223 lines
7.9 KiB
Groff
223 lines
7.9 KiB
Groff
.\" Copyright (c) 1992, 1993, 1994
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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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 8.2 (Berkeley) 3/27/94
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.\"
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.Dd March 27, 1994
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.Dt MOUNT_NFS 8
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.Os BSD 4.4
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.Sh NAME
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.Nm mount_nfs
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.Nd mount nfs file systems
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.Sh SYNOPSIS
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.Nm mount_nfs
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.Op Fl KMPTbcdiklqs
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.Op Fl D Ar deadthresh
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.Op Fl L Ar leaseterm
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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 m Ar realm
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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:path node
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.Sh DESCRIPTION
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The
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.Nm mount_nfs
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command
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calls the
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.Xr mount 2
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system call to prepare and graft a remote nfs file system (rhost: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 mount protocol as described in RFC 1094, Appendix A.
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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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Used with NQNFS to set the
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.Dq "dead server threshold"
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to the specified number of round trip timeout intervals.
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After a
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.Dq "dead server threshold"
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of retransmit timeouts,
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cached data for the unresponsive server is assumed to still be valid.
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Values may be set in the range of 1 - 9, with 9 referring to an
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.Dq "infinite dead threshold"
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(i.e. never assume cached data still valid).
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This option is not generally recommended and is really an experimental
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feature.
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.It Fl K
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Pass Kerberos authenticators to the server for client-to-server
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user-credential mapping.
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This may only be used over TCP mounts between 4.4BSD clients and servers.
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.It Fl L
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Used with NQNFS to set the lease term to the specified number of seconds.
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Only use this argument for mounts with a large round trip delay.
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Values are normally in the 10-30 second range.
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.It Fl M
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Assume that other clients are not writing a file concurrently with this client.
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This implements a slightly less strict consistency criteria than 4.3BSD-Reno
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did, that is more in line with most commercial client implementations.
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This is recommended for servers that do not support leasing.
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.It Fl P
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Use a reserved socket port number.
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This is useful for mounting servers that require clients to use a
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reserved port number.
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.It Fl R
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Set the retry count for doing the mount to the specified value.
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.It Fl T
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Use TCP transport instead of UDP.
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This is recommended for servers that are not on the same LAN cable as
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the client.
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(NB: This is NOT supported by most non-BSD servers.)
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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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This is recommended for 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 filesystem mount is not critical to multiuser operation.
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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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This must be used for servers that do not reply to requests from the
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standard port number.
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.It Fl d
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Do not estimate retransmit timeout dynamically.
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This may be useful for UDP mounts that exhibit high retry rates.
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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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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 k
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Used with NQNFS to specify
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.Dq get a lease
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for the file name being looked up.
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This is recommended unless the server is complaining about excessive
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lease load.
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.It Fl l
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Used with NQNFS to specify that the \fBReaddir_and_Lookup\fR RPC should
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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" ,
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but increases the lease load on the server.
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This is recommended unless the server is complaining about excessive
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lease load.
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.It Fl m
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Set the Kerberos realm to the string argument.
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Used with the
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.Fl K
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option for mounts to other realms.
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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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.It Fl q
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Use the leasing extensions to the protocol to maintain cache consistency.
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This protocol, referred to as Not Quite Nfs (NQNFS),
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is only supported by 4.4BSD servers.
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.It Fl r
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Set the read data size to the specified value.
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It should be a power of 2 greater than or equal to 1024.
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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
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A soft mount, which implies that file system calls will fail
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after \fBRetry\fR 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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.It Fl w
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Set the write data size to the specified value.
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Ditto the comments w.r.t. the
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.Fl r
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option, but using the
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.Dq "fragments dropped due to timeout"
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value on the server instead of the client.
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Note that both the
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.Fl r
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and
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.Fl w
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options should only be used as a last ditch effort at improving performance
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when mounting servers that do not support TCP mounts.
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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 mount 8
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.Sh BUGS
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Due to the way that Sun RPC is implemented on top of UDP (unreliable datagram)
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transport, tuning such mounts is really a black art that can only be expected
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to have limited success.
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For clients mounting servers that are not on the same
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LAN cable or that tend to be overloaded,
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TCP transport is strongly recommended,
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but unfortunately this is restricted to mostly 4.4BSD servers.
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