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Compaq ProLiant 5000 Servers Reference Guide
Writer: Project: Fast-Wide SCSI-2 Subsystem Comments:
File Name: L-ch8.doc Last Saved On: 4/23/96 11:26 AM
SCSI-2 Device Installation
All SCSI hard drives on the same SCSI channel must be either internal or in
an external storage system, but not both. A configuration with both internal
and external SCSI drives requires more than one single-channel SCSI
controller or a multi-channel controller such as the SMART SCSI Array
Controller.
SCSI IDs
The Fast-Wide SCSI-2 controller contains a single SCSI-2 bus that supports
up to seven SCSI-2 peripherals. The internal and external connectors reside on
the same SCSI-2 bus, and peripherals attached to either connector must have a
unique SCSI ID. Switches or jumpers on SCSI-2 peripherals select a SCSI ID
that ranges from 0 to 6. The SCSI ID determines the device's priority when
attempting to control the Fast-Wide SCSI-2 bus. The server assigns the SCSI-
2 controller to the highest priority by setting the controller's SCSI ID to 7. For
maximum performance, connect low throughput peripherals on separate Fast-
Wide SCSI-2 buses. If low-throughput peripherals are connected to the same
bus as high-throughput peripherals, the low peripherals should be assigned to
high SCSI IDs to prevent starvation by high bandwidth devices such as SCSI-
2 hard drives.
Use the Inspect Utility to obtain the SCSI ID of the installed SCSI-2
peripherals.
