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CHIO(1) OpenBSD Reference Manual CHIO(1)
chio - medium changer control utility
chio [-f changer] command arg1 arg2 [arg3 [...]]
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:
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 four element
types: picker (medium transport), slot (storage), portal (import/export),
and drive (data transfer). 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''.
chio move <from ET> <from EU> <to ET> <to EU> [inv]
Moves 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 inser-
chio exchange <src ET> <src EU> <dst1 ET> <dst1 EU> [<dst2 ET> <dst2 EU>]
Performs 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 specify whether the media units are to be invert-
ed 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.
chio 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
Note that not all changers behave as expected when issued this command.
Report the number of slots, drives, pickers, and portals in the changer,
and which picker unit the changer is currently configured to use.
Report which picker unit the changer is currently configured to use.
chio setpicker <unit>
Configure the changer to use picker <unit>.
chio status [<type>]
Report the status of all elements in the changer. If <type> is speci-
fied, report the status of all elements of type <type>.
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
INENAB Element supports receiving media (importing) from an outside hu-
chio move slot 3 drive 0
Moves the media in slot 3 (fourth slot) to drive 0 (first drive).
chio setpicker 2
Configures the changer to use picker 2 (third picker) for operations.
/dev/ch0 default changer device
mt(1), ch(4), mount(8)
The chio program and SCSI changer driver were written by Jason R. Thorpe
<email@example.com> for And Communications (http://www.and.com/).
OpenBSD 2.6 April 2, 1996 2
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for chio(1)
OpenBSD sources for chio(1)
Up to: File System Information - Obtaining information of the filesystem as a whole. Status of disk subsystems, capacity, etc.
Up to: Hardware Access
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