NAME
vndconfig
—
configure vnode disks
SYNOPSIS
vndconfig |
[-cirvz ] [-f
disktab] [-t
typename] vnode_disk
regular_file [geomspec] |
vndconfig |
-u [-Fv ]
vnode_disk |
vndconfig |
-l [-m
min] [vnode_disk ...] |
DESCRIPTION
Thevndconfig
command configures vnode pseudo disk
devices. It will associate the vnode disk vnode_disk
with the regular file regular_file allowing the latter
to be accessed as though it were a disk. Hence a regular file within the
filesystem can be used for swapping or can contain a filesystem that is
mounted in the name space. The vnode_disk is a special
file of raw partition or name of vnode disk like vnd0.
Options indicate an action to be performed:
-c
- Configures the device. If successful, references to
vnode_disk will access the contents of
regular_file.
If geomspec is specified, the vnode device will emulate the specified disk geometry. The format of the geomspec argument is:
secsize/
nsectors/
ntracks/
ncylindersIf geometry is not specified, the kernel will choose a default based on 1MB cylinders. secsize is the number of bytes per sector. It must be a power of two, and at least 512. nsectors is the number of sectors per track. ntracks is the number of tracks per cylinder. ncylinders is the number of cylinders in the device.
-F
- Force unconfiguration if the device is in use. Does not imply
-u
. -f
disktab- Specifies that the
-t
option should look up in disktab instead of in /etc/disktab. -i
- Configure the device to use regular file I/O even when direct I/O using bmap/strategy would be possible.
-l
- List the vnd devices and indicate which ones are in use. If one or more specific vnode_disks are given, then only those will be described.
-m
min- Together with
-l
and if no specific devices are given, causes at least min devices to be listed. The default for min is 4, but all vnd devices up to (and sometimes just beyond) the highest numbered vnd device configured since the system last booted will be listed. If min is set to 0, then only vnd devices currently in use will be shown. -r
- Configure the device as read-only.
-t
typename- If configuring the device, look up typename in /etc/disktab and use the geometry specified in the entry. This option and the geomspec argument are mutually exclusive.
-u
- Unconfigures the device.
-v
- Print messages to stdout describing actions taken.
-z
- Assume that regular_file is a compressed disk image in cloop2 format, and configure it read-only. See the vndcompress(1) manpage on how to create such an image.
If no action option [-clu
] is given,
-c
is assumed.
FILES
- /dev/rvnd??
- /dev/vnd??
- /etc/disktab
EXIT STATUS
vndconfig
will exit with status 0 if the
operation requested completed successfully, or 1 otherwise. Unsuccessful
completion can be caused by unknown or incorrectly used options; attempting
to configure a vnd that is already configured; or unconfigure one that is
not, or without -F
, one which is still in use; or if
devices are specified that do not exist or are not
vnd(4) devices, giving an improper geometry, etc.
EXAMPLES
vndconfig vnd0
/tmp/diskimage
or
vndconfig /dev/rvnd0c
/tmp/diskimage
Configures the vnode disk vnd0. Please note that use of the second form of the command is discouraged because it requires knowledge of the raw partition which varies between architectures. For the first form, be aware that there must not be a file vnd0 in the current directory, or it will be assumed to be the vnd device to be configured (which will usually fail.)
vndconfig vnd0 /tmp/floppy.img
512/18/2/80
Configures the vnode disk vnd0 emulating the geometry of 512 bytes per sector, 18 sectors per track, 2 tracks per cylinder, and 80 cylinders total.
vndconfig -t floppy vnd0
/tmp/floppy.img
Configures the vnode disk vnd0 using the geometry specified in the floppy entry in /etc/disktab.
vndconfig -u vnd0
Unconfigures the vnd0 device.
To obtain status on all vnd devices listed in
/dev (assuming a system where the ‘d’
partition is the whole device (RAW_PART
)), use:
vndconfig -l /dev/vnd*d
Using
vndconfig -m0 -l
/dev/vnd*d
vndconfig -l
-m
) regardless of what might appear in
/dev (or elsewhere.)
SEE ALSO
vndcompress(1), opendisk(3), vnd(4), mount(8), swapctl(8), umount(8)
HISTORY
The vnconfig
command appeared in
NetBSD 1.0. It was renamed to
vndconfig
in NetBSD 7.0 for
consistency with other similar commands. (The original name was also
retained as an alternative for backwards compatibility.)