HP NetServer LP 2000r HP Netserver Ultra3 SCSI HBA Guide - Page 25

Advanced Configuration Options

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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. • Send Start Unit Command-(Default: Yes) When set to Yes, the Start Unit Command is sent to the SCSI device at bootup. The following three options have no effect when the SCSI host bus adapter BIOS is disabled. (The SCSI host bus adapter BIOS is normally enabled by default.) • Enable Write Back Cache-(Default: N/C) Can be used to enable or disable the write-back cache on SCSI disk drives connected to the host adapter. Leave this option at its default setting of N/C (no change), which usually allows for optimum drive performance. • BIOS Multiple LUN Support-(Default: No) Leave this setting at No if the device does not have multiple Logical Unit Numbers (LUNs). When set to Yes, the SCSI host bus adapter BIOS provides boot support for a SCSI device with multiple LUNs (for example, a CD "juke box" device in which multiple CDs can be accessed simultaneously). • Include in BIOS Scan-(Default: Yes) When set to Yes, the SCSI host bus adapter BIOS includes the device as part of its BIOS scan at bootup. Advanced Configuration Options NOTE Do not change the Advanced Configuration Options unless absolutely necessary. 19

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19
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.
•
Send Start Unit Command
—(Default:
Yes
) When set to
Yes
, the Start
Unit Command is sent to the SCSI device at bootup.
The following three options have no effect when the SCSI host bus adapter
BIOS is disabled. (The SCSI host bus adapter BIOS is normally enabled by
default.)
•
Enable Write Back Cache
—(Default:
N/C
) Can be used to enable or
disable the write-back cache on SCSI disk drives connected to the host
adapter. Leave this option at its default setting of N/C (no change), which
usually allows for optimum drive performance.
•
BIOS Multiple LUN Support
—(Default:
No
) Leave this setting at
No
if
the device does not have multiple Logical Unit Numbers (LUNs). When
set to
Yes
, the SCSI host bus adapter BIOS provides boot support for a
SCSI device with multiple LUNs (for example, a CD “juke box” device
in which multiple CDs can be accessed simultaneously).
•
Include in BIOS Scan
—(Default:
Yes
) When set to
Yes
, the SCSI host
bus adapter BIOS includes the device as part of its BIOS scan at bootup.
Advanced Configuration Options
NOTE
Do not change the Advanced Configuration Options unless absolutely
necessary.