FreeBSD 7.0 manual page repository

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geom_uzip - GEOM based compressed disk images

 

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 lit‐
      tle 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
      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〉.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.