changers(8)
changers(8)
NAME
changers - list SCSI autochangers attached to the system
SYNOPSIS
changers [ -dpv ] [ -a b.t.l | -f filename ] [ -l ]
DESCRIPTION
The changers program lists all of the SCSI autochangers (jukeboxes)
connected to the current system.
OPTIONS
-a b.t.l
Selects a specific ordinal SCSI address, where b is the logical
SCSI bus, t is the SCSI target, and l is the SCSI logical unit
number (LUN) on that target. See libscsi(8).
-f filename
Specifies an explicit device file name for changers to use on
platforms that support direct use of device file names
for jukeboxes.
At this time those platforms are Solaris 10+, AIX and Linux.
-d Determines the names and addresses of the autochanger's media
elements (for example, tape drives).
-l Performs a complete LUN search for all SCSI adapters in the sys-
tem. This argument is accepted on all systems, but does not
have any effect on HP-UX systems. Due to the method used to
scan for available devices on HP-UX systems, all accessible
devices are always shown, and the -l option has no additional
effect. On all other platforms, the normal behavior is to start
checking at LUN 0 for SCSI devices. The first empty LUN found
will end the search for a given target ID. With the -l option,
all LUN present on all target IDs for all SCSI busses in the
system will be checked for devices. This can take a very long
time and should therefore only be used when necessary. For
example, a Fibre Channel adapter can support 126 target IDs,
each of which may have 80 or more LUNs. Checking all LUNs on
this single adapter may take over 10 minutes.
-p Tells changers to use persistent device names for jukeboxes on
platforms where persistent names are supported. Currently only
linux has such support.
-v Lists more detailed information about each autochanger. The
details indicate how many media transports (MT, for example,
robot arm), storage transports (ST, for example, slot),
import/export elements (IE, for example, mail slot), and data
transport (DT) elements the autochanger contains. The -v option
also provides information about the element movement matrix sup-
ported by the autochanger.
EXAMPLE
Sample output is shown below: hal$ changers -dv -a 0.2.0
scsidev@0.2.0:Vendor <SPECTRA>, Product <4000>
Data Transfer Element at address 80 is scsidev@0.5.0
Device:Vendor <HP>, Product <C1533A>
Type:Tape
System Name: /dev/rmt2.1
Data Transfer Element at address 81 is scsidev@0.6.0
Device:Vendor <HP>, Product <C1533A>
Type:Tape
System Name: /dev/rmt3.1
1 MT Element starting at address 79
60 ST Elements starting at address 1
1 IE Element starting at address 0
2 DT Elements starting at address 80
Element Movement Matrix
->DT, ->IE, ->ST, ->MT
MT->DT,MT->IE,MT->ST,______
ST->DT,ST->IE,ST->ST,ST->MT
IE->DT,______,IE->ST,IE->MT
DT->DT,DT->IE,DT->ST,DT->MT
______,______,______,______
______,______,______,______
______,______,______,______
______,______,______,______
SEE ALSO
libscsi(8)
NetWorker 7.6.2 Jul 14, 11 changers(8)