Adaptec AAA-UDMA Hardware Guide - Page 61

BIOSSelect Settings, Bus Interface Definitions, Device Configuration

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Using BIOSSelect and Disk Utilities BIOSSelect Settings Bus Interface Definitions The following settings are the BIOSSelect settings most likely to require any modification: s Host Adapter ID- Sets the ID for the AAA-UDMA. The AAA-UDMA is set to ID 7, which gives it the highest priority on the bus. We recommend you do not change this setting. s Parity Checking-When set to Enabled, verifies the accuracy of data transfer on the bus. Leave this setting Enabled unless any device connected to the AAA-UDMA does not support parity. Device Configuration To configure settings for a specific device, you must know the ID assigned to that device (see Using the Disk Utilities on page A-4.) s Enable Disconnection-When set to Yes, allows the device to disconnect from the bus (sometimes called Disconnect/Reconnect). Leave the setting at Yes if two or more devices are connected to the AAA-UDMA. If only one device is connected, changing the setting to No results in slightly better performance. s Initiate Wide Negotiation-When set to Yes, the AAA-UDMA attempts 16-bit data transfer (wide negotiation). When set to No, the AAA-UDMA uses 8-bit data transfer unless the device requests wide negotiation. Note: Set Initiate Wide Negotiation to No if you have an 8-bit device that hangs or exhibits other performance problems. s Send Start Unit Command-When set to Yes, sends the Start Unit Command to the device at bootup. s Include in BIOS Scan-When set to Yes, the AAA-UDMA BIOS includes the device as part of its BIOS scan at bootup. Leave this setting at Yes for all hard disks that are part of an array. A-5

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A-5
Using BIOSSelect and Disk Utilities
BIOS
Select
Settings
Bus Interface Definitions
The following settings are the BIOS
Select
settings most likely to
require any modification:
■
Host Adapter ID
— Sets the ID for the AAA-UDMA. The
AAA-UDMA is set to ID 7, which gives it the highest priority
on the bus. We recommend you do not change this setting.
■
Parity Checking
—When set to
Enabled
, verifies the accuracy
of data transfer on the bus. Leave this setting Enabled unless
any device connected to the AAA-UDMA does not support
parity.
Device Configuration
To configure settings for a specific device, you must know the ID
assigned to that device (see
Using the Disk Utilities
on page A-4.)
■
Enable Disconnection
—When set to
Yes
, allows the device to
disconnect from the bus (sometimes called Disconnect/Recon-
nect). Leave the setting at Yes if two or more devices are con-
nected to the AAA-UDMA. If only one device is connected,
changing the setting to No results in slightly better
performance.
■
Initiate Wide Negotiation
—When set to
Yes
, the AAA-UDMA
attempts 16-bit data transfer (wide negotiation). When set to
No
, the AAA-UDMA uses 8-bit data transfer unless the device
requests wide negotiation.
Note:
Set Initiate Wide Negotiation to
No
if you have an
8-bit device that hangs or exhibits other performance prob-
lems.
■
Send Start Unit Command
—When set to
Yes
, sends the Start
Unit Command to the device at bootup.
■
Include in BIOS Scan
—When set to
Yes
, the AAA-UDMA
BIOS includes the device as part of its BIOS scan at bootup.
Leave this setting at Yes for all hard disks that are part of an
array.