For 3-5 hosts, the 2.1 RAID-5 data placement will be used.
B : RAID-5 does not provide FTT=2 protection. For that, it will be RAID-6 (an it needs more hosts)
C : It needs at least 6 hosts for 4+1 data placement.
D : well, noooo
Starting with vSAN 8.0 ESA (Express Storage Architecture) VMware has introduced an adaptive RAID-5 mechanism. What does this mean? Essentially, vSAN deploys a particular RAID-5 configuration depending on the size of the cluster! There are two options, let’s list them out and discuss them individually.
RAID-5, 2+1, 3-5 hosts
RAID-5, 4+1, 6 hosts or more
As mentioned in the above list, depending on the cluster size, you will see a particular RAID-5 configuration. Clusters of up to 5 hosts will see a 2+1 configuration when RAID-5 is selected.
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