User Guide

6-11
SCO UNIX Installation
page 6-2), or update SCO UNIX with the new driver (see Installing
the Driver When SCO UNIX is Already Installed on page 6-5).
Using Wide SCSI Host Adapters and Devices
SCO UNIX 3.2v4.2, SCO ODT 3.0, and SCO OpenServer 3.0 support
SCSI IDs 0 to 7; SCSI IDs greater than 7 are not recognized. If your
7800 Family host adapter is a Wide SCSI adapter, only 7 SCSI
devices (SCSI ID 0 to 6, with the host adapter set at SCSI ID 7) can be
attached and supported.
SCO OpenServer 5 supports SCSI IDs 0 to 15. If your 7800 Family
host adapter is a Wide SCSI adapter, up to 15 SCSI devices can be
attached and supported.
Using Tunable Parameters for the alad Driver
For SCO UNIX, some parameters are defined in the following file:
/etc/conf/pack.d/alad/space.c
These parameters can be tuned for the
alad / alad325 driver. After
modifying the
space.c file, you must rebuild the kernel for the new
parameters to take effect. The following section describes how to set
the tunable parameters.
Setting Parameters
If the space.c file has not been modified, all the parameters are set
according to the SCSISelect utility for your 7800 Family host adapter.
However, you can override the parameters by modifying the
space.c file. Changing the parameters is self-explanatory in the
space.c file. Examples are provided in the following sections.
If you want to change the configured values, the first number
indicates whether the default should be changed. If it is set to 0
(zero), the parameter is set to the default. If it is set to 1, the second
number is used to override the default. For example:
char variable = {1,22};
The first number is 1 which overrides the default variable with the
value 22.