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Installing and Configuring SCSI Drivers 3-7
Enable Disconnection This option (sometimes called
disconnect/reconnect
)
determines whether the host adapter allows the SCSI device to disconnect from
the SCSI bus. Enabling disconnection allows the host adapter to perform other
operations on the SCSI bus while the SCSI device is temporarily disconnected.
The default is Yes.
Leave Enable Disconnection set to Yes if two or more SCSI devices are con-
nected to the host adapter. This optimizes SCSI bus performance. If only one
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 Ye s, 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 for AIC-7860,
AIC-7890, and 2940U2W host adapters is Ye s .
Setting this option to Yes reduces the load on your computers 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 AIC-7860, 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 for AIC-7860,
AIC-7890, and 2940U2W host adapters is Ye s .
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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.
3502Ebk0.book Page 7 Friday, November 13, 1998 10:00 AM