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 ... |
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 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⟩