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A monolithic kernel is an operating system architecture where the entire operating system is working in kernel space.
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geom_uzip(4) [freebsd man page]

GEOM_UZIP(4)						   BSD Kernel Interfaces Manual 					      GEOM_UZIP(4)

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): geom_uzip_load="YES" 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 opera- tions 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>. BSD
October 9, 2006 BSD

Check Out this Related Man Page

GEOM_UNCOMPRESS(4)					   BSD Kernel Interfaces Manual 					GEOM_UNCOMPRESS(4)

NAME
geom_uncompress -- GEOM based compressed disk images SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: options GEOM_UNCOMPRESS Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): geom_uncompress_load="YES" DESCRIPTION
The geom_uncompress 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_uncompress to detect compressed images which have been created with mkulzma(8) or mkuzip(8) and presented to the kernel as a logical disk device via md(4). geom_uncompress creates a unique md#.uncompress device for each image. The geom_uncompress device is subsequently used by the FreeBSD kernel to access the disk images. The geom_uncompress driver does not allow write operations to the underlying disk image. To check which md(4) devices match a given geom_uncompress device: # geom uncompress list Geom name: md0.uncompress Providers: 1. Name: md0.uncompress Mediasize: 52428800 (50M) Sectorsize: 512 Mode: r1w0e0 Consumers: 1. Name: md0 Mediasize: 20864000 (20M) Sectorsize: 512 Mode: r1w0e0 SEE ALSO
GEOM(4), md(4), geom(8), mkulzma(8), mkuzip(8) AUTHORS
The geom_uncompress driver was written by Maxim Sobolev <sobomax@FreeBSD.org> and Aleksandr Rybalko <ray@FreeBSD.org>. This manual page was written by Luiz Otavio O Souza <loos@FreeBSD.org>. BSD
January 9, 2014 BSD

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