VSpere licenses do not go per node but per processor
Verify that you have a valid license for vSAN.
Using vSAN in production environments requires a special license that you assign to the vSAN clusters.
You can assign a standard vSAN license to the cluster, or a license that covers advanced functions.
Advanced features include RAID 5/6 erasure coding, and deduplication and compression. An enterprise
license is required for encryption and stretched clusters. For information about assigning licenses, see
Configure License Settings for a vSAN Cluster.
The capacity of the license must cover the total number of CPUs in the cluster.
vCenter with a license you can hook multiple ESXi in the same network environment.
Thank for the feedback.
You are right. By mistake I wrote node, but I have four single-processor nodes, each 24 cores.
"which versions of Vphere and vCenter should I buy?"
vSAN doesn't require any specific license level of vSphere so pick whichever one has the features you require (e.g. NIOC, SIOC, SDRS, Auto Deploy, VM Encryption):
As an aside, vSAN comes with free vDS support regardless of the vSphere licensing edition in use.