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.
A medium changer apparatus is made up of
elements.
There are five element 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 code,
which is 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”.
The following commands are supported:
-exchangesrc-ETsrc-EU dst1-ET dst1-EU
[dst2-ETdst2-EU]
[-inv1]
[-inv2]
Performs a media unit exchange operation.
The media unit in
src-ET
is moved to
dst1-ET
and the media unit previously in
dst1-ET
is moved to
dst2-ET.
In the case of a simple exchange,
dst2-ET
is omitted and the values
src-ET
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
and
dst2-ET
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.
-getpicker
Report which picker unit the changer is currently configured to use.
-movefrom-ETfrom-EU to-ET to-EU
[-inv]
Moves the media unit from
from-ET
to
to-ET.
If the optional modifier
-inv
is specified, the media unit will be inverted before insertion.
If
from-ET
is a drive,
chio
will first attempt to open and perform an
MTOFFL
operation on the
st(4)
device corresponding to
from-EU.
By default, the
st(4)
device
/dev/rst
is used, where
X
is the
from-EU.
This mapping can be changed by using the
chio.conf(5)
file.
-params
Report the number of slots, drives, pickers, and portals in the changer,
and which picker unit the changer is currently configured to use.
-positionto-ETto-EU [-inv]
Position the picker in front of the element described by
to-ET.
If the optional modifier
-inv
is specified, the media unit will be inverted before insertion.
Note that not all changers behave as expected in response to this command.
-setpickerunit
Configure the changer to use picker
unit.
-status
[-vVa]
[ET]
Report the status of all elements in the changer.
If
ET
is specified, report the status of all elements of type
ET.
-v
Print the primary volume tag for each loaded medium, if any.
The volume
tag is printed as
“\*(LtLABEL:SERIAL\*(Gt”.
-V
Print the alternate volume tag for each loaded medium, if any.
-a
Print all additional information (as in
-vV).
The status bits output 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.
ENVIRONMENT
CHANGER
The default changer may be overridden by setting this environmental
variable to the desired changer device.
FILES
/dev/ch0
Default changer device.
/etc/chio.conf
Optional configuration file to set up a non-default mapping between
st(4)
devices and changer drives.
EXAMPLES
Move the media in slot 3 (fourth slot) to drive 0 (first drive):
# chio move slot 3 drive 0
Move the media with volume tag 000007L2 to drive 1 (second drive):
# chio move voltag 00007L2 drive 1
Configure the changer to use picker 2 (third picker) for operations:
# chio setpicker 2