table of contents
GLABEL(8) | 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:
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 | Debian |