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Exam 5V0-21.19 All Questions

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Exam 5V0-21.19 topic 1 question 91 discussion

Actual exam question from VMware's 5V0-21.19
Question #: 91
Topic #: 1
[All 5V0-21.19 Questions]

When would disabling Read Locality be beneficial for a 2-node vSAN?

  • A. when using all-flash disk groups
  • B. when using hybrid disk groups
  • C. when using erasure coding
  • D. when using witness traffic separation
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Suggested Answer: D 🗳️
Reference:
https://www.virtualizationhowto.com/2019/09/two-node-vsan-performance-tip-disable-site-read-locality/

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manooflon
Highly Voted 4 years, 11 months ago
I would go for B:in hybrid 2 node cluster as this will allow reads to be done on both node https://storagehub.vmware.com/t/vsan-2-node-guide/read-locality-in-vsan-2-node-clusters/
upvoted 7 times
MIP
4 years, 9 months ago
In a vSAN 2 Node Clusters, 100% of reads, occur in the site the VM resides on. This aligns with the behavior of vSAN Stretched Clusters. Read locality overrides the NumberOfFailuresToTolerate=1 policy’s behavior to distribute reads across the components. This is not significant to consider in All-Flash configurations, but should be considered in Hybrid vSAN configurations. ... Not only does this help in the event of a virtual machine moving across hosts, which would require cache to be rewarmed, but it also allows reads to occur across both mirrors, distributing the load more evenly across both hosts.
upvoted 3 times
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faissalman
Most Recent 2 years, 2 months ago
Selected Answer: B
I feel a bit lost to be honest, but I think it's B and not D. https://storagehub.vmware.com/t/vsan-2-node-guide/read-locality-in-vsan-2-node-clusters/ Thanks @manooflon.
upvoted 1 times
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jasonv
4 years, 9 months ago
i'll go for the B also, in hybrid we use cache also for reading, in all flash only for writting so hybrid will get more advantage on that configuration
upvoted 2 times
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