I would like to add another section 

6.8 Resolving pvc in pending state for ocs-storagecluster-cephfs not able to be bound

This issue can occur if you have redeploy your OCS without fully stopping or remove the csi provisionner pod.


Procedure 

1) Double check that the csi-cephfsplugin-provisioner show the following message.

oc logs -n openshift-storage  csi-cephfsplugin-provisioner-aaaaaaaaaa-bbbbb csi-provisioner|less

I0902 13:05:32.877114       1 event.go:282] Event(v1.ObjectReference{Kind:"PersistentVolumeClaim", Namespace:"test", Name:"mypvc", UID:"cccccccc-dddd-eeee-ffff-gggggggggggg", APIVersion:"v1", ResourceVersion:"359756", FieldPath:""}): type: 'Warning' reason: 'ProvisioningFailed' failed to provision volume with StorageClass "ocs-storagecluster-cephfs": rpc error: code = Internal desc = rados: ret=-2, No such file or directory: "subvolume group 'csi' does not exist"

2) restart the csi-provisionner pod 

$ oc delete pod -l app=csi-cephfsplugin-provisioner

$ oc delete pod -l app=csi-cephfsplugin

At this point the pvc should be able to move from pending to bounded.


Reported by: rhn-support-jpeyrard

https://access.redhat.com/documentation/en-us/red_hat_openshift_container_storage/4.8/html/troubleshooting_openshift_container_storage/troubleshooting-alerts-and-errors-in-openshift-container-storage_rhocs#annotations:97101e62-cbf4-4c42-83dd-27d8d0c64653