Helm删除StorageClass但保留Persistent卷声明

我使用helm来部署StatefulSet，下面是yaml

---
kind: StorageClass
apiVersion: storage.k8s.io/v1beta1
metadata:
  name: {{ .Values.database.mongo.storageClassName }}
  labels:
    for: for-mongo-statefulset
provisioner: kubernetes.io/gce-pd
parameters:
  type: pd-ssd
reclaimPolicy: Retain
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: mongo
spec:
  serviceName: {{ .Values.database.mongo.serviceName }}
  replicas: {{ .Values.database.mongo.replicas }}
  template:
    metadata:
      labels:
        role: mongo
        environment: prod
    spec:
      serviceAccountName: {{ .Values.serviceAccount }}
      terminationGracePeriodSeconds: 10
      containers:
        - name: mongo
          image: mongo
          command:
            - mongod
            - "--bind_ip"
            - 0.0.0.0
            - "--replSet"
            - {{ .Values.database.mongo.replicaSet }}
            - "--smallfiles"
            - "--noprealloc"
          ports:
            - containerPort: {{ .Values.database.mongo.port }}
          volumeMounts:
            - name: {{ .Values.database.mongo.storageName }}
              mountPath: /data/db
        - name: mongo-sidecar
          image: cvallance/mongo-k8s-sidecar
          env:
            - name: MONGO_SIDECAR_POD_LABELS
              value: "role=mongo,environment=prod"
            - name: KUBERNETES_MONGO_SERVICE_NAME
              value: {{ .Values.database.mongo.serviceName }}
  volumeClaimTemplates:
  - metadata:
      name: {{ .Values.database.mongo.storageName }}
    spec:
      storageClassName: {{ .Values.database.mongo.storageClassName }}
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 100Gi

在 helm install . -n release-name 上，它创建 StorageClass ， PersistentVolume ＆ PersistentVolumeClaim .

如果我删除了发布 helm delete release-name --purge 它保持pv和pvc这很好 . 但它删除了 StorageClass ，即使我在sc上指定了 reclaimPolicy: Retain .

这是预期的行为吗？

Helm version

Client: v2.10.0+g9ad53aa
Server: v2.10.0+g9ad53aa

Kubernetes version

Client Version: v1.11.1
Server Version: v1.9.7-gke.5

Update

我假设 reclaimPolicy 适用于StorageClass和PV / PVC，感谢@Pablo清除了我对 reclaimPolicy 的理解

回收策略由存储类动态创建的持久卷将具有在类的reclaimPolicy字段中指定的回收策略，该策略可以是Delete或Retain . 如果在创建StorageClass对象时未指定reclaimPolicy，则默认为Delete

有什么类似的 reclaimPolicy 会告诉helm / kubernetes在执行 helm delete release-name --purge 时不删除 StorageClass ？