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.

Before issuing the oc get pv (Persistent Volumes) command, issue the oc login command. The oc get pv command will return the list of persistent volume.

~]$ oc get pv
NAME    CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS    CLAIM                   STORAGECLASS               REASON    AGE
pv001   1Gi        RWO            Delete           Bound     project001/pod001       glusterfs-storage                    1d
pv002   10Gi       RWO            Delete           Bound     project001/pod002       glusterfs-storage                    1d
pv003   200Gi      RWO            Delete           Bound     project002/pod001       glusterfs-registry-block             123d

Or a single persistent volume claim can be returned.

~]$ oc get pv pv001
NAME    CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS    CLAIM                   STORAGECLASS               REASON    AGE
pv001   1Gi        RWO            Delete           Bound     project001/pod001       glusterfs-storage                    1d

The oc describe pv command can be used to display the details of a Persistent Volume. In this example, the details of the pvc001 Persistent Volume Claim will be displayed.

~]$ oc describe pv pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268
Name:            pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268
Labels:          <none>
Annotations:     pv.kubernetes.io/provisioned-by: csi.trident.netapp.io
Finalizers:      [kubernetes.io/pv-protection external-attacher/csi-trident-netapp-io]
StorageClass:    file-storage
Status:          Bound
Claim:           my-namespace/my-app-v2
Reclaim Policy:  Delete
Access Modes:    RWO
VolumeMode:      Filesystem
Capacity:        1Gi
Node Affinity:   <none>
Message:         
Source:
    Type:              CSI (a Container Storage Interface (CSI) volume source)
    Driver:            csi.trident.netapp.io
    FSType:            
    VolumeHandle:      pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268
    ReadOnly:          false
    VolumeAttributes:      backendUUID=c5d7c284-774d-4c7c-94f4-18d1db9675e2
                           internalName=k8s_pvc_4a4e9b8d_e614_49c1_b1cf_c0a0d8c4a268
                           name=pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268
                           protocol=file
                           storage.kubernetes.io/csiProvisionerIdentity=1626729443511-8081-csi.trident.netapp.io
Events:                <none>

Or, the oc get pvc command with the --output json​ or --output yaml option can be used.

~]$ oc get pv pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268 --output json
{
    "apiVersion": "v1",
    "kind": "PersistentVolume",
    "metadata": {
        "annotations": {
            "pv.kubernetes.io/provisioned-by": "csi.trident.netapp.io"
        },
        "creationTimestamp": "2021-08-05T18:04:44Z",
        "finalizers": [
            "kubernetes.io/pv-protection",
            "external-attacher/csi-trident-netapp-io"
        ],
        "name": "pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268",
        "resourceVersion": "22335822",
        "uid": "afb728a2-c587-43c3-a47d-7db1dbacba22"
    },
    "spec": {
        "accessModes": [
            "ReadWriteOnce"
        ],
        "capacity": {
            "storage": "1Gi"
        },
        "claimRef": {
            "apiVersion": "v1",
            "kind": "PersistentVolumeClaim",
            "name": "redis-storage",
            "namespace": "my-namespace",
            "resourceVersion": "22335741",
            "uid": "4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268"
        },
        "csi": {
            "driver": "csi.trident.netapp.io",
            "volumeAttributes": {
                "backendUUID": "c5d7c284-774d-4c7c-94f4-18d1db9675e2",
                "internalName": "k8s_pvc_4a4e9b8d_e614_49c1_b1cf_c0a0d8c4a268",
                "name": "pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268",
                "protocol": "file",
                "storage.kubernetes.io/csiProvisionerIdentity": "1626729443511-8081-csi.trident.netapp.io"
            },
            "volumeHandle": "pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268"
        },
        "persistentVolumeReclaimPolicy": "Delete",
        "storageClassName": "file-storage",
        "volumeMode": "Filesystem"
    },
    "status": {
        "phase": "Bound"
    }
}

The --output jsonpath option can be used to print the value of a specific JSON key.

~]$ oc get pv pvc-4a4e9b8d-e614-49c1-b1cf-c0a0d8c4a268 --output jsonpath={.spec.capacity.storage}
1Gi