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devswmgr(8)							  devswmgr(8)



NAME

  devswmgr - utility to	manage the device switch database

SYNOPSIS

  /sbin/devswmgr [-option [parameter]]

OPTIONS

  -display
      Displays the following information about the device switch database:

      Whether a	device switch database was read	from the primary file or from
      a	backup file

      The number of entries that are in	the device switch table

  -getnum [ driver=NAME	] [ instance=INSTANCENUM ]
      Displays the major numbers that have been	reserved by all	drivers, a
      named driver, or an instance of a	named driver.

      A	driver that requires more than one entry in the	device switch table
      uses a unique instance number to reference each of its device switch
      table entries.

  -help
      Displays help for	the devswmgr command.

  -release driver=NAME [ instance=INSTANCENUM ]
      Releases all the major numbers for a device driver if just the driver
      name is specified.  Releases one major number for	a device driver	if
      the NAME and the INSTANCENUM of the driver are specified.

DESCRIPTION

  The devswmgr command helps you manage	the device switch table	by displaying
  information about the	devices	drivers	in the table.

  You can also use the command to release device switch	table entries.	Typi-
  cally, you release the entries for a driver after you	have unloaded the
  driver and do	not plan to reload it later.  Releasing	the entries frees
  them for use by other	device drivers.

EXAMPLES

   1.  The following example shows that	a device switch	table was loaded from
       the primary device and that there are 70	entries	in it:
	    % /sbin/devswmgr -display
	    Device switch information
	      device switch database read from primary file
	      device switch table has 70 entries

   2.  The following example shows the major numbers in	the device switch
       table that have been reserved for the driver named cam_disk:
	    % /sbin/devswmgr -getnum driver=cam_disk

	    Device switch reservation list

						      (*=entry in use)
			driver name		instance   major
	      -------------------------------	--------   -----
				     cam_disk	       1      8*



FILES

  /etc/gen-databases
      The file that manages the	device switch databases

  /etc/dec_devsw_db
      The primary device switch	database file

  /etc/dec_devsw_bak
      The backup device	switch database	file

SEE ALSO

  Commands: hwmgr(8)