If you are not familiar with the oc command, refer to OpenShift - Getting Started with the oc command.

A persistent volume (PV) is the "physical" volume (such as a hard disk drive or solid state drive) on the host machine (node) that stores your persistent data, whereas a persistent volume claim (PVC) is a reference to a persistent volume, used by a pod.

The oc get storageclass command can be used to list the storage classes that have been created.

~]$ oc get storageclass
NAME                     PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
file-storage (default)   csi.trident.netapp.io          Delete          Immediate           true                   377d
thin                     kubernetes.io/vsphere-volume   Delete          Immediate           false                  381d