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CHIO(1)			FreeBSD	General	Commands Manual		       CHIO(1)

NAME
     chio -- medium changer control utility

SYNOPSIS
     chio [-f changer] command [-<flags>] arg1 arg2 [arg3 [...]]

DESCRIPTION
     The chio utility is used to control the operation of medium changers,
     such as those found in tape and optical disk jukeboxes.

     The options are as	follows:

     -f	changer
	     Use the device changer rather than	the default device /dev/ch0.

     The default changer may be	overridden by setting the environment variable
     CHANGER to	the desired changer device.

     A medium changer apparatus	is made	up of elements.	 There are five	ele-
     ment types: picker	(medium	transport), slot (storage), portal
     (import/export), drive (data transfer), and voltag	(select	by volume
     identifier).  The voltag pseudo-element type allows the selection of
     tapes by their volume tag (typically a barcode on the tape).

     In	this command description, the shorthand	ET will	be used	to represent
     an	element	type, and EU will be used to represent an element unit.	 For
     example, to represent the first robotic arm in the	changer, the ET	would
     be	``picker'' and the EU would be ``0''.

SUPPORTED COMMANDS
     move _from	ET_ _from EU_ _to ET_ _to EU_ [inv]
	     Move the media unit from _from ET/EU_ to _to ET/EU_.  If the
	     optional modifier inv is specified, the media unit	will be
	     inverted before insertion.

     exchange _src ET_ _src EU_	_dst1 ET_ _dst1	EU_ [_dst2 ET_ _dst2 ET_]
	     [inv1] [inv2]
	     Perform a media unit exchange operation.  The media unit in _src
	     ET/EU_ is moved to	_dst1 ET/EU_ and the media unit	previously in
	     _dst1 ET/EU_ is moved to _dst2 ET/EU_.  In	the case of a simple
	     exchange, _dst2 ET/EU_ is omitted and the values _src ET/EU_ are
	     used in their place.  The optional	modifiers inv1 and inv2	spec-
	     ify whether the media units are to	be inverted before insertion
	     into _dst1	ET/EU_ and _dst2 ET/EU_	respectively.

	     Note that not all medium changers support the exchange operation;
	     the changer must have multiple free pickers or emulate multiple
	     free pickers with transient storage.

     return _from ET_ _from EU_
	     Return the	media unit to its source element.  This	command	will
	     query the status of the specified media unit, and will move it to
	     the element specified in its source attribute.  This is a conve-
	     nient way to return media from a drive or portal to its previous
	     element in	the changer.

     position _to ET_ _to EU_ [inv]
	     Position the picker in front of the element described by _to
	     ET/EU_.  If the optional modifier inv is specified, the media
	     unit will be inverted before insertion.

	     Note that not all changers	behave as expected when	issued this
	     command.

     params  Report the	number of slots, drives, pickers, and portals in the
	     changer, and which	picker unit the	changer	is currently config-
	     ured to use.

     getpicker
	     Report which picker unit the changer is currently configured to
	     use.

     setpicker _unit_
	     Configure the changer to use picker _unit_.

     ielem [_timeout_]
	     Perform an	INITIALIZE ELEMENT STATUS operation on the changer.
	     The optional _timeout_ parameter may be given to specify a	time-
	     out in seconds for	the operations.	 This may be used if the oper-
	     ation takes unusually long	because	of buggy firmware or the like.

     voltag [-fca] _ET_	_EU_ [_label_] [_serial_]
	     Change volume tag for an element in the media changer.  This com-
	     mand is only supported by few media changers.  If it is not sup-
	     ported by a device, using this command will usually result	in an
	     "Invalid Field in CDB" error message on the console.

	     If	the -c flag is specified, the volume tag of the	specified ele-
	     ment is cleared.  If the -f flag is specified, the	volume tag is
	     superseded	with the specified volume tag even if a	volume tag is
	     already defined for the element.  It is an	error to not specify
	     the -f flag when trying to	set a label for	an element which
	     already has volume	tag information	defined.

	     The command works with the	primary	volume tag or, if the -a flag
	     is	given, with the	alternate volume tag.

     status [-vVsSbIa] [_type_]
	     Report the	status of all elements in the changer.	If _type_ is
	     specified,	report the status of all elements of type _type_.

     -v	     Print the primary volume tag for each loaded medium, if any.  The
	     volume tag	is printed as ``<LABEL:SERIAL>''.

     -V	     Print the alternate volume	tag for	each loaded medium, if any.

     -s	     Print the additional sense	code and additional sense code quali-
	     fier for each element.

     -S	     Print the element source address for each element.

     -b	     Print SCSI	bus information	for each element.  Note	that this
	     information is valid only for drives.

     -I	     Print the internal	element	addresses for each element.  The
	     internal element address is not normally used with	this driver.
	     It	is reported for	diagnostic purposes only.

     -a	     Print all additional information (as in -vVsSba).

     The status	bits are defined as follows:

     FULL    Element contains a	media unit.

     IMPEXP  Media was deposited into element by an outside human operator.

     EXCEPT  Element is	in an abnormal state.

     ACCESS  Media in this element is accessible by a picker.

     EXENAB  Element supports passing media (exporting)	to an outside human
	     operator.

     INENAB  Element supports receiving	media (importing) from an outside
	     human operator.

FILES
     /dev/ch0  default changer device

EXAMPLES
     chio move slot 3 drive 0
	     Move the media in slot 3 (fourth slot) to drive 0 (first drive).

     chio move voltag VOLUME01 drive 0
	     Move the media with the barcode VOLUME01 to drive 0 (first
	     drive).

     chio return drive 0
	     Remove the	tape from drive	0 (first drive)	and return it to its
	     original location in the rack.

     chio setpicker 2
	     Configure the changer to use picker 2 (third picker) for opera-
	     tions.

SEE ALSO
     mt(1), mount(8)

AUTHORS
     The chio program and SCSI changer driver were written by Jason R. Thorpe
     <thorpej@and.com> for And Communications, http://www.and.com/.

     Additional	work by	Hans Huebner <hans@artcom.de> and Steve	Gunn
     <csg@waterspout.com>.

FreeBSD	9.2			 May 14, 1998			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | SUPPORTED COMMANDS | FILES | EXAMPLES | SEE ALSO | AUTHORS

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