VMware 5V0-21.21 Exam - 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, 09:59 AM

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Refugia

2 months ago

Definitely A, network diagnostic mode is often overlooked.

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Dorothy

2 months ago

Wait, is it really that simple? I thought it was more complicated!

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Nohemi

3 months ago

I think it could also be B, proactive tests are important too.

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Dacia

3 months ago

Nah, I doubt it's D, verbose mode isn't usually the issue.

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Delbert

3 months ago

Pretty sure it's option C, performance service needs to be on.

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Mitsue

3 months ago

I thought network diagnostic mode was important, but I can't recall if it affects the performance metrics display. Could it be A?

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Aimee

4 months ago

I'm not entirely sure, but I feel like enabling verbose mode could help with performance details. Is that option D?

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Gennie

4 months ago

I think I saw a question like this in our practice exam. It might be related to proactive tests not being run, so maybe option B?

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Erasmo

4 months ago

I remember something about the performance service needing to be enabled for metrics to show up. Could it be option C?

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Jaclyn

4 months ago

I've got a good feeling about this one. Based on my experience with vSAN, I think the issue is likely related to the performance service or diagnostic mode. I'll carefully evaluate each option to determine the correct answer.

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Vivienne

4 months ago

Okay, let's see. The key here is to identify the specific setting or service that controls the performance metrics display. I'll need to think through the vSAN configuration options to determine the most likely cause.

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Nieves

5 months ago

Hmm, I'm a bit unsure about this one. The question is asking about why the performance charts aren't showing up, so I'll need to consider the different settings and configurations that could be causing that.

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Mariann

5 months 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.

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Angella

9 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!

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Junita

9 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.

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Annice

8 months ago

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

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Jeannine

8 months ago

B) Maybe the vSAN performance service is turned off.

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Brice

8 months ago

A) vSAN network diagnostic mode is not enabled.

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Tina

9 months ago

D) vSAN performance verbose mode is not enabled? Sounds like someone needs to turn up the volume on their vSAN performance!

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Ben

9 months ago

D) vSAN performance verbose mode is not enabled.

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Cherrie

9 months ago

C) vSAN performance service is turned off.

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Marvel

9 months ago

A) vSAN network diagnostic mode is not enabled.

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Pearlie

10 months ago

Maybe someone forgot to enable vSAN network diagnostic mode as well.

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Malcom

10 months ago

I agree with Irma, that could be why the charts are not showing.

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Aimee

10 months ago

Hmm, maybe B) vSAN proactive tests haven't been run yet. Gotta make sure those tests are good to go before the metrics show up.

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Lucina

8 months ago

I agree, let's check if B) vSAN proactive tests haven't been run yet.

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Anjelica

8 months ago

Actually, it might be D) vSAN performance verbose mode is not enabled.

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Sherell

8 months ago

No, I believe it's A) vSAN network diagnostic mode is not enabled.

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Gail

8 months ago

I think C) vSAN performance service is turned off.

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Dominga

8 months ago

It could be D) vSAN performance verbose mode is not enabled.

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Matthew

8 months ago

I agree with B) vSAN proactive tests haven't been run yet.

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Shenika

9 months ago

Maybe A) vSAN network diagnostic mode is not enabled.

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Aileen

9 months ago

I think C) vSAN performance service is turned off.

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Irma

10 months ago

I think the vSAN performance service is turned off.

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Justine

10 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.

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Edelmira

9 months ago

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

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Stephanie

10 months ago

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

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