2V0-21.23 Question 327
Select 3An administrator has been notified that a virtual machine (VM) running on an ESXi host is experiencing performance degradation. Upon investigation, the VM is found to have multiple snapshots created over the past few weeks. Which of the following are potential performance impacts of maintaining multiple snapshots for an extended period?
- A
Increased datastore latency due to the accumulation of delta files.
- B
Faster VM backups due to reduced storage requirements.
- C
Decreased VM read and write performance as the snapshot chain grows longer.
- D
Higher risk of datastore capacity exhaustion due to the growing size of snapshot files.
- E
Improved VM performance due to snapshot consolidation.
Show answer and explanation
Correct answers: A, C, D
Explanation
Snapshots are useful for creating point-in-time backups but can negatively impact VM performance if retained for extended periods. As snapshots accumulate, delta files grow and can lead to increased datastore latency and reduced read/write performance. Additionally, multiple snapshots can consume significant space, increasing the risk of datastore capacity exhaustion. Best practices recommend deleting snapshots as soon as they are no longer needed to minimize these performance and storage issues.
- A. Correct.
Maintaining multiple snapshots creates delta files for each snapshot, which can increase datastore latency as ESXi must handle more I/O operations across these files.
- B. Incorrect.
This is incorrect. Snapshots do not reduce storage requirements; instead, they consume additional storage space over time.
- C. Correct.
As the snapshot chain grows longer, the VM's performance decreases because ESXi must traverse multiple delta files to read or write data, leading to slower I/O operations.
- D. Correct.
Snapshots consume additional space over time as they grow. If multiple snapshots are retained, the risk of exhausting datastore capacity increases significantly.
- E. Incorrect.
This is incorrect. Snapshot consolidation improves performance only after snapshots are deleted and committed back to the base disk. Maintaining snapshots does not improve performance.