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Connecting External Options
Setting SCSI IDs for External Devices
You must set a unique SCSI ID for each SCSI device that is
connected to a SCSI-2 controller, so that the SCSI-2 controller can
identify the devices and ensure that different devices do not attempt
to transfer data at the same time. Therefore, do not set the SCSI IDs
for external devices to the values that you use for internal devices.
Refer to the instructions that come with the SCSI devices for more
information about setting a SCSI ID.
Notes:
1. If you install a SCSI-2 adapter, you can use the same SCSI IDs
that you use for the integrated SCSI-2 controllers.
2. The two integrated SCSI-2 controllers on the system board
operate independently. Each controller can support a maximum
of 14, 8-bit or 16-bit SCSI devices. The 16-bit devices support
SCSI IDs 0 to 15, and the 8-bit devices support SCSI IDs 0 to 7.
Your server automatically sets SCSI IDs for hot-swap drives. These
IDs are set according to the jumper settings on the hot-swap
backplanes. The SCSI ID for the preinstalled CD-ROM drive is set
to 5, the SCSI ID for the backplane is set to 6, and the SCSI ID for
the SCSI-2 controller is set to 7. The processing sequence for SCSI
devices is set according to their IDs.
Chapter 4. Installing Options 209