$ oc get storageclass
NAME                            PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
ibm-spectrum-fusion-mgmt-sc     spectrumscale.csi.ibm.com      Delete          Immediate              true                   2d
ibm-spectrum-fusion (default)   spectrumscale.csi.ibm.com      Delete          Immediate              true                   2d
ibm-spectrum-scale-internal     kubernetes.io/no-provisioner   Delete          WaitForFirstConsumer   false                  2d
ibm-spectrum-scale-sample       spectrumscale.csi.ibm.com      Delete          Immediate              false                  2d


$ oc get pv
control-1.ncw-az1-005.caas.bbtnet.com-pmcollector   25Gi          RWO           Retain           Bound    ibm-spectrum-scale/datadir-ibm-spectrum-scale-pmcollector-0                     ibm-spectrum-scale-internal  

$ oc get pvc  -A
NAMESPACE            NAME                                       STATUS   VOLUME                                              CAPACITY   ACCESS MODES   STORAGECLASS                  AGE
ibm-spectrum-scale   datadir-ibm-spectrum-scale-pmcollector-0   Bound    control-1.ncw-az1-005.caas.bbtnet.com-pmcollector   25Gi       RWO            ibm-spectrum-scale-internal   3d


$ oc get pvc datadir-ibm-spectrum-scale-pmcollector-0 -n ibm-spectrum-scale
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  annotations:
    pv.kubernetes.io/bind-completed: 'yes'
    pv.kubernetes.io/bound-by-controller: 'yes'
  resourceVersion: '5360546'
  name: datadir-ibm-spectrum-scale-pmcollector-0
  uid: 7a7d0609-0608-409f-91e1-209bb0b3c8d1
  creationTimestamp: '2023-05-01T14:13:40Z'
  managedFields:
    - manager: kube-controller-manager
      operation: Update
      apiVersion: v1
      time: '2023-05-01T14:13:40Z'
      fieldsType: FieldsV1
      fieldsV1:
        'f:metadata':
          'f:annotations':
            .: {}
            'f:pv.kubernetes.io/bind-completed': {}
            'f:pv.kubernetes.io/bound-by-controller': {}
          'f:labels':
            .: {}
            'f:app.kubernetes.io/instance': {}
            'f:app.kubernetes.io/name': {}
        'f:spec':
          'f:accessModes': {}
          'f:resources':
            'f:requests':
              .: {}
              'f:storage': {}
          'f:storageClassName': {}
          'f:volumeMode': {}
          'f:volumeName': {}
    - manager: kube-controller-manager
      operation: Update
      apiVersion: v1
      time: '2023-05-01T14:13:40Z'
      fieldsType: FieldsV1
      fieldsV1:
        'f:status':
          'f:accessModes': {}
          'f:capacity':
            .: {}
            'f:storage': {}
          'f:phase': {}
      subresource: status
  namespace: ibm-spectrum-scale
  finalizers:
    - kubernetes.io/pvc-protection
  labels:
    app.kubernetes.io/instance: ibm-spectrum-scale
    app.kubernetes.io/name: pmcollector
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 25Gi
  volumeName: control-1.ncw-az1-005.caas.bbtnet.com-pmcollector
  storageClassName: ibm-spectrum-scale-internal
  volumeMode: Filesystem
status:
  phase: Bound
  accessModes:
    - ReadWriteOnce
  capacity:
    storage: 25Gi

==> However, when executing from pod ibm-spectrum-scale-pmcollector-0, the mountPath `/opt/IBM/zimon/data` where PVC/datadir-ibm-spectrum-scale-pmcollector-0 is mounted still shows that only 12K is used so far and 11G is the currently available space.

[C49904@openshift-eng-bastion-vm ~]$ oc rsh ibm-spectrum-scale-pmcollector-0
Defaulted container "pmcollector" out of: pmcollector, sysmon

sh-4.4$ df -Th | grep -iE 'size|zimon'
Filesystem     Type     Size  Used Avail Use% Mounted on
tmpfs          tmpfs     11G   12K   11G   1% /opt/IBM/zimon/config   

OCP 4.10.21
isf-operator.v2.4.0  

1. by installing IBM Spectrum Scale 
2. 
3.

PVC size displayed from Openshift webconsole shows negative size value.

 
PVC size displayed from Openshift webconsole should not show negative size value.