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NAME    [Toc]    [Back]

     mount_nfs4 -- mount NFSv4 file systems

SYNOPSIS    [Toc]    [Back]

     mount_nfs4 [-NPTUbcdiLls] [-D deadthresh] [-I readdirsize] [-R retrycnt]
		[-a maxreadahead] [-g maxgroups] [-o options] [-r readsize]
		[-t timeout] [-w writesize] [-x retrans] rhost:path node

DESCRIPTION    [Toc]    [Back]

     The mount_nfs4 utility calls the mount(2) system call to prepare and
     graft a remote NFSv4 file system (rhost:path) on to the file system tree
     at the point node.  This command is normally executed by mount(8).  It
     implements the NFSv4 protocol as described in RFC 3530, NFS version 4

     If the server becomes unresponsive while an NFSv4 file system is mounted,
     any new or outstanding file operations on that file system will hang
     uninterruptibly until the server comes back.  To modify this default behaviour,
 see the -i and -s flags.

     The options are:

     -D      Set the ``dead server threshold'' to the specified number of
	     round trip timeout intervals before a ``server not responding''
	     message is displayed.

     -I      Set the readdir read size to the specified value.	The value
	     should normally be a multiple of DIRBLKSIZ that is <= the read
	     size for the mount.

     -N      Do not use a reserved socket port number (see below).

     -P      Use a reserved socket port number.  This flag is obsolete, and
	     only retained for compatibility reasons.  Reserved port numbers
	     are used by default now.  (For the rare case where the client has
	     a trusted root account but untrustworthy users and the network
	     cables are in secure areas this does help, but for normal desktop
	     clients this does not apply.)

     -R      Set the mount retry count to the specified value.	The default is
	     a retry count of zero, which means to keep retrying forever.
	     There is a 60 second delay between each attempt.

     -T      Use TCP transport. This is the default.

     -U      Force the mount protocol to use UDP transport.  This is not supported
 by the version 4 protocol and is provided only for debugging

     -a      Set the read-ahead count to the specified value.  This may be in
	     the range of 0 - 4, and determines how many blocks will be read
	     ahead when a large file is being read sequentially.  Trying a
	     value greater than 1 for this is suggested for mounts with a
	     large bandwidth * delay product.

     -b      If an initial attempt to contact the server fails, fork off a
	     child to keep trying the mount in the background.	Useful for
	     fstab(5), where the file system mount is not critical to multiuser

     -i      Make the mount interruptible, which implies that file system
	     calls that are delayed due to an unresponsive server will fail
	     with EINTR when a termination signal is posted for the process.

     -o      Options are specified with a -o flag followed by a comma separated
 string of options.  See the mount(8) man page for possible
	     options and their meanings.  The following NFS specific options
	     are also available:

		     Use specified port number for NFSv4 requests.  The
		     default is to use port 2049.  Set this to 0 to query the
		     portmapper for the NFSv4 port.




		     When attributes of files are cached, a timeout calculated
		     to determine whether a given cache entry has expired.
		     These four values determine the upper and lower bounds of
		     the timeouts for ``directory'' attributes and ``regular''
		     (ie: everything else).  The default values are 3 -> 60
		     seconds for regular files, and 30 -> 60 seconds for
		     directories.  The algorithm to calculate the timeout is
		     based on the age of the file.  The older the file, the
		     longer the cache is considered valid, subject to the limits

	     noinet4, noinet6
		     Disables AF_INET or AF_INET6 connections.	Useful for
		     hosts that have both an A record and an AAAA record for
		     the same name.

     -s      A soft mount, which implies that file system calls will fail
	     after retrycnt round trip timeout intervals.

     -t      Set the initial retransmit timeout to the specified value.  May
	     be useful for fine tuning UDP mounts over internetworks with high
	     packet loss rates or an overloaded server.  Try increasing the
	     interval if nfsstat(1) shows high retransmit rates while the file
	     system is active or reducing the value if there is a low retransmit
 rate but long response delay observed.  (Normally, the -d
	     option should be specified when using this option to manually
	     tune the timeout interval.)

     -x      Set the retransmit timeout count for soft mounts to the specified

SEE ALSO    [Toc]    [Back]

     mount(2), unmount(2), fstab(5), idmapd(8), mount(8), mount_nfs(8),
     nfsd(8), nfsiod(8)

BUGS    [Toc]    [Back]

     This version of the NFSv4 client, while functional, is a long way from
     compliance with RFC 3530. It lacks lock state, reboot recovery, delegation,
 gss, and many other mandatory items from the RFC.

FreeBSD 5.2.1		       November 14, 2003		 FreeBSD 5.2.1
[ Back ]
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