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VN(4)                 DragonFly 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.

DragonFly 3.5                 September 28, 2009                 DragonFly 3.5

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