1997-03-11 12:40:45 +00:00
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.\" Copyright (c) 1992, 1993, 1994, 1995
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1994-05-26 06:35:07 +00:00
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1997-03-11 12:40:45 +00:00
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.\" @(#)mount_nfs.8 8.3 (Berkeley) 3/29/95
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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2003-05-17 22:53:44 +00:00
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.\"
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2005-12-25 10:36:30 +00:00
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.Dd December 25, 2005
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1994-05-26 06:35:07 +00:00
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.Dt MOUNT_NFS 8
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2001-07-10 11:04:34 +00:00
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.Os
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1994-05-26 06:35:07 +00:00
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.Sh NAME
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.Nm mount_nfs
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2003-05-17 22:53:44 +00:00
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.Nd mount NFS file systems
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1994-05-26 06:35:07 +00:00
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.Sh SYNOPSIS
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2000-11-20 16:52:27 +00:00
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.Nm
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2005-02-10 09:19:34 +00:00
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.Op Fl 23bcdiLlNPsTU
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1994-05-26 06:35:07 +00:00
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.Op Fl a Ar maxreadahead
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2005-02-10 09:19:34 +00:00
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.Op Fl D Ar deadthresh
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1994-05-26 06:35:07 +00:00
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.Op Fl g Ar maxgroups
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2005-02-10 09:19:34 +00:00
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.Op Fl I Ar readdirsize
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1994-05-26 06:35:07 +00:00
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.Op Fl o Ar options
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2005-02-10 09:19:34 +00:00
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.Op Fl R Ar retrycnt
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1994-05-26 06:35:07 +00:00
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.Op Fl r Ar readsize
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.Op Fl t Ar timeout
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.Op Fl w Ar writesize
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.Op Fl x Ar retrans
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2001-02-01 16:38:02 +00:00
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.Ar rhost : Ns Ar path node
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1994-05-26 06:35:07 +00:00
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.Sh DESCRIPTION
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The
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1998-07-06 07:15:53 +00:00
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.Nm
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2002-07-06 19:34:18 +00:00
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utility calls the
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2007-01-23 07:17:10 +00:00
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.Xr nmount 2
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2003-05-17 22:53:44 +00:00
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system call to prepare and graft a remote NFS file system
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2001-02-01 16:38:02 +00:00
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.Pq Ar rhost : Ns Ar path
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2002-08-21 18:11:48 +00:00
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on to the file system tree at the point
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2001-02-01 16:38:02 +00:00
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.Ar node .
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1994-05-26 06:35:07 +00:00
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This command is normally executed by
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.Xr mount 8 .
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1995-06-27 11:07:30 +00:00
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It implements the mount protocol as described in RFC 1094, Appendix A and
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.%T "NFS: Network File System Version 3 Protocol Specification" ,
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Appendix I.
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1994-05-26 06:35:07 +00:00
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.Pp
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2001-07-21 15:38:37 +00:00
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By default,
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.Nm
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keeps retrying until the mount succeeds.
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2002-08-21 18:11:48 +00:00
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This behaviour is intended for file systems listed in
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2001-07-21 15:38:37 +00:00
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.Xr fstab 5
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that are critical to the boot process.
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2002-08-21 18:11:48 +00:00
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For non-critical file systems, the
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2001-07-21 15:38:37 +00:00
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.Fl b
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and
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.Fl R
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flags provide mechanisms to prevent the boot process from hanging
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if the server is unavailable.
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.Pp
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2002-08-21 18:11:48 +00:00
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If the server becomes unresponsive while an NFS file system is
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mounted, any new or outstanding file operations on that file system
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2001-07-21 15:38:37 +00:00
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will hang uninterruptibly until the server comes back.
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To modify this default behaviour, see the
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.Fl i
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and
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.Fl s
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flags.
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.Pp
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1994-05-26 06:35:07 +00:00
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The options are:
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.Bl -tag -width indent
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1997-04-18 16:23:10 +00:00
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.It Fl 2
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Use the NFS Version 2 protocol (the default is to try version 3 first
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2003-05-17 22:53:44 +00:00
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then version 2).
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Note that NFS version 2 has a file size limit of 2 gigabytes.
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1995-06-27 11:07:30 +00:00
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.It Fl 3
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1997-04-18 16:23:10 +00:00
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Use the NFS Version 3 protocol.
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2007-01-23 07:17:10 +00:00
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.It Fl 4
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Use the NFS Version 4 protocol.
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1994-05-26 06:35:07 +00:00
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.It Fl D
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2001-09-18 23:34:44 +00:00
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Set the
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1994-05-26 06:35:07 +00:00
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.Dq "dead server threshold"
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2001-09-18 23:34:44 +00:00
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to the specified number of round trip timeout intervals before a
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.Dq "server not responding"
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message is displayed.
