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vnconfig(8) [netbsd man page]

VNCONFIG(8)						    BSD System Manager's Manual 					       VNCONFIG(8)

NAME
vnconfig -- configure vnode disks SYNOPSIS
vnconfig [-crvz] [-f disktab] [-t typename] vnode_disk regular_file [geomspec] vnconfig -u [-Fv] vnode_disk vnconfig -l [vnode_disk] DESCRIPTION
The vnconfig 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 con- tain 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/ncylinders If 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 an even multiple of 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. -l List the vnd devices and indicate which ones are in use. If a specific vnode_disk is given, then only that will be described. -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. -r Configure the device as read-only. -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 is given, -c is assumed. FILES
/dev/rvnd?? /dev/vnd?? /etc/disktab EXAMPLES
vnconfig vnd0 /tmp/diskimage or vnconfig /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. vnconfig 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. vnconfig -t floppy vnd0 /tmp/floppy.img Configures the vnode disk vnd0 using the geometry specified in the floppy entry in /etc/disktab. vnconfig -u vnd0 Unconfigures the vnd0 device. SEE ALSO
opendisk(3), vnd(4), mount(8), swapctl(8), umount(8) HISTORY
The vnconfig command appeared in NetBSD 1.0. BUGS
This command should really be named vndconfig. BSD
July 16, 2005 BSD

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DISKTAB(5)						      BSD File Formats Manual							DISKTAB(5)

NAME
disktab -- disk description file SYNOPSIS
#include <disktab.h> DESCRIPTION
disktab is a simple database which describes disk geometries and disk partition characteristics. It is used to initialize the disk label on the disk. The format is patterned after the termcap(5) terminal data base. Entries in disktab consist of a number of `:' separated fields. The first entry for each disk gives the names which are known for the disk, separated by `|' characters. The last name given should be a long name fully identifying the disk. The following list indicates the normal values stored for each disk entry. Name Type Description ty str Type of disk (e.g. removable, winchester) dt str Type of controller (e.g. SMD, ESDI, floppy) ns num Number of sectors per track nt num Number of tracks per cylinder nc num Total number of cylinders on the disk sc num Number of sectors per cylinder, ns*nt default su num Number of sectors per unit, sc*nc default se num Sector size in bytes, DEV_BSIZE default sf bool Controller supports bad144-style bad sector forwarding rm num Rotation speed, rpm, 3600 default sk num Sector skew per track, default 0 cs num Sector skew per cylinder, default 0 hs num Headswitch time, usec, default 0 ts num One-cylinder seek time, usec, default 0 il num Sector interleave (n:1), 1 default d[0-4] num Drive-type-dependent parameters bs num Boot block size, default BBSIZE sb num Superblock size, default SBSIZE ba num Block size for partition `a' (bytes) bd num Block size for partition `d' (bytes) be num Block size for partition `e' (bytes) bf num Block size for partition `f' (bytes) bg num Block size for partition `g' (bytes) bh num Block size for partition `h' (bytes) fa num Fragment size for partition `a' (bytes) fd num Fragment size for partition `d' (bytes) fe num Fragment size for partition `e' (bytes) ff num Fragment size for partition `f' (bytes) fg num Fragment size for partition `g' (bytes) fh num Fragment size for partition `h' (bytes) oa num Offset of partition `a' in sectors ob num Offset of partition `b' in sectors oc num Offset of partition `c' in sectors od num Offset of partition `d' in sectors oe num Offset of partition `e' in sectors of num Offset of partition `f' in sectors og num Offset of partition `g' in sectors oh num Offset of partition `h' in sectors pa num Size of partition `a' in sectors pb num Size of partition `b' in sectors pc num Size of partition `c' in sectors pd num Size of partition `d' in sectors pe num Size of partition `e' in sectors pf num Size of partition `f' in sectors pg num Size of partition `g' in sectors ph num Size of partition `h' in sectors ta str Partition type of partition `a' (4.2BSD filesystem, swap, etc) tb str Partition type of partition `b' tc str Partition type of partition `c' td str Partition type of partition `d' te str Partition type of partition `e' tf str Partition type of partition `f' tg str Partition type of partition `g' th str Partition type of partition `h' FILES
/etc/disktab SEE ALSO
getdiskbyname(3), disklabel(5), disklabel(8), newfs(8) HISTORY
The disktab description file appeared in 4.2BSD. BSD
June 5, 1993 BSD
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