
Digital PRIORIS HX MP Server
Digital PRIORIS HX MP Server
Service Procedures
Service Procedures
MCS Logistics Engineering - Nijmegen
MCS Logistics Engineering - Nijmegen
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Using Multiple or Multi-Channel SCSI Host Adapters
The following guidelines apply when configuring the server using multiple or multi-channel SCSI host
adapters:
♦
The SCSI host adapter with the lowest BIOS address is identified by the server as the “primary” SCSI
host adapter. When loading the operating system from a SCSI hard disk drive, this primary or boot
drive must be connected to the primary SCSI host adapter. The SCSI address of the primary SCSI
hard disk drive must be set to the lowest SCSI address connected to the SCSI host adapter.
♦
To improve server performance, the SCSI devices may be distributed across the SCSI host adapters.
When arranging SCSI devices, make sure each device connected to a SCSI host adapter is assigned a
unique SCSI address.
♦
Each operating system has different limitations regarding the number of SCSI host adapters that are
supported. Refer to the operating system documentation for additional information.
♦
SCSI IDs on one channel do not interfere with the IDs on another channel. This applies when
installing two SCSI host adapters that implement a different bus as well as dual channels on a single
SCSI host adapter.
External SCSI Bus
Additional SCSI cables and/or host adapters may be used to connect external SCSI devices to the server.
To connect the storage backplane to an external SCSI bus:
1) Remove the terminator from the storage backplane for the bus to be connected.
2) Connect the 68-pin unshielded cable connector to the storage backplane
(A, Figure 3-27).
3) Using a screwdriver, gently pry
away one of the SCSI
knockouts at the rear panel
(see Figure 3-27).
4) Screw the 68-pin or 50-pin
external shielded connector to
the rear panel
(B, Figure 3-27).
5) Connect the external SCSI
device making sure the external
device is properly terminated.
Figure 3 - 27 Extrernal SCSI Bus
Connections
DEC00444
A
B