[root@fedora ~]$ k describe pod rancher-monitoring-grafana-77f8cfb756-jcpjg
Events:
  Type     Reason                  Age                   From                     Message
  ----     ------                  ----                  ----                     -------
  Warning  FailedScheduling        8m11s                 default-scheduler        0/2 nodes are available: 2 pod has unbound immediate PersistentVolumeClaims. preemption: 0/2 nodes are available: 2 Preemption is not helpful for scheduling.
  Warning  FailedScheduling        8m9s                  default-scheduler        0/2 nodes are available: 2 pod has unbound immediate PersistentVolumeClaims. preemption: 0/2 nodes are available: 2 Preemption is not helpful for scheduling.
  Normal   Scheduled               8m7s                  default-scheduler        Successfully assigned cattle-monitoring-system/rancher-monitoring-grafana-77f8cfb756-jcpjg to rke04
  Normal   SuccessfulAttachVolume  7m55s                 attachdetach-controller  AttachVolume.Attach succeeded for volume "pvc-8badb46b-9e65-40a8-9456-dde583a36b57"
  Warning  FailedMount             3m47s (x2 over 6m4s)  kubelet                  Unable to attach or mount volumes: unmounted volumes=[storage], unattached volumes=[kube-api-access-v9dmt sc-datasources-volume sc-dashboard-volume config sc-dashboard-provider grafana-nginx nginx-home storage]: timed out waiting for the condition
  Warning  FailedMount             98s (x11 over 7m54s)  kubelet                  MountVolume.MountDevice failed for volume "pvc-8badb46b-9e65-40a8-9456-dde583a36b57" : rpc error: code = Internal desc = format of disk "/dev/longhorn/pvc-8badb46b-9e65-40a8-9456-dde583a36b57" failed: type:("ext4") target:("/var/lib/kubelet/plugins/kubernetes.io/csi/driver.longhorn.io/5ae6b7bd89bdf6a607c785263cf9fc3363440ecca86a57d710135cabd98f6f6a/globalmount") options:("defaults") errcode:(exit status 1) output:(mke2fs 1.43.8 (1-Jan-2018)
/dev/longhorn/pvc-8badb46b-9e65-40a8-9456-dde583a36b57 is apparently in use by the system; will not make a filesystem here!
)
  Warning  FailedMount  89s  kubelet  Unable to attach or mount volumes: unmounted volumes=[storage], unattached volumes=[storage kube-api-access-v9dmt sc-datasources-volume sc-dashboard-volume config sc-dashboard-provider grafana-nginx nginx-home]: timed out waiting for the condition
[root@fedora ~]$ k describe pod rancher-monitoring-grafana-77f8cfb756-jcpjg^C
[root@fedora ~]$ k get sc
NAME                   PROVISIONER                    RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
longhorn (default)     driver.longhorn.io             Delete          Immediate              true                   15h
tigera-elasticsearch   kubernetes.io/no-provisioner   Retain          WaitForFirstConsumer   false                  16h
[root@fedora ~]$ k get pvc
NAME                                                                                     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
prometheus-rancher-monitoring-prometheus-db-prometheus-rancher-monitoring-prometheus-0   Bound    pvc-b6a950f0-f2b9-4552-a55a-a24d9cf460dd   50Gi       RWO            longhorn       8m4s
rancher-monitoring-grafana                                                               Bound    pvc-8badb46b-9e65-40a8-9456-dde583a36b57   50Gi       RWO            longhorn       8m56s