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 ... |
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
HISTORY
The
glabel utility appeared in
FreeBSD 5.3.
AUTHORS
Pawel Jakub Dawidek <pjd@FreeBSD.org>