Specifications

Accessing Devices on a Standard Mode SCSI Adapter
If you cannot access any device attached to a SCSI adapter card
in Standard Mode, you might have a problem with conflicting
interrupt vectors and start I/O and stop I/O hexadecimal address.
Compare the entries for these values in the /etc/conf/sdevice.d/ad
file with the values displayed by the System Configuration
program to see if the interrupt vector and the start I/O and stop
I/O hexadecimal addresses match. The /etc/conf/sdevice.d/ad file
consists of one or two lines, depending on the number of
SCSI adapters. Here is a sample ad file with one entry:
ad Y 1 5 1 11
330
332 0 0
The sixth field from the left displays the interrupt vector, which is
11 in this example. The seventh and eighth fields display the start
I/O and stop I/O hexadecimal addresses, respectively. In this
sample entry, the start I/O hexadecimal address is 330, and the
stop I/O hexadecimal address is 332.
The last (or only) entry in /etc/conf/sdevice.d/ad is the entry for
the secondary SCSI adapter (if it is in Standard mode). The values
in the interrupt vector and the start and stop I/O hexadecimal
address fields must match the values displayed by the System
Configuration program. If they do not match, use the System
Configuration program to change the values to match those in
/etc/conf/sdevice.d/ad. If these new values conflict with the values
for the primary host adapter, the UNIX SCSI Manager displays a
warning. You must then change the values for the primary host
adapter as well.
Operating Notes
The UNIX SCSI Manager will implement high-performance
support for a broad range of SCSI peripheral devices without
further intervention. However, when you require the highest
performance, you may want to alter some parameters to improve
performance, depending on the system environment and
applications you are using.
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Installing Software Drivers for UNIX