NAME¶
geom_uzip —
GEOM based compressed disk
images
SYNOPSIS¶
To compile this driver into the kernel, place the following line in your kernel
configuration file:
options
GEOM_UZIP
Alternatively, to load the driver as a module at boot time, place the following
line in
loader.conf(5):
DESCRIPTION¶
The
geom_uzip framework provides support for compressed read
only disk images. This allows significant storage savings at the expense of a
little CPU time on each read. Data written in the GEOM label area allows
geom_uzip to detect compressed images which have been
created with
mkuzip(8) and presented to the kernel as a
logical disk device via
md(4).
geom_uzip
creates a unique
md#.uzip device for each image.
The
geom_uzip device is subsequently used by the
FreeBSD kernel to access the disk images. The
geom_uzip driver does not allow write operations to the
underlying disk image. To check which
md(4) devices match a
given
geom_uzip device:
# geom uzip list
Geom name: md1.uzip
Providers:
1. Name: md1.uzip
Mediasize: 22003712 (21M)
Sectorsize: 512
Mode: r1w0e1
Consumers:
1. Name: md1
Mediasize: 9563648 (9.1M)
Sectorsize: 512
Mode: r1w0e1
SEE ALSO¶
GEOM(4),
md(4),
geom(8),
mkuzip(8)
AUTHORS¶
The
geom_uzip driver was written by
Max
Khon ⟨fjoe@FreeBSD.org⟩. This manual page was written by
Ceri Davies ⟨ceri@FreeBSD.org⟩.
