12 Installation
Make sure the
Options
switches on the rear of the
DAT-Link
are set with all 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. Note that you may, during bo ot-up, encounter a message similar
to:
st1: warning, unknown tape drive found
This can b e safely ignored.
Conguring the Device Drivers - SunOS 4.1.x
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
Note that you will need to be logged in as
root
to execute the above commands.
For more complex congurations where other SCSI ID's are used consult the section
below regarding SUN's device numb er methods for SCSI tape drives. You can now
proceed with the software installation in Section 2.6 below.
Device Driver Numb ering - SunOS 4.1.x
SUN's minor device naming ab ovemay seem to imply that the minor device corre-
sponds to the SCSI ID. In general, this is not the case. For example, on a typical
Sun 4/470 kernel, tap e devices are congured in the kernel such that the following
bo ot-time messages are generated:
si0 at vme24d16 0x200000 vec 0x40
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