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Wide devices allow data to be transferred at twice the rate of
Narrow devices. The Wide bus is backward compatible with
Narrow devices, allowing both types of SCSI devices to be used
with the same controller. The Narrow interface is still used with
some SCSI devices, such as tape and CD drives.
LVD and SE devices
Attaching a single-ended (SE) SCSI device to an LVD bus causes
the bus to slow down to Ultra SCSI speed (20 MHz) for all
devices.
Note: Adaptec RAID controllers cannot be used with older
SCSI 5-V differential (DE) devices.
SCSI cables
Adaptec recommends you using Ultra160 SCSI devices and good
quality LVD SCSI cables, which can be purchased from Adaptec,
at
www.adaptec.com
SCSI device IDs
The SCSI specification allows up to 7 SCSI devices (and a
controller) to be connected to a single 8-bit SCSI bus. A Wide
SCSI bus can support up to 15 devices and the controller.
All SCSI devices, including the controller, must be assigned a
unique SCSI ID. SCSI IDs, which are typically set using jumpers
or switches on peripheral devices, can be assigned any number
from 0 to 7 for 8-bit SCSI devices or 0 to 15 for Wide SCSI
devices.
Set the SCSI ID of each SCSI device attached to the controller to
a unique ID number between 0 and 6. The Adaptec RAID
controller is set to ID 7 by default (most SCSI controllers use
ID 7). Wide SCSI devices can also use SCSI IDs 8 through 15.
SCSI IDs can only be duplicated on the same controller if the
devices using the same ID are not attached to the same bus.
If necessary, the Adaptec RAID controller ID can be changed to
any ID from 0 through 7. You can use SMOR or the Configure
, or other suppliers.
installing your controller
2-3
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