mount(1m)
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mount, umount
mount and dismount file systems
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SYNTAX
/etc/mount
/etc/mount -p
/etc/mount -a[-fv][-t type ]
/etc/mount [-frv] [-t type ] [-o options ]
/etc/umount [ -av ] [ fsname | dir ] ...
DESCRIPTION
File systems other than root (/) are considered removable because
they can be either available or unavailable to users. Mount and
umount maintain a table of mounted file systems in /etc/mnttab,
described in mnttab(4). If invoked without an argument, mount
displays the table. Only a superuser can use umount to dismount
file systems. The mount command announces to the system that a
file system fsname is to be attached to the file tree at the
directory dir. The directory dir must already exist. It becomes
the name of the root of the newly mounted file system. The
previous contents of dir are hidden until the file system fsname
is unmounted. In the case of an NFS mount, a colon (:) is used
to separate the server hostname and the pathname of the directory
on the server.
The command umount announces to the system that the file system
fsname previously mounted on directory dir should be removed.
Either the file system name fsname or the mounted-on directory
dir may be used.
If invoked with either the file system name or the directory
mount point, but not both, mount mount searches /etc/fstab for an
entry whose dir or fsname field matches the given argument. For
example, if /etc/fstab contains:
/dev/dsk/usr /usr dg/ux rw 1 1
for local file systems, and contains
titan:/usr/titan /usr/titan nfs rw,hard 0 0
for NFS file systems,
then
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mount(1m)
mount /usr
and mount /dev/dsk/usr
are shorthand for
mount -t dg/ux -o rw /dev/dsk/usr /usr
MOUNT OPTIONS
-a Attempt to mount all the file systems described in
/etc/fstab. In this case, fsname and dir are taken from
/etc/fstab. If a type is specified, only the file systems
in /etc/fstab with that type will be mounted.
-o The next argument is a string that specifies mount options.
Valid options are: ro, rw, hard, soft. Options are
separated by commas. The options ro and rw stand for read-
only and read-write; rw is the default. Hard and soft
options are used with remote mounts. With a hard remote
mount, mount tries forever if the mountd(1m) server does not
respond. Once the file system is mounted, access requests
will retry forever if the nfsd(1m) server does not respond.
Hard is the default. With a soft remote mount, if the
mountd(1m) server does not respond, mount forks a background
copy to retry forever. Once the soft mount completes,
access requests will fail with [ETIMEDOUT] if the nfsd(1m)
server does not respond.
-r Mount the specified file system read-only. This is a
shorthand for:
mount -o ro fsname dir
Physically write-protected file systems must be mounted
read-only. If they are not mounted read-only, errors will
occur when access times are updated.
-t The next argument is the file system type. The accepted
types are: dg/ux, nfs, and swap; see fstab(4) for a
description of the legal file system types.
-f Fake a new /etc/mnttab entry, but do not actually mount any
file systems.
-p Print the list of mounted file systems in a format suitable
for use in /etc/fstab.
-v Verbose - mount displays a message indicating the file
system being mounted.
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mount(1m)
UMOUNT OPTIONS
-a Attempt to unmount all the file systems currently mounted.
In this case, fsname is taken from /etc/mnttab
-v Verbose - umount displays a message indicating the file
system being unmounted.
EXAMPLES
mount /dev/dsk/usr /usr mount a local disk
mount -at dg/ux mount all dg/ux file systems
mount -t nfs serv:/usr/src /usr/src mount remote file system
mount serv:/usr/src /usr/src same as above
mount -o soft serv:/usr/src /usr/src same as above but soft mount
mount -p > /etc/fstab save current mount state
FILES
/etc/mnttab mount table
/etc/fstab file system table
SEE ALSO
mount(2), nfsmount(2), umount(2), fstab(4), mountd(1m),
mnttab(4), nfsd(1m), fsck(1m), devnm(1m)
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