If Virtual Storage Console for VMware vSphere displays a storage system name as "unknown", you can modify the credentials and add the management IP address of the storage system in the Modify Storage System pop-up box.
An "unknown" name can occur if an NFS datastore is mounted over a private network.
If you are running clustered Data ONTAP and working with NFS datastores that are mounted using an NFS data LIF, this issue can occur with either a private network or a public network.