The mount(1M) command issues this message whenever it mounts a file system that does not have NFS locking, such as a standard SunOS 4.1 exported file sytem. Data loss is possible in applications that depend on locking.
On the remote SunOS 4.1 system, install the appropriate rpc.lockd jumbo patch to implement NFS locking. For the SunOS 4.1.4 system, install patch #102264; for the SunOS 4.1.3 system, install patch #100075; for earlier 4.1 releases, install patch #101817.