NAME
chio —
medium changer control
utility
SYNOPSIS
chio |
[-f
changer] command
arg1 arg2
[arg3
[...]] |
DESCRIPTION
chio 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.
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”.
SUPPORTED COMMANDS
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
insertion.
chio exchange <src ET>
<src EU> <dst1 ET> <dst1 EU>
[
<dst2 ET> <dst2
ET>] [
inv1]
[
inv2]
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 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.
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 before insertion.
Note that not all changers behave as expected when issued this command.
chio params
Report the number of slots, drives, pickers, and portals in the changer, and
which picker unit the changer is currently configured to use.
chio getpicker
Report which picker unit the changer is currently configured to use.
chio setpicker
<unit>
Configure the changer to use picker
<unit>.
chio status
[
<type> [unit
[count]]]
[
voltags]
Report the status of all elements in the changer. If
<type> is specified, 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 operator.
-
-
- INENAB
- Element supports receiving media (importing) from an
outside human operator.
If the element is a drive, the device name of the drive will be reported if it
is available.
If the [
voltags] option is
specified, primary and alternate volume tag information will be reported, if
available.
If the previous location of the media is available, it will also be reported.
chio ielem
Perform an
INITIALIZE ELEMENT STATUS operation on the changer.
chio cdlu
<sub-command> <slot>
This command is provided for controlling CD-ROM changer mechanisms which cannot
use the standard changer control interface. ATAPI CD-ROM changers fall into
this category. There are 3 sub-commands:
-
-
- load
- Loads the media from the specified slot into the CD-ROM
drive.
-
-
- unload
- Unloads the media from the CD-ROM drive and returns it to
the specified slot.
-
-
- abort
- Aborts any pending load or unload operation.
ENVIRONMENT
-
-
CHANGER
- The default changer may be overridden by setting this
environmental variable to the desired changer device.
FILES
/dev/ch0 - default changer device
EXAMPLES
chio -f /dev/ch0 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.
chio -f /dev/cd0a cdlu load 1
Loads the media from slot (second slot) into the CD-ROM drive.
chio -f /dev/ch1 status
Returns status of all elements in the second changer.
SEE ALSO
mt(1),
mount(8)
HISTORY
A
chio utility appeared in
NetBSD 1.3.
AUTHORS
The
chio program and SCSI changer driver were originally
written by
Jason R. Thorpe for
And Communications. Additional
development was done by
Jason R. Thorpe for the
Numerical Aerospace Simulation Facility, NASA Ames Research Center.