198 lines
6.6 KiB
Groff
198 lines
6.6 KiB
Groff
.\" Copyright (c) 1992, 1993, 1994, 1995
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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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.\" @(#)mount_nfs.8 8.3 (Berkeley) 3/29/95
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.\" $FreeBSD$
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.\"
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.Dd November 14, 2003
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.Dt MOUNT_NFS4 8
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.Os
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.Sh NAME
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.Nm mount_nfs4
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.Nd mount NFSv4 file systems
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.Sh SYNOPSIS
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.Nm
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.Op Fl NPTUbcdiLls
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.Op Fl D Ar deadthresh
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.Op Fl I Ar readdirsize
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.Op Fl R Ar retrycnt
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.Op Fl a Ar maxreadahead
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.Op Fl g Ar maxgroups
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.Op Fl o Ar options
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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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.Ar rhost : Ns Ar path node
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.Sh DESCRIPTION
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The
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.Nm
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utility calls the
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.Xr mount 2
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system call to prepare and graft a remote NFSv4 file system
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.Pq Ar rhost : Ns Ar path
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on to the file system tree at the point
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.Ar node .
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This command is normally executed by
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.Xr mount 8 .
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It implements the NFSv4 protocol as described in RFC 3530,
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.%T "NFS version 4 Protocol."
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.Pp
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If the server becomes unresponsive while an NFSv4 file system is
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mounted, any new or outstanding file operations on that file system
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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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The options are:
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.Bl -tag -width indent
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.It Fl D
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Set the
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.Dq "dead server threshold"
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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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.It Fl I
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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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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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.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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.It Fl P
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Use a reserved socket port number.
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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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(For the rare case where the client has a trusted root account
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but untrustworthy users and the network cables are in secure areas this does
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help, but for normal desktop clients this does not apply.)
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.It Fl R
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Set the mount retry count to the specified value.
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The default is a retry count of zero, which means to keep retrying
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forever.
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There is a 60 second delay between each attempt.
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.It Fl T
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Use TCP transport. This is the default.
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.It Fl U
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Force the mount protocol to use UDP transport.
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This is not supported by the version 4 protocol and is provided only for
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debugging purposes.
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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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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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.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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where the file system mount is not critical to multiuser operation.
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.It Fl i
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Make the mount interruptible, which implies that file system calls that
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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 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.
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The following NFS specific options are also available:
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.Bl -tag -width indent
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.It Cm port Ns = Ns Aq Ar port_number
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Use specified port number for NFSv4 requests.
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The default is to use port 2049.
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Set this to 0 to query the portmapper for the NFSv4 port.
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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
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When attributes of files are cached, a timeout calculated to determine
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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,
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the longer the cache is considered valid, subject to the limits above.
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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
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both an A record and an AAAA record for the same name.
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.El
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.It Fl s
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A soft mount, which implies that file system calls will fail
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after
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.Ar retrycnt
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round trip timeout intervals.
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.It Fl t
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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
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with high packet loss rates or an overloaded server.
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Try increasing the interval if
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.Xr nfsstat 1
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shows high retransmit rates while the file system is active or reducing the
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value if there is a low retransmit rate but long response delay observed.
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(Normally, the
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.Fl d
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option should be specified when using this option to manually
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tune the timeout
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interval.)
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.It Fl x
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Set the retransmit timeout count for soft mounts to the specified value.
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.El
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.Sh SEE ALSO
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.Xr mount 2 ,
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.Xr unmount 2 ,
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.Xr fstab 5 ,
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.Xr idmapd 8 ,
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.Xr mount 8 ,
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.Xr mount_nfs 8 ,
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.Xr nfsd 8 ,
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.Xr nfsiod 8
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.Sh BUGS
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This version of the NFSv4 client, while functional, is a long way
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from compliance with RFC 3530. It lacks lock state, reboot recovery,
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delegation, gss, and many other mandatory items from the RFC.
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