24 Installation
Cho osing a SCSI ID
If you are using the standard software as supplied by Solbourne, then SCSI ID's 4
and 5 are reserved for tape drives, or devices suchasthe
DAT-Link
. If you already
have a tape drive connected to your machine, check its SCSI ID setting which should
be either 4 or 5. You can then use the other number for the
DAT-Link
. If both
ID's are already b eing used, or if you wish to install multiple
DAT-Link
devices,
then a custom
UNIX
kernel must be built for the machine | a job for a system
administrator. Arbitrary SCSI ID's can then b e chosen in the range 0 to 6.
5
Connecting the
DAT-Link
The next step is to connect the
DAT-Link
to the computer. Since it is necessary to
unterminate the SCSI bus temp orarily, it is recommended that you shut-down and
turn o the computer before making the connection.
Make sure the
Options
switches on the rear of the
DAT-Link
are set with switch1
up and all the other switches down. Then connect the
DAT-Link
to the computer
using the SCSI cable. If the
DAT-Link
is the last device on the SCSI bus, be sure
to connect the provided SCSI terminator between the cable and the
DAT-Link
's
SCSI connector.
Once it is hooked up and powered on you can rebo ot the computer. If you have
trouble rebooting, verify that the SCSI ID selected on the
DAT-Link
was not one
that was in use. Finally,power on the
DAT-Link
.
Conguring the Device Drivers
Next, you need to create a device in the
/dev
directory called
datlink0
. It should
be a character device with the ma jor and minor device numbers corresponding to
a standard 1/4 inch tape drive at the SCSI address selected on the
DAT-Link
. If,
for example, the
DAT-Link
is set for SCSI ID 5, the device can be created with the
commands:
/etc/mknod /dev/datlink0 c 18 5
chmod 666 /dev/datlink0
For SCSI ID 4, the equivalent commands are:
/etc/mknod /dev/datlink0 c 18 4
chmod 666 /dev/datlink0
5
The
DAT-Link
's SCSI ID switch go es up to 9, but the 8 and 9 settings are only for factory
testing. The Solb ourne itself uses SCSI ID 7
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