Adaptec 2110S - SCSI RAID Controller Guía de instalación Pagina 27

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Adaptec RAID Installation Guide
SCSI Termination
The basics of termination are as follows:
Enable termination on the devices on each physical end of a
SCSI cable. Depending upon how you configure your system,
you would either
Enable termination on two SCSI peripheral devices, or
Enable termination on the SCSI controller and one
peripheral SCSI device.
If you are using multiple SCSI channels on a single controller,
terminate each channel separately.
SCSI termination for Adaptec SCSI RAID controllers is configured
through the SMOR utility or from the Configure Host Bus Adapter
window in Storage Manager. The controller has four possible
termination settings, as shown in the following table:
Devices on the second bus (Bus 1) and higher (if the RAID controller
has more than two) must have Wide termination.
By using a 68-pin to 50-pin SCSI cable adapter, a Narrow device can
be attached to a Wide cable along with Wide devices. However, the
device at the end of the cable must be a Wide device so that all SCSI
signals are terminated. For internal and external cables where one
cable is Narrow, set the controller termination to High Only.
Setting Function
Auto Default—Used for all cabling conditions, except where
two Narrow cables are attached or both Narrow and Wide
cables are attached. For these exceptions, use High Only.
1
1
This termination option is not available on the 2000S or 2005S. These ZCR controllers
have only On (enabled) and Off (disabled) available, with On being the default.
High Only Terminates only the additional signals that are used on
Wide SCSI devices. This allows attachment of a Narrow
cable, or both a Wide and Narrow cable together, to be
attached to the controller.
1
Disabled Disables controller termination unconditionally.
Enabled Enables controller termination unconditionally.
COMBINED RAID IG.BOOK Page 4 Tuesday, September 25, 2001 5:46 PM
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