GLABEL(8) MidnightBSD System Manager’s Manual GLABEL(8)
glabel — disk labelization control utility
glabel create [−v]
glabel destroy [−fv] name ...
glabel label [−v] name dev
glabel stop [−fv] name ...
glabel clear [−v] dev ...
glabel dump dev ...
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 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/).
EXT2FS (directory /dev/ext2fs/).
REISERFS (directory /dev/reiserfs/).
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 performed:
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.
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.
Turn off the given label by its name. This command does not touch on-disk metadata!
Same as stop.
Clear metadata on the given devices.
Dump metadata stored on the given devices.
Force the removal of the specified labels.
Be more verbose.
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.
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 is 0 on success, and 1 if the command fails.
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
mount /dev/label/usr /usr
glabel stop usr
The next example shows how to set up a label for a UFS file system:
tunefs -L data
mount /dev/ufs/data /mnt/data
geom(4), loader.conf(5), geom(8), mount(8), newfs(8), sysctl(8), tunefs(8), umount(8)
The glabel utility appeared in FreeBSD 5.3.
Pawel Jakub Dawidek 〈pjd@FreeBSD.org〉
MidnightBSD 0.3 July 2, 2004 MidnightBSD 0.3