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 mount_nfs(1M)                                                 mount_nfs(1M)




 NAME    [Toc]    [Back]
      mount_nfs: mount, umount - mount and unmount NFS file systems

 SYNOPSIS    [Toc]    [Back]
      /usr/sbin/mount [-l] [-p|-v]

      /usr/sbin/mount -a [-F nfs] [-eQ]

      /usr/sbin/mount [-F nfs] [-eQrV] [-o specific_options]
           {host:path|directory}

      /usr/sbin/mount [-F nfs] [-eQrV] [-o specific_options]
           host:path directory

      /usr/sbin/umount -a [-f] [-F nfs] [-h host] [-v]

      /usr/sbin/umount [-f] [-v] [-V] {host:path|directory}

 DESCRIPTION    [Toc]    [Back]
      The mount command mounts file systems.  Only a superuser can mount
      file systems.  Other users can use mount to list mounted file systems.

      The mount command attaches host:path to directory.  host is a remote
      system, path is a directory on this remote system and directory is a
      directory on the local file tree.  directory must already exist, be
      given as an absolute path name and will become the name of the root of
      the newly mounted file system.  If either host:path or directory is
      omitted, mount attempts to determine the missing value from an entry
      in the /etc/fstab file.  mount can be invoked on any removable file
      system, except /.

      If mount is invoked without any arguments, it lists all of the mounted
      file systems from the file system mount table, /etc/mnttab.  The
      umount command unmounts mounted file systems.  Only a superuser can
      unmount file systems.

    Options    [Toc]    [Back]
      -r   Mount the specified file system read-only.

      -o specific_options
           Set file system specific options according to a comma-separated
           list chosen from words below.

           rw|ro          resource is mounted read-write or read-only.  The
                          default is rw.

           suid|nosuid    Setuid execution allowed or disallowed.  The
                          default is suid.

           remount        If a file system is mounted read-only, remounts
                          the file system read-write.



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 mount_nfs(1M)                                                 mount_nfs(1M)




           bg|fg          If the first attempt fails, retry in the
                          background, or, in the foreground.  The default is
                          fg.

           quota          Enables quota(1M) to check whether the user is
                          over quota on this file system; if the file system
                          has quotas enabled on the server, quotas will
                          still be checked for operations on this file
                          system.

           noquota        Prevent quota(1M) from checking whether the user
                          exceeded the quota on this file system; if the
                          file system has quotas enabled on the server,
                          quotas will still be checked  for operations on
                          this file system.

           retry=n        The number of times to retry the mount operation.
                          The default is 1.

           vers=NFS_version_number
                          By default, the version of NFS protocol used
                          between the client and the server is the highest
                          one available on both systems. If the NFS server
                          does not support NFS Version 3, then the NFS mount
                          will use NFS Version 2 .

           port=n         Set server UDP port number to n (the default is
                          the port customarily used for NFS servers).

           proto=transp   Use the transport protocol transp for this mount.
                          Valid values for transp are tcp (connectionoriented)
 and udp (connectionless).  The default
                          behavior is to attempt a tcp connection.  If the
                          tcp connection attempt fails when defaulting to
                          tcp, a udp connection will be attempted.

           grpid          By default, the GID associated with a newly
                          created file will obey the System V semantics;
                          that is, the GID is set to the effective GID of
                          the calling process.  This behavior may be
                          overridden on a per-directory basis by setting the
                          set-GID bit of the parent directory; in this case,
                          the GID of a newly created file is set to the GID
                          of the parent directory (see open(2) and
                          mkdir(2)).  Files created on file systems that are
                          mounted with the grpid option will obey BSD
                          semantics independent of whether the set-GID bit
                          of the parent directory is set; that is, the GID
                          is unconditionally inherited from that of the
                          parent directory.




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 mount_nfs(1M)                                                 mount_nfs(1M)




           rsize=n        Set the read buffer size to n bytes.  The default
                          value is set by kernel.

           wsize=n        Set the write buffer size to n bytes.  The default
                          value is set by kernel.

           timeo=n        Set the NFS timeout to n tenths of a second.  The
                          default value is set by kernel.

           retrans=n      Set the number of NFS retransmissions to n.  The
                          default value is 5.

           soft|hard      Return an error if the server does not respond, or
                          continue the retry request until the server
                          responds.  The default value is hard.

           intr|nointr    Allow (do not allow) keyboard interrupts to kill a
                          process that is hung while waiting for a response
                          on a hard-mounted file system.  The default is
                          intr.

           noac           Suppress attribute caching.

           nocto          Suppress fresh attributes when opening a file.

           forcedirectio  If forcedirectio is specified, then for the
                          duration of the mount, forced direct I/O is used.
                          If the filesystem is mounted using forcedirectio,
                          data is transferred directly between client and
                          server, with no buffering on the client.
                          forcedirectio is a performance option that is of
                          benefit only in large sequential data transfers.
                          Running applications and mapping memory with
                          mmap() are not supported over forcedirectio mount
                          points.  The default behavior is no forcedirectio.

           devs|nodevs    Allow (do not allow) access to local devices.  The
                          default is devs.

           acdirmax=n     Hold cached attributes for no more than n seconds
                          after directory update.  The default value is 60.

           acdirmin=n     Hold cached attributes for at least n seconds
                          after directory update.  The default value is 30.

           acregmax=n     Hold cached attributes for no more than n seconds
                          after file modification.  The default value is 60.

           acregmin=n     Hold cached attributes for at least n seconds
                          after file modification.  The default value is 3.




