CHIO(1) OpenBSD Reference Manual CHIO(1)NAMEchio - medium changer control utility
SYNOPSISchio [-f changer] command [arg ...]
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.
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:
exchange src-ET src-EU dst1-ET dst1-EU [dst2-ET dst2-EU] [inv1] [inv2]
Performs a media unit exchange operation. The media unit in
src-ET/src-EU is moved to dst1-ET/dst1-EU and the media unit
previously in dst1-ET/dst1-EU is moved to dst2-ET/dst2-EU. In
the case of a simple exchange, dst2-ET/dst2-EU is omitted and the
values src-ET/src-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/dst2-EU and
dst2-ET/dst2-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.
getpicker
Report which picker unit the changer is currently configured to
use.
move from-ET from-EU to-ET to-EU [inv]
Moves the media unit from from-ET/from-EU to to-ET/to-EU. 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/rstX 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.
position to-ET to-EU [inv]
Position the picker in front of the element described by
to-ET/to-EU. 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.
setpicker unit
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 ``<LABEL:SERIAL>''.
-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
SEE ALSOmt(1), ch(4), st(4), chio.conf(5)AUTHORS
The chio program and SCSI changer driver were written by Jason R. Thorpe
<thorpej@and.com> for And Communications (http://www.and.com/).
OpenBSD 4.9 November 2, 2007 OpenBSD 4.9