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1995-06-27 11:07:30 +00:00
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.It Fl I
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2000-03-01 11:27:47 +00:00
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Set the readdir read size to the specified value.
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The value should normally
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2003-05-17 22:53:44 +00:00
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be a multiple of
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.Dv DIRBLKSIZ
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that is <= the read size for the mount.
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2001-11-12 02:33:52 +00:00
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.It Fl L
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Do
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.Em not
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forward
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.Xr fcntl 2
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locks over the wire.
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All locks will be local and not seen by the server
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2003-05-17 22:53:44 +00:00
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and likewise not seen by other NFS clients.
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This removes the need to run the
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2001-11-12 02:33:52 +00:00
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.Xr rpcbind 8
|
2003-05-17 22:53:44 +00:00
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service and the
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2001-11-12 02:33:52 +00:00
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.Xr rpc.statd 8
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and
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.Xr rpc.lockd 8
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servers on the client.
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2001-11-12 02:43:56 +00:00
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Note that this option will only be honored when performing the
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initial mount, it will be silently ignored if used while updating
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the mount options.
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1997-10-19 16:40:01 +00:00
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.It Fl N
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Do
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.Em not
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use a reserved socket port number (see below).
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1994-05-26 06:35:07 +00:00
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.It Fl P
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Use a reserved socket port number.
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1997-10-19 16:40:01 +00:00
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This flag is obsolete, and only retained for compatibility reasons.
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Reserved port numbers are used by default now.
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2000-03-02 14:54:02 +00:00
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(For the rare case where the client has a trusted root account
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1996-01-29 23:52:43 +00:00
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but untrustworthy users and the network cables are in secure areas this does
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1995-06-27 11:07:30 +00:00
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help, but for normal desktop clients this does not apply.)
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1994-05-26 06:35:07 +00:00
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.It Fl R
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2001-07-19 21:11:48 +00:00
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Set the mount retry count to the specified value.
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2001-07-21 15:38:37 +00:00
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The default is a retry count of zero, which means to keep retrying
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forever.
|
2001-07-19 21:11:48 +00:00
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There is a 60 second delay between each attempt.
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1994-05-26 06:35:07 +00:00
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.It Fl T
|
2008-02-11 23:23:21 +00:00
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Use TCP transport.
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This is the default option, as it provides for increased reliability on both
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LAN and WAN configurations compared to UDP.
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Some old NFS servers do not support this method; UDP mounts may be required
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for interoperability.
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1995-06-27 11:07:30 +00:00
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.It Fl U
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Force the mount protocol to use UDP transport, even for TCP NFS mounts.
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2001-08-14 10:01:54 +00:00
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(Necessary for some old
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.Bx
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servers.)
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1994-05-26 06:35:07 +00:00
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.It Fl a
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Set the read-ahead count to the specified value.
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This may be in the range of 0 - 4, and determines how many blocks
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will be read ahead when a large file is being read sequentially.
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1995-06-27 11:07:30 +00:00
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Trying a value greater than 1 for this is suggested for
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mounts with a large bandwidth * delay product.
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1994-05-26 06:35:07 +00:00
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.It Fl b
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If an initial attempt to contact the server fails, fork off a child to keep
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trying the mount in the background.
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Useful for
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.Xr fstab 5 ,
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2002-08-21 18:11:48 +00:00
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where the file system mount is not critical to multiuser operation.
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1994-05-26 06:35:07 +00:00
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.It Fl c
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For UDP mount points, do not do a
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.Xr connect 2 .
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2003-01-27 20:12:32 +00:00
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This must be used if the server does not reply to requests from the standard
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NFS port number 2049 or replies to requests using a different IP address
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(which can occur if the server is multi-homed).
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Setting the
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.Va vfs.nfs.nfs_ip_paranoia
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sysctl to 0 will make this option the default.
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1994-05-26 06:35:07 +00:00
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.It Fl d
|
1995-06-27 11:07:30 +00:00
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Turn off the dynamic retransmit timeout estimator.
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This may be useful for UDP mounts that exhibit high retry rates,
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since it is possible that the dynamically estimated timeout interval is too
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short.
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1994-05-26 06:35:07 +00:00
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.It Fl g
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Set the maximum size of the group list for the credentials to the
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specified value.
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This should be used for mounts on old servers that cannot handle a
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group list size of 16, as specified in RFC 1057.
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Try 8, if users in a lot of groups cannot get response from the mount
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point.
