Specifications

6-36 • Configuring AlphaServer 1000A Owner's Guide
Table 6-6 SCSI IDs for Dual-Controller Split-BackplaneConfiguration
SCSI Device SCSI ID
Bus A
CDROM drive 4
Tape drive 5
Slot 4 0
Slot 5 1
Slot 6 2
Bus B
Slot 0 0
Slot 1 1
Slot 2 2
Slot 3 3
Triple-Controller, Split-Backplane Configuration
In the triple-controller configuration shown in Figure 6-10, two SCSI controllers are
used to configure the StorageWorks backplane. The seven StorageWorks devices
are divided between two PCI or EISA SCSI option controller adapters (bus B and
bus C). Bus A includes the CDROM drive and the tape drive, if one is installed.
There are two external terminators, one for each SCSI option controller used. Table
6-7 shows the SCSI ID settings for this configuration. The features of this
configuration are listed below:
Caution:
Avoid bending the SCSI cable when
folding it.