Adaptec AHA-1540CP Betriebsanweisung PDF herunterladen (Seite 93)

6-11

SCO UNIX Installation

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.

Examples

■ alad_parity[SCSI_NALAD]—specifies whether the host adapter

checks parity on incoming SCSI data. If the second number is set to

0, parity checking is enabled. If it is set to 1, parity checking is

disabled.

■ alad_parity[SCSI_NALAD]—in this example you want the host

adapter not to check parity on incoming SCSI data; define parameters

alad_parity[SCSI_NALAD] = {1,0};

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