+man pages.
+.SH ADDITIONAL NOTES
+Lock recovery after a reboot is critical to maintaining data integrity
+and preventing unnecessary application hangs.
+.PP
+To help
+.B rpc.statd
+match SM_NOTIFY requests to NLM requests, a number of best practices
+should be observed, including:
+.IP
+The UTS nodename of your systems should match the DNS names that NFS
+peers use to contact them
+.IP
+The UTS nodenames of your systems should always be fully qualified domain names
+.IP
+The forward and reverse DNS mapping of the UTS nodenames should be
+consistent
+.IP
+The hostname the client uses to mount the server should match the server's
+.I mon_name
+in SM_NOTIFY requests it sends
+.IP
+The use of network addresses as a
+.I mon_name
+or a
+.I my_name
+string should be avoided when
+interoperating with non-Linux NFS implementations.
+.PP
+Unmounting an NFS file system does not necessarily stop
+either the NFS client or server from monitoring each other.
+Both may continue monitoring each other for a time in case subsequent
+NFS traffic between the two results in fresh mounts and additional
+file locking.
+.PP
+On Linux, if the
+.B lockd
+kernel module is unloaded during normal operation,
+all remote NFS peers are unmonitored.
+This can happen on an NFS client, for example,
+if an automounter removes all NFS mount
+points due to inactivity.
+.SS High-availability callouts
+.B rpc.statd
+can exec a special callout program during processing of
+successful SM_MON, SM_UNMON, and SM_UNMON_ALL requests.
+Such a program may be used in High Availability NFS (HA-NFS)
+environments to track lock state that may need to be migrated after
+a system reboot.
+.PP
+The name of the callout program is specified with the
+.B -H
+option.
+The program is run with 3 arguments:
+The first is either
+.B add-client
+or
+.B del-client
+depending on the reason for the callout.
+The second is the
+.I mon_name
+of the monitored peer.
+The third is the
+.I caller_name
+of the requesting lock manager.
+.SS IPv6 and TI-RPC support
+TI-RPC is a pre-requisite for supporting NFS on IPv6.
+If TI-RPC support is built into
+.BR rpc.statd ,
+it attempts to start listeners on network transports marked
+'visible' in
+.IR /etc/netconfig .
+As long as at least one network transport listener starts successfully,
+.B rpc.statd
+will operate.