21
Configuring the Adaptec SCSI Card 19160 with SCSISelect
■
Sync Transfer Rate
—(Default:
160
) Determines the maximum
synchronous data transfer rate that the SCSI device supports.
Use the maximum value of 160 MBytes/sec. If a device is not
Ultra160, select the transfer rate of the device (80, 53, 40, ...).
■
Initiate Wide Negotiation
—(Default:
Yes
) When set to
Yes
, the
SCSI card attempts 16-bit data transfer (wide negotiation).
When set to
No
, the SCSI card uses 8-bit data transfer unless
the SCSI device requests wide negotiation.
Note:
Set Initiate Wide Negotiation to
No
if you are
using an 8-bit SCSI device that hangs or exhibits other
performance problems with 16-bit data transfer rate
enabled.
■
Enable Disconnection
—(Default:
Yes
) When set to
Yes
, allows
the SCSI device to disconnect from the SCSI bus. Leave the set-
ting at
Yes
if two or more SCSI devices are connected to the
SCSI card. If only one SCSI device is connected, changing the
setting to
No
results in slightly better performance.
■
Send Start Unit Command
—(Default:
Yes
) When set to
Yes
,
the Start Unit Command is sent to the SCSI device at bootup.
The following three options have no effect when the SCSI Card BIOS
is disabled. (The SCSI Card BIOS is normally enabled by default.)
■
Enable Write Back Cache
—(Default:
N/C
) Can be used to
enable or disable the write-back cache on SCSI disk drives con-
nected to the host adapter. Leave this option at its default
setting of N/C (no change), which usually allows for optimum
drive performance.
■
BIOS Multiple LUN Support
—(Default:
No
) Leave this set-
ting at
No
if the device does not have multiple Logical Unit
Numbers (LUNs). When set to
Yes
, the SCSI card BIOS pro-
vides support for a SCSI device with multiple LUNs (for exam-
ple, a CD “juke box” device in which multiple CDs can be
accessed simultaneously).
■
Include in BIOS Scan
—(Default:
Yes
) When set to
Yes
, the
SCSI card BIOS includes the device as part of its BIOS scan at
bootup.
