MOUNT(1M) SysV MOUNT(1M)
NAME
mount, umount - mount and unmount file system
SYNOPSIS
Removable file systems only:
/etc/mount [-r] [-f type] [dev dir]
/etc/umount [dev]
Remote file systems only:
/etc/mount [-r] [-f nfs] [,options] [fsys] [dir]
/etc/umount [-root] [fsys | dir]
DESCRIPTION
The mount command mounts removable and remote file systems.
The umount command unmounts removable and remote file systems.
When mounting a removable file system located on a diskette, cartridge
tape, or magtape, specify the device name for dev and a pre-existing
directory pathname for dir.
When mounting a remote file system (that is, one located on another
host), specify the -f option with the argument nfs, the remote host and
file system in the form host:fsname for fsys, and a non-existent
directory for dir if it is a single level mount. (The mount command
creates a gateway object named dir.) Use an existing directory for dir
if the file system is to be mounted hierarchically.
Note: You must have the nfs optional product installed to mount remote
file systems.
The mount and umount commands maintain a table of mounted file systems in
/etc/mnttab. If you execute the mount command without arguments, it
prints the table. If you specify only one argument, the command searches
/etc/fstab for an entry with the same argument; if the entry exists, the
command then uses it to mount the file system.
You must be running as root (the super-user) in order to use the
mount/umount commands.
OPTIONS
The command options can be one or more of the following items separated
by a space.
-f type Accept the argument that follows as the file system type to be
mounted. If this argument is omitted, mount defaults to the
root type.
Type cdfs specifies a CDROM device. To specify the CDROM
volume descriptor, use cdfs,n, where n is the volume descriptor
number. The default for n is 0, which specifies the primary
volume descriptor.
If the type is nfs, then accept the following arguments,
separated by commas, as options. The defaults are fg, retry=1,
timeo=3, and hard.
bg Retry in background if server host's mountd(1m)
doesn't respond.
fg Retry in foreground.
hard Retransmit until server responds.
mtimeo=n Set the mount timeout to n tenths of a second.
port=n Set NFS port number n.
retrans=n Set the number of NFS transmission retries (that
is, the number of attempts NFS will make to access
the mounted file system) to n. There is no ceiling
on the number. When used with the soft option, the
default is 4.
retry=n Set the number of mount retries to n.
ro Allow read only.
root Mount in the global root directory.
rsize=n Set the read request buffer size to n bytes.
rw Allow read/write.
soft Report an error if server fails to respond.
timeo=n Set the NFS transmission timeout to n tenths of a
second. When attempting to access the mounted file
system, NFS waits the specified amount of time for
response; if there is no response, NFS multiplies n
by 2 and retransmits the request. There is a 60
second ceiling on the timeout.
wsize=n Set the write request buffer size to n bytes.
-r Mount the file system as read-only.
-root Unmount the file system in the global root directory.
FILES
/etc/mnttab mount table
/etc/fstab file system table
BUGS
Note that physically write-protected file systems, as well as those on
magnetic tape, must be mounted read-only. If not, errors develop even if
no explicit write is attempted.
Mounting a removable file system containing unreadable or otherwise
invalid data can have unpredictable consequences.
SEE ALSO
fstab(4), mount(2), mnttab(4), mkdisk(1m)