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 mount_nfs(1M)                                                 mount_nfs(1M)




           actimeo=n      Set min and max times for regular files and
                          directories to n seconds.  actimeo has no default;
                          it sets acregmin, acregmax, acdirmin, and acdirmax
                          to the value specified.

      -O   Overlay mount.  Allow the file system to be mounted over an
           existing mount point, making the underlying file system
           inaccessible.  If a mount is attempted on a pre-existing mount
           point without setting this flag, the mount will fail, producing
           the error device busy.

    Options (umount)    [Toc]    [Back]
      umount recognizes the following options:

           -a             Attempt to unmount all file systems described in
                          /etc/mnttab.  All optional fields in /etc/mnttab
                          must be included and supported.  If -F nfs option
                          is specified, all NFS file systems in /etc/mnttab
                          are unmounted.  File systems are not necessarily
                          unmounted in the order listed in /etc/mnttab.

           -f             Forcibly unmount a file system.  Without this
                          option, umount does not allow a file system to be
                          unmounted if a file on the file system is busy.
                          Using this option can cause data loss for open
                          files; programs which access files after the file
                          system has been unmounted will get an error (EIO).

           -F nfs         Specify the NFS file system type (see fstyp(1M)).

           -h host        Unmount only those file systems listed in
                          /etc/mnttab that are remote-mounted from host.

           -v             Verbose mode.  Write a message to standard output
                          indicating which file system is being unmounted.

           -V             Echo the completed command line, but performs no
                          other action.  The command line is generated by
                          incorporating the user-specified options and other
                          information derived from /etc/fstab.  This option
                          allows the user to verify the command line.

    NFS File Systems    [Toc]    [Back]
      Background vs. Foreground
           File systems mounted with the bg option indicate that mount is to
           retry in the background if the server's mount daemon (mountd(1M))
           does not respond.  mount retries the request up to the count
           specified in the retry=n option.  Once the file system is
           mounted, each NFS request made in the kernel waits timeo=n tenths
           of a second for a response.  If no response arrives, the time-out
           is multiplied by 2 and the request is retransmitted.  When the



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 mount_nfs(1M)                                                 mount_nfs(1M)




           number of retransmissions has reached the number specified in the
           retrans=n option, a file system mounted with the soft option
           returns an error on the request; one mounted with the hard option
           prints a warning message and continues to retry the request.

      Hard vs. Soft    [Toc]    [Back]
           File systems that are mounted read-write or that contain
           executable files should always be mounted with the hard option.
           Applications using soft mounted file systems may incur unexpected
           I/O errors.

           To improve NFS read performance, files and file attributes are
           cached.  File modification times get updated whenever a write
           occurs.  However, file access times may be temporarily out-ofdate
 until the cache gets refreshed.  The attribute cache retains
           file attributes on the client.  Attributes for a file are
           assigned a time to be flushed.  If the file is modified before
           the flush time, then the flush time is extended by the time since
           the last modification (under the assumption that files that
           changed recently are likely to change soon).  There is a minimum
           and maximum flush time extension for regular files and for
           directories.  Setting actimeo=n sets flush time to n seconds for
           both regular files and directories.

 EXAMPLES    [Toc]    [Back]
      To mount an NFS file system:

           mount serv:/usr/src /usr/src

      To mount an NFS file system readonly with no suid privileges:

           mount -r -o nosuid serv:/usr/src /usr/src

      To mount an NFS file system over Version 3:

           mount -o vers=3 serv:/usr/src /usr/src

      To unmount all file systems imported from a given host, enter the
      following command as root:

           umount -h mysystem.home.work.com -a

      The hostname must match what is in /etc/mnttab exactly (as shown by
      the bdf command). For example, if bdf shows:

           mysystem:/projects,

      the umount command would be

           umount -h mysystem -a.




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 mount_nfs(1M)                                                 mount_nfs(1M)




 FILES    [Toc]    [Back]
      /etc/mnttab         table of mounted file systems.
      /etc/fstab          list of default parameters for each file system.

 SEE ALSO    [Toc]    [Back]
      fsclean(1M), mount(1M), quotaon(1M), mount(2), fstab(4), mnttab(4),
      fs_wrapper(5), quota(5).

 STANDARDS CONFORMANCE    [Toc]    [Back]
      mount: SVID3

      umount: SVID3


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