$ oc get pvc
NAME                                                      STATUS   VOLUME                                     CAPACITY      ACCESS MODES   STORAGECLASS                                 VOLUMEATTRIBUTESCLASS   AGE
ocp-test-tpm-ecae235c-84b8-4453-a9fe-3dd9a31b2af9-hl8d5   Bound    pvc-734a224a-0c6d-4e65-95a9-39209f82dab8   11Mi          RWX            ocs-storagecluster-ceph-rbd-virtualization   <unset>                 17m
ocp-test-tpm-ecae235c-84b8-4453-a9fe-3dd9a31b2af9-tfgnm   Bound    pvc-ce679f3e-3df7-4094-bb22-01a242e67e77   19238318189   RWX            nfs-csi                                      <unset>                 17m
$ oc patch storageclass nfs-csi -p '{"metadata": {"annotations": {"storageclass.kubernetes.io/is-default-class": "true"}}}'
storageclass.storage.k8s.io/nfs-csi patched

$ oc get storageclass|grep nfs-csi
nfs-csi (default)                            nfs.csi.k8s.io                          Delete          Immediate              false                  4d20h

$ oc get pvc
NAME                                                      STATUS   VOLUME                                     CAPACITY      ACCESS MODES   STORAGECLASS                                 VOLUMEATTRIBUTESCLASS   AGE
ocp-test-tpm-ecae235c-84b8-4453-a9fe-3dd9a31b2af9-hl8d5   Bound    pvc-734a224a-0c6d-4e65-95a9-39209f82dab8   11Mi          RWX            ocs-storagecluster-ceph-rbd-virtualization   <unset>                 25m
ocp-test-tpm-ecae235c-84b8-4453-a9fe-3dd9a31b2af9-tfgnm   Bound    pvc-ce679f3e-3df7-4094-bb22-01a242e67e77   19238318189   RWX            nfs-csi                                      <unset>                 25m
persistent-state-for-mtv-func-rhel9-uefi-lkwzm            Bound    pvc-f7bfc106-cc5b-4dbd-a608-135b5fd39ab9   11096043      RWX            nfs-csi                                      <unset>                 30s