02-11-2010
I will assume a solaris OS.
if you are not using solaris then my answer may be very wrong...
/etc/vfstab is used to describe the file system you expect to use.
in this file you list the mount point and device of each file system.
you also have options for logging,fsck, mount order and auto mount.
if your file system is marked as auto mount then it will all mount at boot time.
/etc/mounttab is a list of what is mounted right now.
this is NOT a file you should be touching.
the OS will keep a list of what is mounted and on which device.
if you tinker with /etc/mounttab then bad things will happen, likely needing a re-boot to fix.
if you have all the file system in /etc/vfstab mounted then /etc/mounttab will look much like /etc/vfstab
hope this helps.
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LEARN ABOUT POSIX
mount_udfs
mount_udfs(1M) System Administration Commands mount_udfs(1M)
NAME
mount_udfs - mount a udfs file system
SYNOPSIS
mount -F udfs [generic_options] [-o specific_options] [-O] special mount_point
mount -F udfs [generic_options] [-o specific_options] [-O] special | mount_point
DESCRIPTION
The mount utility attaches a udfs file system to the file system hierarchy at the mount_point, which is the pathname of a directory. If
mount_point has any contents prior to the mount operation, these are hidden until the file system is unmounted.
If mount is invoked with either special or mount_point as the only arguments, mount searches /etc/vfstab to fill in the missing arguments,
including the specific_options. See mount(1M).
If special and mount_point are specified without any specific_options, the default is rw.
If the directory on which a file system is to be mounted is a symbolic link, the file system is mounted on the directory to which the sym-
bolic link refers, rather than on top of the symbolic link itself.
OPTIONS
See mount(1M) for the list of supported generic_options.
The following options are supported:
-o specific_options Specify udfs file system specific options in a comma-separated list with no intervening spaces. The following spe-
cific_options are available:
m
Mount the file system without making an entry in /etc/mnttab.
remount
Remount the file system as read-write. The option is used in conjunction with the rw option.
A file system mounted read-only can be remounted as read-write. This option fails if the file system is not
currently mounted.
-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 fails,
producing the error device busy.
FILES
/etc/mnttab Table of mounted file systems
/etc/vfstab List of default parameters for each file system
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWudf |
+-----------------------------+-----------------------------+
SEE ALSO
fsck(1M), fsck_udfs(1M), mount(1M), mountall(1M), mount(2), mnttab(4), vfstab(4), attributes(5)
DIAGNOSTICS
not super user
The command is run by a non-root user. Run as root.
no such device
The device name specified does not exist.
not a directory
The specified mount point is not a directory.
is not an udfs file system
The device specified does not contain a udf 1.50 file system or the udfs file system module is not available.
is already mounted
The specified device is already in use.
not a block device
The device specified is not a block device. Use block device to mount.
write-protected
The device is read-only.
is corrupted. needs checking
The file system is in an inconsistent state. Run fsck.
NOTES
Copy-protected files can be stored on DVD-ROM media using Universal Disk Format (UDF). Reading these copy-protected files is not possible
as this involves an authentication process. Unless an authentication process between the host and the drive is completed, reading these
copy-protected files after mounting and before the authentication process, returns an error.
SunOS 5.10 24 Nov 2003 mount_udfs(1M)