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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 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⟩.



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