vn man page on DragonFly

vn man page on DragonFly

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VN(4)			 BSD Kernel Interfaces Manual			 VN(4)

NAME
     vn — vnode disk driver

SYNOPSIS
     pseudo-device vn [n]

     Alternatively, to load the driver as a module at boot time, place the
     following line in /boot/loader.conf:

	   vn_load="YES"

DESCRIPTION
     The vn driver uses swap or a file as backing store to abstract-out a
     device which may then be used like a disk.	 The vn driver supports both
     labeled and unlabeled pseudo-disks and is useful for a variety of appli‐
     cations, including swap files and building mini-root, floppy, or CD-ROM
     disk images.  vn may also be used to create temporary swap-backed
     filesystems, such as /tmp, in a somewhat less memory-hungry manner than
     MFS.

     The vn driver supports autocloning. By default 4 vn devices are also
     precreated.

FILES
     /dev/vn*	  vn device special files

SEE ALSO
     fsck(8), mount(8), mount_mfs(8), newfs(8), vnconfig(8)

HISTORY
     The vnode disk driver was originally written at the University of Utah
     and was substantially modified by FreeBSD developers to add swap-backed
     support.

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

BSD			      September 28, 2009			   BSD

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