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Quantum DAT 160 Reference Guide

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Installing a DLT, SDLT, VS, LTO, or DAT Tape Drive Into a Linux Operating System
6464215-01, Rev B
January 2006
Obtaining Device Information Using /proc/scsi/scsi
10
Identifying the Tape 
Devices
0
You can identify the tape device by looking at the values listed for “
channel
” 
(PCI Bus), “
id
” (SCSI ID), and “
lun
” (
lun
 is always “
0
” for standalone 
configurations). 
If you have more than one tape device, you should see similar lines of output 
for each device. 
What To Do if Device 
Information is Missing
0
If you do not see the information for every attached tape device, then the 
st
 
driver is not communicating with the missing device(s). Try the following 
solutions:
• Verify that the connector cable length does not exceed the specifications 
listed in your product manual. 
• Make sure the SCSI bus is terminated properly (see your product manual 
for instructions). 
• Ensure there are enough 
st
 tape device nodes for all your attached tape 
devices. If not, you will need to create more. See 
Obtaining Device Information Using /proc/scsi/scsi
0
To obtain information about a specific tape drive, view the 
/proc/scsi/scsi
 file. 
What is the /proc File 
System?
0
The
 /proc
 file system is a map to the running kernel process. It displays a list of 
connected SCSI devices. It is not a disk-based file system and is dynamic to 
reflect the current boot-up information. 
Viewing /proc Files
0
The recommended method to view 
/proc 
files is to use the 
cat
 command piped 
( | ) with command 
more 
or
 less
. Execute the following command: 
# cat /proc/scsi/scsi | less
The output will look something like the following:
Attached devices:
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: QUANTUM  Model: SDLT320          Rev: 5252
  Type:   Sequential-Access                ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 03 Lun: 00
Caution:
Do NOT execute the 
cat
 command on the 
/proc/kcore 
file. This 
unique file contains a running image of the kernel’s memory at 
that particular moment. Executing the 
cat
 command on this 
file will render your terminal unusable.