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Question 74

During a vSAN design workshop, the customer expressed the following requirements:

• The ESXi hosts will have their disk related hardware changed to become vSAN nodes.

• The default storage policy will be based on an FTT=2 (Failures to Tolerate).

• The vSAN Primary level of failures to tolerate (PFTT) will be set to a value of 2.

Based on the request, the architect was shown the following information about the current cluster:

• The number of existing ESXi hosts is 8.

• vSphere High Availability (HA) Admission control set to 37.5%.

How does this information impact the vSAN cluster design?

    Correct Answer: C

    FTT=2 means that the vSAN cluster must be able to tolerate two host failures, which requires a minimum of 5 hosts just for the data layout and an additional one for redundancy during rebuild operations, making 6. With vSphere HA Admission Control set to 37.5%, it means that the cluster reserves resources to tolerate three host failures, leaving only 5 hosts for active operations. This could be problematic for performance and availability during failures. Reducing HA Admission Control to 25% reserves resources for just 2 host failures, aligning better with FTT=2 requirements, ensuring optimal performance and fault tolerance.

Discussion
John_BobOption: C

My answer is C