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EN JA
GLABEL(8)
GLABEL(8) FreeBSD System Manager's Manual 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 label and detect it automatically in the future.

This GEOM 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:

  • UFS1 volume names (directory /dev/ufs/).
  • UFS2 volume names (directory /dev/ufs/).
  • UFS1 file system IDs (directory /dev/ufsid/).
  • UFS2 file system IDs (directory /dev/ufsid/).
  • MSDOSFS (FAT12, FAT16, FAT32) (directory /dev/msdosfs/).
  • CD ISO9660 (directory /dev/iso9660/).
  • EXT2FS (directory /dev/ext2fs/).
  • REISERFS (directory /dev/reiserfs/).
  • NTFS (directory /dev/ntfs/).

Support for partition metadata is implemented for:

  • GPT labels (directory /dev/gpt/).
  • GPT UUIDs (directory /dev/gptid/).

Generic labels are created in the directory /dev/label/.

The first argument to glabel indicates an action to be performed:

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 debug 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>
April 22, 2013 FreeBSD