Exam 5V0-21.19 topic 1 question 81 discussion

I agree with answer A: When you provision a virtual machine on the cluster with fault domains, Virtual SAN distributes protection components, such as witnesses and replicas of the virtual machine objects across different fault domains. As a result, the Virtual SAN environment becomes capable of tolerating entire rack failures in addition to a single host, storage disk, or network failure. https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-C365ACE8-7485-4463-A12C-71D1917A4930.html

With explicit fault domains and raid-1 mirroring policy, we can tolerate one rack failure. Also with every host is single fault domain and ftt=2 raid-6 policy we can still tolerate one rack failure. Question also marked that maximizing resources, so i choose D.

5v0-22.21 A vSAN administrator has three available racks and six vSAN hosts and needs to protect against a rack failure while maximizing resources. Which two strategies should the vSAN administrator use to achieve this goal? (Choose two.) A. RAID-5/FTT=1 B. vSAN stretched cluster C. Specify fault domain D. RAID-6/FTT=2 E. 2-node configuration the answer is ?

For sure

key phrase in the question is "protection against Rack Failure". A- has to be the correct answer. RAID-6 requires 6 racks, which we do not have.

Usually I fully agree with diegof1 answers. But here I would give my point to Aolivera and answer D. We have 6 hosts and 3 raks so 2 hosts per rack. In RAID6 we are protected for 2 host failure. So in worst case scenario those 2 hosts will be in same rack. This answere under circumstances mentinoed in qestion is covering all assumptions. -maximising resources -resiliance to whole rack failure

A is the correct answer. vSAN supports the creation of explicit fault domains. Explicit fault domains: • Increase availability • Protect against rack and other types of failures • Ensure redundancy components of the same object do not live in the same rack Taken from vSAN 6.7 Deploy and Manage Lecture Manual - Explicit Fault Domains section

The correct answer is A. Because of Rack.

I would say D. Question states maximising resources. A 100 GB will take 200GB on FTT=1 raid 1 while it will take 150 in Raid 6 and having 3 racks with 2 ESXi servers would be no problem for that configuration as max errors on the worse case will be 2 in the same rack.