Using the -public option can create conditions that cause a mount to fail. Adding an NFS URL can also confuse the situation. The following list describes the specifics of how a file system is mounted when you use these options.
Public option with NFS URL – Forces the use of the public file handle. The mount fails if the public file handle is not supported.
Public option with regular path – Forces the use of the public file handle. The mount fails if the public file handle is not supported.
NFS URL only – Use the public file handle if this file handle is enabled on the NFS server. If the mount fails when using the public file handle, then try the mount with the MOUNT protocol.
Regular path only – Do not use the public file handle. The MOUNT protocol is used.