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.It Fl i
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2002-08-21 18:11:48 +00:00
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Make the mount interruptible, which implies that file system calls that
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1994-05-26 06:35:07 +00:00
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are delayed due to an unresponsive server will fail with EINTR when a
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termination signal is posted for the process.
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.It Fl l
|
1995-06-27 11:07:30 +00:00
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Used with NQNFS and NFSV3 to specify that the \fBReaddirPlus\fR RPC should
|
1994-05-26 06:35:07 +00:00
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be used.
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This option reduces RPC traffic for cases such as
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.Dq "ls -l" ,
|
1995-06-27 11:07:30 +00:00
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|
but tends to flood the attribute and name caches with prefetched entries.
|
2000-03-01 11:27:47 +00:00
|
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|
Try this option and see whether performance improves or degrades.
|
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Probably
|
1995-06-27 11:07:30 +00:00
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|
most useful for client to server network interconnects with a large bandwidth
|
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times delay product.
|
1994-05-26 06:35:07 +00:00
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.It Fl o
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Options are specified with a
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.Fl o
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flag followed by a comma separated string of options.
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See the
|
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|
.Xr mount 8
|
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|
man page for possible options and their meanings.
|
2003-05-17 22:53:44 +00:00
|
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|
The following NFS specific options are also available:
|
1995-06-14 17:41:04 +00:00
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|
.Bl -tag -width indent
|
2003-05-17 22:53:44 +00:00
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.It Cm port Ns = Ns Aq Ar port_number
|
1995-06-14 17:41:04 +00:00
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Use specified port number for NFS requests.
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The default is to query the portmapper for the NFS port.
|
2003-05-17 22:53:44 +00:00
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.It Cm acregmin Ns = Ns Aq Ar seconds
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.It Cm acregmax Ns = Ns Aq Ar seconds
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.It Cm acdirmin Ns = Ns Aq Ar seconds
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.It Cm acdirmax Ns = Ns Aq Ar seconds
|
1998-07-06 07:15:53 +00:00
|
|
|
When attributes of files are cached, a timeout calculated to determine
|
2003-05-17 22:53:44 +00:00
|
|
|
whether a given cache entry has expired.
|
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|
These four values determine the upper and lower bounds of the timeouts for
|
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.Dq directory
|
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attributes and
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.Dq regular
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(ie: everything else).
|
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The default values are 3 -> 60 seconds
|
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for regular files, and 30 -> 60 seconds for directories.
|
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|
The algorithm to calculate the timeout is based on the age of the file.
|
|
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|
The older the file,
|
1998-05-19 07:18:28 +00:00
|
|
|
the longer the cache is considered valid, subject to the limits above.
|
2003-05-17 22:53:44 +00:00
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.It Cm noinet4 , noinet6
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Disables
|
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.Dv AF_INET
|
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or
|
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.Dv AF_INET6
|
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connections.
|
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|
Useful for hosts that have
|
2003-03-25 01:25:30 +00:00
|
|
|
both an A record and an AAAA record for the same name.
|
1995-06-14 17:41:04 +00:00
|
|
|
.El
|
2003-09-10 08:24:33 +00:00
|
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.Pp
|
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.Sy Historic Fl o Sy Options
|
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.Pp
|
1996-10-22 21:56:58 +00:00
|
|
|
Use of these options is deprecated, they are only mentioned here for
|
|
|
|
compatibility with historic versions of
|
2000-11-20 16:52:27 +00:00
|
|
|
.Nm .
|
2003-09-10 08:24:33 +00:00
|
|
|
.Bl -tag -width ".Cm dumbtimer"
|
2003-05-17 22:53:44 +00:00
|
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.It Cm bg
|
1996-10-22 21:56:58 +00:00
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Same as
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.Fl b .
|
2007-03-05 14:47:54 +00:00
|
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.It Cm fg
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Same as not specifying
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.Fl b .
|
2003-05-17 22:53:44 +00:00
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.It Cm conn
|
2001-07-15 07:53:42 +00:00
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Same as not specifying
|
1996-10-22 21:56:58 +00:00
|
|
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.Fl c .
|
2003-05-17 22:53:44 +00:00
|
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.It Cm dumbtimer
|
1996-10-22 21:56:58 +00:00
|
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Same as
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.Fl d .
|
2003-05-17 22:53:44 +00:00
|
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.It Cm intr
|
1996-10-22 21:56:58 +00:00
|
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Same as
|
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.Fl i .
|
2003-05-17 22:53:44 +00:00
|
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.It Cm lockd
|
2001-11-12 02:33:52 +00:00
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|
|
Same as not specifying
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.Fl L .
|
2003-05-17 22:53:44 +00:00
|
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.It Cm nfsv2
|
1997-04-18 16:23:10 +00:00
|
|
|
Same as
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.Fl 2 .
