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Installing and Configuring SCSI Drivers 3-5
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The basic host adapter settings are the SCSI
Select
settings most likely to require
modification:
Host Adapter SCSI ID — This option sets the host adapter’s SCSI ID. The default
setting is SCSI ID 7, which allows the host adapter to support narrow SCSI
devices in addition to wide SCSI devices. Dell recommends that you leave the
host adapter set to SCSI ID 7.
SCSI Parity Checking — This option determines whether the host adapter verifies
the accuracy of data transfer on the SCSI bus. The default is Enabled. You should
disable SCSI Parity Checking if any SCSI device connected to the host adapter
does not support SCSI parity; otherwise, leave it enabled. Most SCSI devices
support SCSI parity. If you are unsure if a device supports SCSI parity, consult the
documentation for the device.
Host Adapter SCSI Termination — This option sets termination on the host
adapter. The default for the Adaptec AIC-7860 host adapters is Enabled; the
default for the AIC-7890 host adapter is Automatic. Dell recommends that you
leave this option set to the default.
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The boot device options allow you to specify the device from which to boot your
system:
Boot Target ID — This option specifies the SCSI ID of the device from which you
boot your system. SCSI IDs are set for the hard-disk drive according to the drive’s
location on the backplane board for the SCSI ID of each drive location. The default
for Boot Target ID is SCSI ID 0.
Boot LUN Number — If your boot device has multiple logical unit numbers
(LUNs) and Multiple LUN Support is enabled (see “Advanced Host Adapter Set-
tings” found later in this section), this option allows you to specify a particular
LUN from which to boot on your boot device. The default is LUN 0.
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The SCSI device/configuration settings allow you to configure certain parameters for
each device on the SCSI bus. To configure a specific device, you must know the SCSI
ID assigned to that device. If you are not sure of the SCSI ID, see “Using the SCSI
Disk Utilities” found later in this section.
Initiate Sync Negotiation — This option determines whether the host adapter
initiates synchronous data transfer negotiation (sync negotiation) between itself
and the device. The default is Yes.
Synchronous data transfer negotiation is a SCSI feature that allows the host
adapter and its attached SCSI devices to transfer data in synchronous mode.
Synchronous data transfer is faster than asynchronous data transfer.
The host adapter always responds to sync negotiation if the SCSI device initiates
it. If neither the host adapter nor the SCSI device initiates sync negotiation, data
is transferred asynchronously.