Information Technology Reference
In-Depth Information
Mounting and Unmounting File Systems
File systems are made accessible using the
mount(1M)
command. This com-
mand associates the file system with a subdirectory (called the
mount point
) of
a currently mounted file system.
The
mount
command is typically called with two command-line arguments:
a logical block device name (partition) associated with a file system and a
mount point where the file system should be mounted. In addition, the
-F
command-line can be specified to identify the type of file system being
mounted. Mounted file systems are listed in the
/etc/mnttab
file (unless the
-m
command-line argument is specified). If the
mount
command is used with
no command-line arguments, all mounted file systems listed in the
/etc/mnttab
file are displayed.
The
mount
command supports several options specified as command-line
arguments. One significant option is UFS large file support. By default, UFS
file systems support large files (greater than 2GB). This is the same as
specifying
-o largefiles
as a command-line argument. To disable large file
support, specify
-o nolargefiles
as a command-line argument to the
mount
command. If this option is specified and a large file exists on the file system,
the mount will fail.
Table 7.6 lists the commonly used command-line arguments for the
mount
command.
Table 7.6
Selected mount Command-Line Arguments
Argument
Use
-F
type
Specify the type of file system (NFS, UFS, and so on)
-m
Mount file system without making entry in
/etc/mnttab
.
-o
Specify file system-specific options.
-p
List mounted file systems (abbreviated listing).
-r
Mount the file system read-only.
-v
List mounted file system (verbose listing).
Multiple file system-specific options (
-o
) can be specified separated by com-
mas. Some of the frequently used UFS options are:
atime
—Use normal access time recording (default).
➤
intr
—Allow keyboard interrupts to kill processes waiting on file system
I/O (default).
➤
largefiles
—Allow files larger than 2GB (default).
➤