|
2003-05-17 22:53:44 +00:00
|
|
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.It Cm nfsv3
|
1996-10-22 21:56:58 +00:00
|
|
|
Same as
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.Fl 3 .
|
2003-05-17 22:53:44 +00:00
|
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.It Cm rdirplus
|
1996-10-22 21:56:58 +00:00
|
|
|
Same as
|
|
|
|
.Fl l .
|
2003-05-17 22:53:44 +00:00
|
|
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.It Cm mntudp
|
1996-10-22 21:56:58 +00:00
|
|
|
Same as
|
|
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|
.Fl U .
|
2003-05-17 22:53:44 +00:00
|
|
|
.It Cm resvport
|
1996-10-22 21:56:58 +00:00
|
|
|
Same as
|
|
|
|
.Fl P .
|
2003-05-17 22:53:44 +00:00
|
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.It Cm soft
|
1996-10-22 21:56:58 +00:00
|
|
|
Same as
|
|
|
|
.Fl s .
|
2007-03-05 14:47:54 +00:00
|
|
|
.It Cm hard
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Same as not specifying
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.Fl s .
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2003-05-17 22:53:44 +00:00
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.It Cm tcp
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1996-10-22 21:56:58 +00:00
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Same as
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2001-02-01 16:38:02 +00:00
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.Fl T .
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1996-10-22 21:56:58 +00:00
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.El
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1994-05-26 06:35:07 +00:00
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.It Fl r
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Set the read data size to the specified value.
|
1995-06-27 11:07:30 +00:00
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It should normally be a power of 2 greater than or equal to 1024.
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1994-05-26 06:35:07 +00:00
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This should be used for UDP mounts when the
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.Dq "fragments dropped due to timeout"
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value is getting large while actively using a mount point.
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(Use
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.Xr netstat 1
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with the
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.Fl s
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option to see what the
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.Dq "fragments dropped due to timeout"
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value is.)
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See the
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.Fl w
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|
option as well.
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.It Fl s
|
2002-08-21 18:11:48 +00:00
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A soft mount, which implies that file system calls will fail
|
2003-05-17 22:53:44 +00:00
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after
|
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.Ar retrycnt
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round trip timeout intervals.
|
1994-05-26 06:35:07 +00:00
|
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.It Fl t
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|
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|
Set the initial retransmit timeout to the specified value.
|
|
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May be useful for fine tuning UDP mounts over internetworks
|
|
|
|
with high packet loss rates or an overloaded server.
|
|
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|
Try increasing the interval if
|
|
|
|
.Xr nfsstat 1
|
2002-08-21 18:11:48 +00:00
|
|
|
shows high retransmit rates while the file system is active or reducing the
|
1994-05-26 06:35:07 +00:00
|
|
|
value if there is a low retransmit rate but long response delay observed.
|
2003-05-17 22:53:44 +00:00
|
|
|
(Normally, the
|
|
|
|
.Fl d
|
|
|
|
option should be specified when using this option to manually
|
1995-06-27 11:07:30 +00:00
|
|
|
tune the timeout
|
|
|
|
interval.)
|
1994-05-26 06:35:07 +00:00
|
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|
.It Fl w
|
|
|
|
Set the write data size to the specified value.
|
2004-07-02 21:45:06 +00:00
|
|
|
Ditto the comments w.r.t.\& the
|
1994-05-26 06:35:07 +00:00
|
|
|
.Fl r
|
|
|
|
option, but using the
|
|
|
|
.Dq "fragments dropped due to timeout"
|
|
|
|
value on the server instead of the client.
|
|
|
|
Note that both the
|
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|
|
.Fl r
|
|
|
|
and
|
|
|
|
.Fl w
|
|
|
|
options should only be used as a last ditch effort at improving performance
|
|
|
|
when mounting servers that do not support TCP mounts.
|
|
|
|
.It Fl x
|
|
|
|
Set the retransmit timeout count for soft mounts to the specified value.
|
|
|
|
.El
|
|
|
|
.Sh SEE ALSO
|
2007-01-23 07:17:10 +00:00
|
|
|
.Xr nmount 2 ,
|
1994-05-26 06:35:07 +00:00
|
|
|
.Xr unmount 2 ,
|
|
|
|
.Xr fstab 5 ,
|
2000-01-13 21:47:21 +00:00
|
|
|
.Xr mount 8 ,
|
2000-07-18 17:31:00 +00:00
|
|
|
.Xr nfsd 8 ,
|
2000-07-18 17:34:23 +00:00
|
|
|
.Xr nfsiod 8 ,
|
|
|
|
.Xr showmount 8
|