glabel(8)

NAME

glabel - disk labelization control utility

SYNOPSIS

glabel create [-v] name dev
glabel destroy [-fv] name ...
glabel label [-v] name dev
glabel stop [-fv] name ...
glabel clear [-v] dev ...
glabel dump dev ...
glabel list
glabel status
glabel load
glabel unload

DESCRIPTION

The glabel utility is used for GEOM provider labelization.

A label can
be set up on a GEOM provider in two ways: ``manual'' or

``automatic''.
When using the ``manual'' method, no metadata are stored on

the devices,
so a label has to be configured by hand every time it is

needed. The
``automatic'' method uses on-disk metadata to store the la

bel and detect
it automatically in the future.

This class also provides volume label detection for file

systems. Those
labels cannot be set with glabel, but must be set with the

appropriate
file system utility, e.g. for UFS the file system label is

set with
tunefs(8). Currently supported file systems are:

+o UFS1 (directory /dev/ufs/).
+o UFS2 (directory /dev/ufs/).
+o MSDOSFS (FAT12, FAT16, FAT32) (directory

/dev/msdosfs/).
+o CD ISO9660 (directory /dev/iso9660/). +o EXT2FS (directory /dev/ext2fs/). +o REISERFS (directory /dev/reiserfs/). +o NTFS (directory /dev/ntfs/).

Non file-system labels are created in the directory

/dev/label/.

The first argument to glabel indicates an action to be per

formed:

create Create temporary label name for the given

provider. This is

the ``manual'' method. The kernel module

geom_label.ko will
be loaded if it is not loaded already.

label Set up a label name for the given provider.

This is the

``automatic'' method, where metadata is stored

in a
provider's last sector. The kernel module

geom_label.ko
will be loaded if it is not loaded already.

stop Turn off the given label by its name. This

command does not

touch on-disk metadata!

destroy Same as stop.

clear Clear metadata on the given devices.

dump Dump metadata stored on the given devices.

list See geom(8).

status See geom(8).

load See geom(8).

unload See geom(8).

Additional options:

-f Force the removal of the specified labels.

-v Be more verbose.

SYSCTL VARIABLES

The following sysctl(8) variables can be used to control the

behavior of
the LABEL GEOM class. The default value is shown next to

each variable.

kern.geom.label.debug: 0

Debug level of the LABEL GEOM class. This can be

set to a number
between 0 and 2 inclusive. If set to 0 minimal de

bug information
is printed, and if set to 2 the maximum amount of

debug information is printed.

EXIT STATUS

Exit status is 0 on success, and 1 if the command fails.

EXAMPLES

The following example shows how to set up a label for disk

``da2'', create a file system on it, and mount it:

glabel label -v usr /dev/da2
newfs /dev/label/usr
mount /dev/label/usr /usr
[...]
umount /usr
glabel stop usr
glabel unload

The next example shows how to set up a label for a UFS file

system:

tunefs -L data /dev/da4s1a
mount /dev/ufs/data /mnt/data

SEE ALSO

geom(4), loader.conf(5), geom(8), mount(8), newfs(8),

sysctl(8),
tunefs(8), umount(8)

HISTORY

The glabel utility appeared in FreeBSD 5.3.

AUTHORS

Pawel Jakub Dawidek <pjd@FreeBSD.org>

BSD July 2, 2004

BSD