username::
-RBD user Id. Optional, only needed if Ceph is not running on the PVE cluster.
+RBD user ID. Optional, only needed if Ceph is not running on the PVE cluster.
+Note that only the user ID should be used. The "client." type prefix must be
+left out.
krbd::
-Enforce access to rados block devies through the krbd kernel module. Optional.
+Enforce access to rados block devices through the krbd kernel module. Optional.
NOTE: Containers will use `krbd` independent of the option value.