Symptoms:
VMware vCenter Server 7.x
VMware vCenter Server 6.x
This issue occurs because vCenter Server can not detect any vSAN storage provider.
There is no way to detect vSAN storage provider if no hosts are available when vCenter Server starts.
Note: vSAN storage provider cannot be recognized automatically even after host start working properly.
To work around this issue, you have the following options.
The VASA-related issue has been resolved in 6.7 U3 and 7.0 GA onwards.