Dell PowerEdge 4300 Dell PowerEdge 4300 Systems User's Guide - Page 45

Initiate Wide Negotiation, Send Start Unit - power requirements

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SCSI device is connected to the host adapter, set Enable Disconnection to No to achieve slightly better performance. Initiate Wide Negotiation - This option determines whether the host adapter attempts 16-bit data transfer instead of 8-bit data transfer. The default for AIC-7890 and 2940U2W host adapters is Yes. NOTE: Some 8-bit SCSI devices may have trouble handling wide negotiation, which may result in erratic behavior or a hang condition. For these devices, set Initiate Wide Negotiation to No. When this option is set to Yes, the host adapter attempts 16-bit transfer. When this option is set to No, 8-bit data transfer is used unless the SCSI device itself requests wide negotiation. The effective transfer rate is doubled when 16-bit data transfer is used because the data path for wide SCSI is twice the size of normal 8-bit SCSI. Send Start Unit - This option determines whether the start unit command is sent to the SCSI device during the boot routine. The default is Yes. Setting this option to Yes reduces the load on your computer's power supply by allowing the host adapter to start SCSI devices one at a time when you boot your system. When this option is set to No, the devices are allowed to start at the same time. Most devices require you to set a jumper before they can respond to this command. NOTE: For many devices, if Send Start Unit is set to Yes, the boot routine time will vary depending on how long it takes each drive to start. BIOS Multiple LUN Support - This option provides support for peripherals that contain multiple SCSI devices, such as redundant arrays of independent disks (RAID) subsystems and CD-ROM changers. The default for the Adaptec AIC-7860 host adapter is Yes; the default for AIC-7890 and 2940U2W host adapters is No. Include in BIOS Scan - This option enables you to set whether the system BIOS scans this device during system start-up. The default is Yes. Advanced Host Adapter settings should not be changed unless absolutely necessary. These values are set by Dell, and changing them may cause conflicts with the SCSI devices. Reset SCSI Bus at IC Initialization - This option enables the SCSI bus to be reset when the controller (integrated circuit [IC]) is initialized. The default is Enabled. Extended BIOS Translation For DOS Drives > 1 GB - This option determines whether extended translation is available for SCSI hard-disk drives with capacities greater than 1 gigabyte (GB). The default is Enabled. Installing and Configuring SCSI Drivers 3-7

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Installing and Configuring SCSI Drivers
3-7
SCSI device is connected to the host adapter, set
Enable Disconnection
to
No
to achieve slightly better performance.
²
Initiate Wide Negotiation
— This option determines whether the host adapter
attempts 16-bit data transfer instead of 8-bit data transfer. The default for
AIC-7890 and 2940U2W host adapters is
Yes
.
NOTE: Some 8-bit SCSI devices may have trouble handling wide negotiation,
which may result in erratic behavior or a hang condition. For these devices, set
Initiate Wide Negotiation
to
No
.
When this option is set to
Yes
, the host adapter attempts 16-bit transfer. When
this option is set to
No
, 8-bit data transfer is used unless the SCSI device itself
requests wide negotiation. The effective transfer rate is doubled when 16-bit data
transfer is used because the data path for wide SCSI is twice the size of normal
8-bit SCSI.
²
Send Start Unit
— This option determines whether the
start unit
command is
sent to the SCSI device during the boot routine. The default is
Yes
.
Setting this option to
Yes
reduces the load on your computer’s power supply by
allowing the host adapter to start SCSI devices one at a time when you boot your
system. When this option is set to
No
, the devices are allowed to start at the
same time. Most devices require you to set a jumper before they can respond to
this command.
NOTE: For many devices, if
Send Start Unit
is set to
Yes
, the boot routine time
will vary depending on how long it takes each drive to start.
²
BIOS Multiple LUN Support
— This option provides support for peripherals that
contain multiple SCSI devices, such as redundant arrays of independent disks
(RAID) subsystems and CD-ROM changers. The default for the Adaptec AIC-7860
host adapter is
Yes
; the default for AIC-7890 and 2940U2W host adapters is
No
.
²
Include in BIOS Scan
— This option enables you to set whether the system
BIOS scans this device during system start-up. The default is
Yes
.
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Advanced Host Adapter
settings should
not
be changed unless absolutely neces-
sary. These values are set by Dell, and changing them may cause conflicts with the
SCSI devices.
²
Reset SCSI Bus at IC Initialization
— This option enables the SCSI bus to be
reset when the controller (integrated circuit [IC]) is initialized. The default is
Enabled
.
²
Extended BIOS Translation For DOS Drives > 1 GB
— This option determines
whether extended translation is available for SCSI hard-disk drives with capacities
greater than 1 gigabyte (GB). The default is
Enabled
.
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