OpenEBS allocates PV higher nfs-server PV capacity

[Humungus14]

SC for nfs-server

allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: openebs-three-replica
parameters:
  fsType: xfs
  protocol: nvmf
  repl: "3"
provisioner: io.openebs.csi-mayastor
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer

Size of PV is 10Gi.

NAME               STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS            AGE
nfs-server-claim   Bound    pvc-4a719762-c751-4eb8-a487-a0430c75f1ce   10Gi       RWO            openebs-three-replica   6m3s

Create PVC for pods with RWX with higher size, than nfs-server PV size

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nfs-claim-1
  namespace: test
spec:
  storageClassName: nfs-csi
  accessModes: [ "ReadWriteMany" ]
  resources:
    requests:
      storage: 20Gi

Create deployment and mount PV

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: test
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80
        volumeMounts:
          - mountPath: "/volume"
            name: data
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: nfs-claim-1

Pods are started, size inside 10Gi

Filesystem                                                                         Size  Used Avail Use% Mounted on
nfs-server.nfs-server.svc.cluster.local:/pvc-fa3737c7-48e4-4b09-be41-e73808efb826   10G  103M  9.9G   2% /volume