Adaptec SCSI RAID 2100S Quick Start Manual page 12

Configuring SCSI Termination
The physical ends of each SCSI bus must be terminated. Depending
upon how you configure your system, you will either terminate two
SCSI devices, or the SCSI controller and one peripheral SCSI device or
the last connector on the cable. Ultra2 and Ultra160 devices typically do
not provide built-in termination.
Note:
If you are using multiple SCSI busses on a single
controller, each separate bus must be terminated.
SCSI termination for SCSI RAID controllers is configured through the
SMOR utility or from the Configure Host Bus Adapter dialog in
Storage Manager. The controller has four possible termination settings.
These are listed in the following table.
Auto The default setting. This setting can be used for all cabling
conditions, except where two Narrow (8-bit) cables are
attached or both a Narrow and Wide cable are used. For this
case, use High Only.
Disabled
Turns off controller termination unconditionally.
Enabled Turns on controller termination unconditionally.
High Only
Terminates only the additional signals that are used on Wide
SCSI devices. This allows a Narrow cable or a Wide and
Narrow cable to be simultaneously attached to the controller.
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