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Exam 5V0-21.20 topic 1 question 4 discussion

Actual exam question from VMware's 5V0-21.20
Question #: 4
Topic #: 1
[All 5V0-21.20 Questions]

An All-Flash vSAN cluster has 4 nodes with this disk group composition on each host:
✑ 1 × 800 GB SAS SSD
✑ 6 × 3.84 TB SATA SSD
An administrator observes that in an All-Flash cluster, the Write Buffer Free Percentage is consistently low. As a result, there is increased latency experienced by the workloads.
Which remediation steps will resolve this issue?

  • A. Add a second disk group with a new cache device and distribute the capacity disks equally.
  • B. Add a second cache device to the same disk group to increase the caching size.
  • C. Modify advanced vSAN configuration parameters to utilize the complete 800 GB for caching.
  • D. Replace the existing cache device with a larger cache device.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️

Comments

Chosen Answer:
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jsi928
8 months, 1 week ago
Answer A. There is a 600GB Cap on Cache disks in vSAN 7.
upvoted 1 times
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Lazylinux
2 years, 2 months ago
Selected Answer: A
is correct based on VMware recommended approach as D requires far more work, It is relatively easy to scale up both cache and capacity together with the introduction of new disk groups. It is also easy to add additional capacity by inserting new agnetic disks to a disk group in hybrid (orflash devices for all-flash). But it could be much more difficult to add additional cache capacity. This is especially true if there is a need to swap out the current cache device and replace it with a newer larger one. Of course, this approach is also much more expensive. It is far easier to overcommit on flash resources to begin with rather than trying to increase it once vSAN is in production. Design decision: Design with additional flash cache to allow easier scale up of the capacity layer. Alternatively scaling up cache and capacity at the same time through the addition of new disks groups is also an easier approach than trying to simply update the existing flash cache device in an existing disk group. https://core.vmware.com/resource/vmware-vsan-design-guide#sec6843-sub8
upvoted 3 times
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Lazylinux
2 years, 3 months ago
Selected Answer: D
Cache Must be 10% of capacity
upvoted 1 times
Lazylinux
2 years, 2 months ago
Ignore not quite correct - see my other comment
upvoted 1 times
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bertrand14
2 years, 10 months ago
D is correct
upvoted 2 times
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Rabbit117
3 years ago
I think A.
upvoted 4 times
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DenZn
3 years, 1 month ago
A should be correct
upvoted 2 times
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A (35%)
C (25%)
B (20%)
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