Adaptec 2820SA User Guide - Page 81

SCSI-specific Controller Settings, SCSI Configuration, Additional Options

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Appendix C: Using the Adaptec RAID Controller Utility ● 81 SCSI-specific Controller Settings In addition to the general settings listed on page 79, your Adaptec SCSI controller has SCSIspecific settings that can be modified if required. To modify SCSI-specific settings, select SCSI Configuration from the SCSISelect main menu. SCSI Device Settings You can use SCSISelect to modify some of the settings on the SCSI devices connected to your SCSI controller. To modify SCSI device settings, select SCSI Configuration from the SCSISelect main menu, then select Additional Options. Devices are listed by SCSI ID. (To find the SCSI ID for a specific device, see Formatting and Verifying Disk Drives on page 82.) For the best device performance, don't change the default settings. Note: Default settings are shown in bold type. Option Maximum Transfer Rate Enable Disconnection Initiate Wide Negotiation QAS Packetized Description Shows the maximum data transfer rate that the SCSI channel supports. When enabled, the SCSI device can disconnect from the SCSI channel. Default is Yes (enabled). When enabled, the SCSI channel attempts 16-bit data transfer instead of 8-bit data transfer. Default is Yes (enabled). When enabled, QAS (Quick Arbitration and Selection) is used to eliminate overhead and speed up data transfers on the SCSI bus. Default is No (disabled). Note-Adaptec recommends that you do not enable QAS if you are using an enclosure that supports Ultra320 expanders. When enabled, SCSI packetization (encapsulation) is used to reduce overhead and speed data transfer. Default is Yes (enabled). SCSI Channel Interface Settings Note: Default settings are shown in bold type. Option Controller SCSI Channel ID SCSI Parity Checking Controller SCSI Channel Termination Description Sets the controller's SCSI ID. Adaptec recommends that you leave the controller set to the default (7), which gives it the highest priority on the SCSI channel. When enabled, the controller verifies the accuracy of data transfer on the SCSI channel. Disable only if the controller is connected to any SCSI device that does not support SCSI parity. Default is enabled. Sets termination on the controller. Adaptec recommends that you retain the default setting (auto mode).

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Appendix C: Using the Adaptec RAID Controller Utility
●
81
SCSI-specific Controller Settings
In addition to the general settings listed on
page 79
, your Adaptec SCSI controller has SCSI-
specific settings that can be modified if required.
To modify SCSI-specific settings, select
SCSI Configuration
from the SCSI
Select
main menu.
SCSI Device Settings
You can use SCSI
Select
to modify some of the settings on the SCSI devices connected to your
SCSI controller.
To modify SCSI device settings, select
SCSI Configuration
from the SCSISelect main menu,
then select
Additional Options
. Devices are listed by SCSI ID. (To find the SCSI ID for a
specific device, see
Formatting and Verifying Disk Drives
on page 82
.)
For the best device performance, don’t change the default settings.
Note:
Default settings are shown in
bold
type.
SCSI Channel Interface Settings
Note:
Default settings are shown in
bold
type.
Option
Description
Maximum
Transfer Rate
Shows the maximum data transfer rate that the SCSI channel supports.
Enable
Disconnection
When enabled, the SCSI device can disconnect from the SCSI channel. Default is
Yes
(enabled).
Initiate Wide
Negotiation
When enabled, the SCSI channel attempts 16-bit data transfer instead of 8-bit
data transfer. Default is
Yes
(enabled).
QAS
When enabled, QAS (Quick Arbitration and Selection) is used to eliminate
overhead and speed up data transfers on the SCSI bus. Default is
No
(disabled).
Note
—Adaptec recommends that you do not enable QAS if you are using an
enclosure that supports Ultra320 expanders.
Packetized
When enabled, SCSI packetization (encapsulation) is used to reduce overhead
and speed data transfer. Default is
Yes
(enabled).
Option
Description
Controller SCSI
Channel ID
Sets the controller’s SCSI ID. Adaptec recommends that you leave the controller
set to the default (
7
), which gives it the highest priority on the SCSI channel.
SCSI Parity
Checking
When enabled, the controller verifies the accuracy of data transfer on the SCSI
channel. Disable only if the controller is connected to any SCSI device that does
not support SCSI parity. Default is
enabled
.
Controller SCSI
Channel
Termination
Sets termination on the controller. Adaptec recommends that you retain the
default setting (
auto mode
).