custom-kube-scheduler/kubernetes-v1.15.4/cluster/addons/storage-class/vsphere/default.yaml

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: thin
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
  labels:
    kubernetes.io/cluster-service: "true"
provisioner: kubernetes.io/vsphere-volume
parameters:
    diskformat: thin