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NetBSD 6.1.5 - man page for vnd (netbsd section 4)

VND(4)				   BSD Kernel Interfaces Manual 			   VND(4)

NAME
     vnd -- vnode disk driver

SYNOPSIS
     pseudo-device vnd
     options VND_COMPRESSION

DESCRIPTION
     The vnd driver provides a disk-like interface to a file.  This is useful for a variety of
     applications, including swap files and building miniroot or floppy disk images.

     This document assumes that you're familiar with how to generate kernels, how to properly
     configure disks and pseudo-devices in a kernel configuration file.

     In order to compile in support for the vnd, you must add a line similar to the following to
     your kernel configuration file:

	   pseudo-device  vnd	    # vnode disk driver

     To also compile in support for reading compressed disk images, add the following option to
     your kernel config file:

	   options	  VND_COMPRESSION    # compressed vnd(4)

     Compressed disk images are expected in the cloop2 format, they can be created from "normal"
     disk images by the vndcompress(1) program.

     There is a run-time utility that is used for configuring both compressed and uncompressed
     vnds.  See vnconfig(8) for more information.

FILES
     /dev/{,r}vnd*  vnd device special files.

SEE ALSO
     config(1), vndcompress(1), MAKEDEV(8), fsck(8), mount(8), newfs(8), vnconfig(8)

HISTORY
     The vnode disk driver was originally written at the University of Utah.  The compression
     handling is based on code by Cliff Wright <cliff@snipe444.org>.

BUGS
     The vnd driver does not work if the file does not reside in a local filesystem.

     The vnd driver does not work if the file is sparse.

BSD					December 18, 2009				      BSD


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