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VN(4) Device Drivers Manual VN(4)

vn — vnode disk driver

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"

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 applications, 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.

/dev/vn*
vn device special files

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

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

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

September 28, 2009 DragonFly-5.6.1