How to get a list of RBD volumes separated by nodes?
kubectl -n d8-ceph-csi get po -l app=csi-node-rbd --no-headers -owide \
| awk '{print "echo "$7"; kubectl -n d8-ceph-csi exec "$1" -c node -- rbd showmapped"}' | bash
kubectl -n d8-ceph-csi get po -l app=csi-node-rbd --no-headers -owide \
| awk '{print "echo "$7"; kubectl -n d8-ceph-csi exec "$1" -c node -- rbd showmapped"}' | bash