VSAN.ClomMaxComponentSizeGB explained [cormachogan.com]
VSAN.ClomMaxComponentSizeGB explained
By default VSAN.ClomMaxComponentSizeGB is set to 255GB. When Virtual SAN stores virtual machine objects, it creates components whose default size does not exceed 255 GB. If you use physical disks that are smaller than 255GB, then you might see errors similar to the following when you try to deploy a virtual machine: