amount of disk space used over time, and if storage resources are constrained, this can lead to performance issues like storage bottlenecks.
- B. Incorrect.
Snapshots do not directly cause the virtual machine to consume additional CPU resources during normal operation. However, I/O and storage-related tasks might indirectly impact CPU usage depending on the workload.
- C. Correct.
Snapshots create a delta file chain (parent and child relationships) for each snapshot. This hierarchy can increase I/O latency when the system reads or writes data to the virtual disk.
- D. Incorrect.
Snapshots do not require additional physical memory allocation for the virtual machine, as memory usage is independent of snapshot existence.
- E. Correct.
Snapshots can increase storage latency because consolidating changes from delta files into the base disk over time can impact storage performance, especially during operations like snapshot deletion.