VMware Exam 5V0-21.21 Topic 2 Question 81 Discussion

Actual exam question for VMware's 5V0-21.21 exam

Question #: 81
Topic #: 2

An administrator wants to check the performance metrics for the workloads and their virtual disks that are running on a vSAN cluster, but no statistical charts are displayed in the vSphere client.

Why is this behavior being seen?

AvSAN network diagnostic mode is not enabled.

BvSAN proactive tests haven't been run yet.

CvSAN performance service is turned off.

DvSAN performance verbose mode is not enabled.

Show Suggested Answer

Suggested Answer: C

: Some tools allow for measuring latency peaks. This unfortunately isn't ideal, as it can unfairly represent statistical outliers, which may very well occur when there is little to no I/O activity. The best way to understand the actual behavior of VM and application latencies is to observe in time based performance graphs. Depending on the level of detail, you may need to measure at the individual VMDK level. Become familiar with these graphs to determine what is normal, and what is not for that given application. This is where you can use built-in functionality of vCenter and the vSAN performance service metrics to gather this information.

https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-monitoring.doc/GUID-EF27701E-7BAC-4E76-9D2F-E1C58CAAB06D.html

by Roslyn at Apr 04, 2025, 10:59 AM

Limited Time Offer

25%

Off

Get Premium 5V0-21.21 Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Mariann

21 hours ago

This seems like a straightforward question about vSAN performance metrics. I'll need to carefully review the options and think through the potential causes.

upvoted 0 times

...

Angella

4 months ago

Well, if the vSAN performance service is turned off, how else are they going to measure how fast their virtual disks are spinning? Time to bust out the good old-fashioned stopwatch!

upvoted 0 times

...

Junita

4 months ago

A) vSAN network diagnostic mode is not enabled? Guess the admin's network is still playing hide and seek with the performance data.

upvoted 0 times

Annice

3 months ago

C) Could be that vSAN proactive tests haven't been run yet.

upvoted 0 times

...

Jeannine

4 months ago

B) Maybe the vSAN performance service is turned off.

upvoted 0 times

...

Brice

4 months ago

A) vSAN network diagnostic mode is not enabled.

upvoted 0 times

...

6 months ago

I think the correct answer is C) vSAN performance service is turned off. Without the performance service, there won't be any statistical charts displayed.

upvoted 0 times

Edelmira

5 months ago

Yes, that's correct. Without the performance service, the metrics won't be available.

upvoted 0 times

...

Stephanie

5 months ago

I agree, the performance service needs to be turned on for the statistical charts to be displayed.

upvoted 0 times

...