Diagnostic Tools and Setup Utilities
HP ProLiant ML150 Generation 2 Server Maintenance and Service Guide
3-13
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Configuring SCSISelect Settings
SCSI Bus Interface Definitions
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SCSI Controller ID (Default: 7) Set the SCSI ID for the SCSI host bus adapter. The
Ultra320 SCSI Host Bus Adapter is set at 7, which gives it the highest priority on the
SCSI bus. We recommend that you do not change this setting.
•
SCSI Controller Parity (Default: Enabled) Verify the accuracy of data transfer on the
SCSI bus when set to Enabled. Leave this setting enabled unless any SCSI device
connected to the Ultra320 SCSI Host Bus Adapter does not support SCSI parity.
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SCSI Controller Termination (Default: Enabled) Determine the termination setting for
the SCSI host bus adapter. The default setting for both the LVD/SE and SE connectors is
Automatic, which allows the SCSI host bus adapter to adjust the termination as needed
depending on the configuration of the connected SCSI devices. We recommend that you
do not change this setting.
Additional Options
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Boot Device Configuration Display the information of the master SCSI controller.
•
SCSI Device Configuration SCSI Device Configuration options can be set individually
for each connected SCSI device.
NOTE: To configure settings for a SCSI device, you must know its SCSI ID (refer to “Using SCSI Disk
Utilities” on page 3-15).
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Sync Transfer Rate (Default: 320) Determine the maximum synchronous data
transfer rate that the SCSI host adapter supports. Use the maximum value of 320
MBytes/sec. If a device is not Ultra320, select the transfer rate of the device (80, 53,
40, ...).
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Packetized (Default: Yes) Packetization creates information units (IUs) comprised
of commands, data, status information and other things. These IUs are passed as
synchronous transfers, reducing overhead and improving overall efficiency.
—
QAS (Default: Yes) QAS speeds up the arbitration process by eliminating the bus
free phase. Combined with packetization, this significantly improves bus efficiency.
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Initiate Wide Negotiation (Default: Yes) When set to Yes, the SCSI host bus
adapter attempts 16-bit data transfer (wide negotiation). When set to No, the SCSI
host bus adapter uses 8-bit data transfer unless the SCSI device requests wide
negotiation.
NOTE: Set Initiate Wide Negotiation to No if you are using an 8-bit SCSI device that hangs or
exhibits other performance problems with 16-bit data transfer rate enabled.
—
Enable Disconnection (Default: Yes) When set to Yes, allows the SCSI device to
disconnect from the SCSI bus. Leave the setting at Yes if two or more SCSI devices
are connected to the SCSI host bus adapter. If only one SCSI device is connected,
changing the setting to No results in slightly better performance.
