NAME
glabel — disk labelization control utility
SYNOPSIS
glabel create
[−v] name dev
glabel destroy [−fv] name
[name [...]]
glabel label [−v] name dev
glabel stop [−fv] name
[name [...]]
glabel clear [−v] dev
[dev [...]]
glabel dump dev [dev [...]]
glabel list [prov [...]]
glabel load [−v]
glabel unload [−v]
DESCRIPTION
The glabel utility is used for GEOM providers 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 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 (directory /dev/ufs/).
•
UFS2 (directory /dev/ufs/).
•
MSDOSFS (FAT12, FAT16, FAT32) (directory /dev/msdosfs/).
•
CD ISO9660 (directory /dev/iso9660/).
Non file-system 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 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
List all currently configured devices, or list the given devices.
load
Load geom_label.ko kernel module.
unload
Unload geom_label.ko kernel module.
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, both included. If set to 0 minimal debug information is printed, and if set to 2 the maximum amount of debug information in printed.
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
DIAGNOSTICS
Exit status is 0 on success, and 1 if the command fails.
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 [AT] FreeBSD.org>
BSD July 2, 2004 BSD