FreeBSD 7.0 manual page repository

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geom_uzip - GEOM based compressed disk images



      geom_uzip - GEOM based compressed disk images


      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):


      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
            1. Name: md1.uzip
               Mediasize: 22003712 (21M)
               Sectorsize: 512
               Mode: r1w0e1
            1. Name: md1
               Mediasize: 9563648 (9.1M)
               Sectorsize: 512
               Mode: r1w0e1
      GEOM(4), md(4), geom(8), mkuzip(8)


      The geom_uzip driver was written by Max Khon 〈〉.  This
      manual page was written by Ceri Davies 〈〉.


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.