Operating instructions

8
Default Settings
The AHA-2910C has default settings appropriate for
most PCI systems (see the table of settings below). Do not
run SCSISelect unless you want to change a default
setting.
Definitions of SCSISelect Settings
This section defines the SCSI device settings for the host
adapter and for each device on the SCSI bus.
SCSI Bus Interface Definitions
The following definitions are most likely to require
modification:
■
Host Adapter SCSI ID—This option sets the SCSI ID
of the host adapter.
To give the host adapter the highest priority on the
SCSI bus, we recommend that you leave the host
adapter at its default setting of SCSI ID 7.
■
SCSI Parity Checking—This option determines
whether the host adapter verifies the accuracy of
data transferred on the SCSI bus. The default setting
is Enabled.
If any SCSI device connected to the host adapter does
not support SCSI parity, disable SCSI Parity Checking
on the host adapter and all SCSI devices. To deter-
mine if a device supports SCSI parity, consult the
device documentation.
■
Host Adapter SCSI Termination—This option sets
termination on the host adapter. You can set termina-
tion to Automatic, Enabled, or Disabled. In general, you
should leave this option set to its default setting of
Automatic.
SCSI Device Configuration Options
SCSI device configuration options allow you to configure
parameters for each device on the SCSI bus. To configure
a specific device, you must identify the SCSI ID assigned
to that device. To determine the SCSI ID of a device, see
Using the SCSI Disk Utilities on page 9.
■
Initiate Sync Negotiation
—This option determines
whether or not synchronous data transfer negotiation
between the host adapter and a device is initiated by
the host adapter.
The default setting is Ye s (Enabled). Set
Initiate Sync
Negotiation to No for devices that do not support
Sync Negotiation.
■
Maximum Sync Transfer Rate—This option sets the
maximum synchronous data transfer rate that the
host adapter supports. The host adapter supports
rates up to 10 MBytes/sec.
If Initiate Sync Negotiation is set to No, then the max-
imum synchronous transfer rate is the maximum rate
that the host adapter accepts from the device during
negotiation.
■
Enable Disconnection—This option lets a SCSI
device temporarily disconnect the SCSI device from
the SCSI bus. This allows the host adapter to perform
other operations while the SCSI device is discon-
nected. The default setting is Yes. Set Enable Discon-
nection to Yes if two or more SCSI devices are
connected to the host adapter.
Advanced Configuration Options
Plug and Play SCAM Support—This option allows the
host adapter to automatically assign SCSI IDs to SCSI
devices that support the SCAM protocol.
Caution:
The default setting is Disabled. Most
non-SCAM legacy devices tolerate the SCAM
protocol, so you can enable this option even if
you have a non-SCAM device.
SCSI Bus Interface Definitions Default
Host Adapter SCSI ID 7
SCSI Parity Checking Enabled
Host Adapter SCSI Termination Automatic
Additional Options
➤
SCSI Device Configuration
Default
Initiate Sync Negotiation Yes (Enabled)
Maximum Sync Transfer Rate 10 MBytes/sec
Enable Disconnection Yes (Enabled)
Additional Options
➤
Advanced Configuration Options
Default
Plug and Play SCAM Support Disabled