In default values.yaml the name of the storage class property missmatch the one used in statefullset: here `.storageClass` is used: https://github.com/Part-DB/helm-charts/blob/209f6302591de86d06a8292f046e0c0dcdb4bead/charts/part-db/templates/statefulset.yaml#L110 And here `.storageClassName` is used: https://github.com/Part-DB/helm-charts/blob/209f6302591de86d06a8292f046e0c0dcdb4bead/charts/part-db/values.yaml#L75