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Determining Linux SCSI Parameters C-1
C
Determining Linux SCSI Parameters
For the Linux and UNIX platforms, if you do not know the SCSI parameters of a tape
device , then you must determine them before you begin installation. This appendix
describes procedures for determining SCSI device parameters on Linux and UNIX.
Determining SCSI Device Parameters on Linux
To obtain tape device information on Linux, use the
cat
command to view the
contents of
/proc/scsi/scsi
. For example:
# cat /proc/scsi/scsi
Example C–1 shows sample output for a host called
storabck05
with two attached
tape devices.
Example C–1 Sample /proc/scsi/scsi Contents
Attached devices:
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: IBM Model: ULTRIUM-TD2 Rev: 4772
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: ADIC Model: Scalar 24 Rev: 237A
Type: Medium Changer ANSI SCSI revision: 02
A device of type
Sequential-Access
, such as the first tape device in the list, is a
tape drive . A device of type
Medium Changer
, such as the second tape device, is a
tape library .
For each tape device, the information needed is found in the line that reads:
Host: scsi0 Channel: 00 Id: 02 Lun: 00
The output can be interpreted as follows:
■
The host bus adapter number is the numeric part of the value
scsi n
. For example,
for both tape devices in this output the host bus adapter number is
0
.
■
The value for
Channel
is the SCSI bus address. For example, in this output the
SCSI bus address is
0
.
■
The value for
Id
is the target ID. For example, in this output the ID of the tape
drive is
2
, and the ID of the tape library is
4
.
See Also: "Identifying and Configuring Linux Attach Points" on
page 2-18 for information about configuring attach points for Linux