Digital PRIORIS XL Server
Digital PRIORIS XL Server
Service Procedures
Service Procedures
MCS Logistics Engineering - Nijmegen
MCS Logistics Engineering - Nijmegen
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SCSI Configuration Guidelines
The PRIORIS XL Server includes an onboard Adaptec AIC-7870 SCSI controller. The AIC-7870
connects directly to the PCI local bus and supports up to seven SCSI devices installed within the server
enclosure. Additional SCSI devices can be added to the server by using an EISA- or PCI-based SCSI
controller installed in an available expansion slot in conjunction with an external SCSI expansion box.
The onboard SCSI controller also supports either industry-standard 8-bit, narrow, 50-pin or 16-bit, wide,
68-pin SCSI devices. Separate SCSI interface connectors are provided on the main logic board to connect
either type of SCSI interface cable. In most cases the server has been supplied with a standard 50-pin SCSI
ribbon cable installed at the factory.
The following SCSI cables are available:
♦
68-pin wide internal SCSI ribbon cable.
♦
Wide-to-narrow cable adapter for internal wide SCSI ribbon cable.
♦
Narrow internal channel - adding a narrow external channel
♦
Narrow internal channel - adding a wide external channel
♦
Wide internal channel - adding a narrow external channel
Refer to the Extended Parts List for partnumbers
The server configuration, SCSI controller, and all SCSI devices must work together for optimum
performance. Use the following guidelines to configure the server and all SCSI devices:
♦
Each SCSI device (including the SCSI host adapter) must be configured with a unique ID number.
SCSI host adapters usually default to ID 7. Use SCSI ID 0 through 6 (narrow devices) and 0 through
15 (wide devices) for the remaining SCSI devices. Hard disk drives should be configured to start
with SCSI ID 0 and the lower ID numbers.
♦
Both ends of the SCSI chain must be properly terminated. The sever comes with the main logic board
SCSI terminators enabled. This properly terminates the SCSI controller (the first device in the SCSI
chain). The supplied SCSI ribbon cable is equipped with an active SCSI terminator installed at the
end of the cable. Use only the SCSI cable supplied with the server.
SCSI device drivers are required to operate the SCSI devices.
Refer to Chapter 2, “Server Utilities
and Configuration”
for creating and loading the SCSI device drivers
.
♦
You can add 50-pin SCSI devices to a server equipped with a 68-pin wide SCSI ribbon cable. This
cable is supplied with three 68-pin to 50-pin SCSI interface converter cables to allow adding SCSI
devices such as tape drives and CD-ROM systems that are not presently offered with 68-pin SCSI
interfaces.
NOTE
68-pin wide SCSI
devices cannot be added to a SCSI cable connected to the main
logic board’s 50-pin narrow SCSI interface connector.
♦
SCSI hard disk drives are low-level formatted at the factory. Use the appropriate operating system
command to high-level format any hard disk drive.
♦
If the server boots from a disk drive other than SCSI, make sure all SCSI device drivers are installed
on that disk drive. SCSI devices can be used with an IDE drive only if the IDE drive is configured as
drive C.
♦
Make sure the proper SCU setup options are set for SCSI operation. Refer to,
“Configuring The
Server”, for additional information.
