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Exam AZ-801 topic 2 question 4 discussion

Actual exam question from Microsoft's AZ-801

Question #: 4
Topic #: 2

You have a failover cluster named Cluster1 that has the following configurations:
✑ Number of nodes: 6
✑ Quorum: Dynamic quorum
✑ Witness: File share, Dynamic witness
What is the maximum number of nodes that can fail simultaneously while maintaining quorum?

A. 1
B. 2
C. 3
D. 4
E. 5

Show Suggested Answer

Suggested Answer: C 🗳️

by xxxxx85xx at April 23, 2022, 2:47 p.m.

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wouter0121

Highly Voted 1 year, 9 months ago

E is not correct it says simultaneously so at the same time. Its correct a vote gets removed when a host crashes but if it all happends at the same time the cluster will be gone. Answer is 3

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vcp555

Most Recent 4 months, 2 weeks ago

Selected Answer: E

Answer E: 5 can fail as has dynamic quorum

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sardonique

5 months, 1 week ago

Selected Answer: C

6 nodes + 1 witness = 7; majority = (7 / 2) + 1 = 3.5 + 1 = any combination of at least 4 nodes or any 3 nodes and 1 witness have to be alive to keep the thing going. therefore the max allowed concurrent failures is 3 nodes

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BlackCat9588

5 months, 3 weeks ago

Selected Answer: C

C: - 3

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starseed

10 months, 2 weeks ago

answer is 3

upvoted 1 times

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smorar

1 year, 1 month ago

Selected Answer: C

3 is correct.

upvoted 3 times

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bpaccount

1 year, 1 month ago

Selected Answer: C

3 is correct.

upvoted 2 times

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Kuikz

1 year, 2 months ago

Selected Answer: C

i agree with Deidros

upvoted 1 times

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Sc00by77

1 year, 8 months ago

Selected Answer: C

Dynamic Quorum specifically states that it does not work in simultaneous shutdowns which is called out in the question. The answer is 3.

upvoted 3 times

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tomasek88

1 year, 11 months ago

Selected Answer: E

E --> is correct answer --> because dynamic quorum

upvoted 2 times

klwood2000

1 year, 9 months ago

Dynamic Quorum specifically states that it does not work in simultaneous shutdowns which is called out in the question. The answer is 3.

upvoted 2 times

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[Removed]

2 years ago

https://www.mssqltips.com/sqlservertip/4434/dynamic-quorum-for-windows-server-2012-r2-cluster-to-support-sql-server-alwayson/

upvoted 1 times

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[Removed]

2 years ago

Check this out, very good... Answer is E

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ala76nl

2 years ago

Answer is E https://www.starwindsoftware.com/blog/understand-failover-cluster-quorum

upvoted 1 times

Deidros

1 year, 10 months ago

Excellent link but I think you missed a key part of the explanation : "So for the stretched cluster scenario, if you lose a room, the failure is simultaneous and the dynamic quorum has not the time to recalculate the majority of votes." The question does state that the failures are simultaneous. So the Dynamic Quorum doesn't compute the new quorum required and we can't go down to the "Last-man standing" situation. If all the fails are sequential, it seems to be indeed possible to get down to one node with the configuration showed in the question. But again, with simultaneous fails, we need to have no more than 3 nodes that fail so that we keep the quorum of 4 thanks to our initial 6 nodes + 1 active dynamic witness due to the starting even number of nodes. That will leaves us with 3+1 votes and the cluster runs. If 4 nodes crashes SIMULTANEOUSLY, we are left with 2+1 votes and the cluster shuts down. Again, that is my understanding because Microsoft documentation isn't clear in the 4 nodes example about that fact that the failures are sequentials.

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phi3nix

2 years, 1 month ago

I asked MS as I have access to support answer is C. "In our case, if all 6 nodes are healthy, we have 7 votes in cluster, the cluster can accept losing 3 votes(nodes) at most simultaneously to remain the cluster online, as 4 votes(3 nodes+dynamic witness) still constitute the majority of cluster If we have a node down, then 5 nodes healthy in cluster, the witness doesn't have vote, 5 votes now, it's acceptable that 2 nodes failed simultaneously."

upvoted 4 times

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arnitjoe

2 years, 1 month ago

https://learn.microsoft.com/en-us/azure-stack/hci/concepts/quorum "Dynamic quorum enables the ability to assign a vote to a node dynamically to avoid losing the majority of votes and to allow the cluster to run with one node (known as last-man standing). Let's take a four-node cluster as an example. Assume that quorum requires 3 votes. In this case, the cluster would have gone down if you lost two nodes. However, dynamic quorum prevents this from happening. The total number of votes required for quorum is now determined based on the number of nodes available. So, with dynamic quorum, the cluster will stay up even if you lose three nodes......" So, the answer is E since in this question it's a six-node cluster so five nodes can fail.

upvoted 2 times

phi3nix

2 years, 1 month ago

No, my friend. The answer is C. We always need the majority of the votes.

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syu31svc

2 years, 3 months ago

Selected Answer: C

https://learn.microsoft.com/en-us/azure-stack/hci/concepts/quorum If you have an even number of nodes plus witness, the witness votes, so the total is odd Up to 3 can fail leaving 3 nodes and 1 witness for the vote Answer is C

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wyvern8888

2 years, 3 months ago

With dynamic quorum and a file share witness, the maximum number of nodes that can fail simultaneously while maintaining quorum in a failover cluster is calculated as follows: Maximum number of nodes that can fail = ((Total number of nodes + 1) / 2) - (Number of witness votes) In this case, there are 6 nodes and a dynamic file share witness. Since the witness is also dynamic, it will be given a vote only when needed. The default witness vote is 1. Therefore, the maximum number of nodes that can fail while maintaining quorum is: ((6+1)/2) - 1 = 2 This means that up to two nodes can fail simultaneously while maintaining quorum in Cluster1. Therefore, the answer is option B - 2.

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