Adaptec 2940W Installation Manual page 4

Pci-to-fast scsi host adapter with scsiselect
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Configuring the Host Adapter on page 8. To change the
SCSI ID on your hard disk and other SCSI devices,
refer to the device's documentation.
The AHA-2940/2940W supports the SCSI Config-
ured AutoMatically (SCAM) protocol, which
assigns SCSI IDs dynamically and resolves SCSI ID
conflicts automatically at bootup. If your system
includes SCSI disk drives or other devices that sup-
port SCAM, you do not need to manually assign
SCSI IDs to these devices. To disable SCAM support,
see Configuring the Host Adapter on page 8.
Most SCSI devices currently in use, however, do not
support SCAM. The SCSI IDs on these devices must
be set manually. To change the SCSI IDs on these
devices, refer to the device's documentation.
Note:
a SCSI device attached to the AHA-2940/
2940W, set the Boot Target ID setting in the
SCSISelect utility to correspond to the SCSI
ID of the device you are booting from (see
Configuring the Host Adapter on page 8).
SCSI Terminators
To ensure reliable communication, the SCSI bus must
be properly terminated. Termination is controlled by
a set of electrical resistors, called terminators. Termi-
nators must be placed (or enabled) at the two
extreme ends of the SCSI bus. All devices that lie
between the ends must have their terminators
removed (or disabled).
Terminating the AHA-2940
Termination on the AHA-2940 itself is controlled by
software commands via the SCSISelect utility. The
default setting is Automatic, which works like this:
If the AHA-2940 detects that a cable is connected
to either its internal or external SCSI connector,
then it enables its terminators (the AHA-2940 is at
the end of the SCSI bus).
If you plan to boot your computer from
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