Asus Adaptec 2020 ZCR User Manual - Page 78

Configuration, Additional Options, The SCSI Device

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Adaptec RAID Configuration Utility (ARC) SCSI Device Configuration Options The SCSI device settings allow you to configure certain parameters for each device on the SCSI channel. To configure settings for a specific device, you must know the SCSI ID assigned to that device. If you are not sure of the SCSI ID, see Using the Disk Utilities on page A-14. To access the SCSI Device Configuration options, select SCSI Configuration, then select Additional Options. The SCSI Device Configuration options are described in the table below. Note: For maximum performance, Adaptec recommends that you retain the default settings. SCSI Device Configuration Options Option Default Description Maximum Transfer Rate N/A Determines the maximum data transfer rate that the SCSI channel supports. The maximum effective data transfer rate is doubled when Initiate Wide Negotiation is set to Yes and 16-bit devices are attached. (Initiate Wide Negotiation has no effect with 8-bit devices.) Enable Yes Disconnection Determines whether the SCSI channel allows the SCSI device to disconnect from the SCSI channel (sometimes called Disconnect/ Reconnect or Reselection). Initiate Wide Yes Negotiation QAS No1 Determines whether the SCSI channel attempts 16-bit data transfer instead of 8-bit data transfer. The effective data transfer rate is doubled when 16-bit data transfer is used. Determines whether QAS (Quick Arbitration and Selection) is used to eliminate overhead and speed up data transfers on the SCSI bus. Packetized Yes Determines whether SCSI packetization (encapsulation) is used to reduce overhead and speed data transfer. The packetized SCSI protocol provides a method for transferring command and status information at the maximum rate. 1. Adaptec recommends that you not enable QAS if you are using an enclosure that contains Ultra320 expander ICs. A-13

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A-13
Adaptec RAID Configuration Utility (ARC)
SCSI Device Configuration Options
The SCSI device settings allow you to configure certain parameters
for each device on the SCSI channel. To configure settings for a
specific device, you must know the SCSI ID assigned to that device.
If you are not sure of the SCSI ID, see
Using the Disk Utilities
on
page A-14
.
To access the SCSI Device Configuration options, select
SCSI
Configuration
, then select
Additional Options
. The SCSI Device
Configuration options are described in the table below.
Note:
For maximum performance, Adaptec recommends that
you retain the default settings.
SCSI Device Configuration Options
Option
Default
Description
Maximum
Transfer Rate
N/A
Determines the maximum data transfer rate
that the SCSI channel supports. The maximum
effective data transfer rate is doubled when
Initiate Wide Negotiation
is set to
Yes
and 16-bit
devices are attached. (
Initiate Wide Negotiation
has no effect with 8-bit devices.)
Enable
Disconnection
Yes
Determines whether the SCSI channel allows
the SCSI device to disconnect from the SCSI
channel (sometimes called Disconnect/
Reconnect or Reselection).
Initiate Wide
Negotiation
Yes
Determines whether the SCSI channel attempts
16-bit data transfer instead of 8-bit data transfer.
The effective data transfer rate is doubled when
16-bit data transfer is used.
QAS
No
1
1. Adaptec recommends that you not enable QAS if you are using an enclosure that
contains Ultra320 expander ICs.
Determines whether QAS (Quick Arbitration
and Selection) is used to eliminate overhead
and speed up data transfers on the SCSI bus.
Packetized
Yes
Determines whether SCSI packetization
(encapsulation) is used to reduce overhead and
speed data transfer. The packetized SCSI
protocol provides a method for transferring
command and status information at the
maximum rate.