| CHIO(1) | General Commands Manual | CHIO(1) |
chio —
chio |
[-f changer]
command arg1
arg2 [arg3 [...]] |
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
changerA 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 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:
FULLIMPEXPEXCEPTACCESSEXENABINENABIf 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:
loadunloadabortCHANGERchio -f /dev/ch0 move slot 3 drive
0Moves the media in slot 3 (fourth slot) to drive 0 (first drive).
chio setpicker 2Configures the changer to use picker 2 (third picker) for operations.
chio -f /dev/cd0a cdlu load
1Loads the media from slot (second slot) into the CD-ROM drive.
chio -f /dev/ch1 statusReturns status of all elements in the second changer.
chio utility appeared in NetBSD
1.3.
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.
| August 25, 2016 | NetBSD 9.0 |