Hello. We have the same issue with the cluster with ESXi 7 u2a.
We have stretched cluster (vSAN 4+4) +witness. I am unable to create RAID5 Policy-the vsan datastore shown as incompatibli.Very strange. With U2 there s need to specify storage tier as All Flash but the vsan datastore is listed as incompatbile. vSAN Skyline health is OK no warnings no errors.
So is there some workaround or solution to create RAID5 stretched policy? Please Help Please.
Thank you in advance.