Additional Options (Scsi Device Configuration - Adaptec AAA-130SA SERIES Installation And Hardware Manual

AAA-130SA Series Installation and Hardware Guide

Additional Options (SCSI Device Configuration)

The SCSI device settings allow you to configure certain parameters
for each device on the SCSI bus. 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 SCSI Disk Utilities on page
A-4.
Initiate Sync Negotiation—This option determines whether
synchronous data transfer negotiation (Sync Negotiation)
between the device and AAA-13xSA RAID card is initiated by
the RAID card. Normally, you should leave the Initiate Sync
Negotiation setting enabled, because most SCSI devices sup-
port synchronous negotiation and because it allows for faster
data transfer. The default setting is Yes.
Maximum Sync Transfer Rate—This option determines the
maximum synchronous data transfer rate that the AAA-13xSA
RAID card supports. The default setting is 20.0 MBytes/sec.
(The effective data transfer rate is doubled when Initiate Wide
Negotiation is set to Yes. For example, a transfer rate of 10
MBytes/sec becomes 20 MBytes/sec.)
Enable Disconnection—This option determines whether the
AAA-13xSA RAID card allows the SCSI device to disconnect
from the SCSI bus (sometimes called Disconnect/Reconnect).
The default setting is Yes.
You should leave Enable Disconnection set to Yes if two or
more SCSI devices are connected to the adapter. If only one
SCSI device is connected to the RAID card, you can set Enable
Disconnection to No to achieve slightly better performance.
Initiate Wide Negotiation—This option determines whether
the AAA-13xSA RAID card attempts 16-bit data transfer
instead of 8-bit data transfer. The default setting Yes. (The
effective data transfer rate is doubled when 16-bit data transfer
is used. For example, a transfer rate of 10 MBytes/sec becomes
20 MBytes/sec.)
Send Start Unit Command—This option determines whether
the Start Unit Command is sent to the SCSI device at bootup
(most devices do not require this). The default setting is No.
A-6