Specifications

6-26 • Configuring AlphaServer 1000A Owner's Guide
Table 6-3 SCSI Bus Configurations
Controller Description
Single In a single-controller configuration, the Fast SCSI-2
controller on the system board supports the devices
on the removable-media bus and up to five
StorageWorks drives in the internal StorageWorks
shelf. See Figure 6-7.
Dual
Dual, split
backplane
In a dual-controller configuration, the Fast SCSI-2
controller on the system board provides 8-bit SCSI
support for the devices on the removable-media bus.
An additional controller option card on the system
board supports up to seven StorageWorks drives in
the internal StorageWorks shelf. See Figure 6-8.
In a dual-controller configuration with a split
backplane, the Fast SCSI-2 controller on the system
board provides 8-bit SCSI support for the devices on
the removable-media bus and 16-bit SCSI support
for up to four StorageWorks drives in the internal
StorageWorks shelf. An additional controller option
card on the system board supports the remaining
StorageWorks drives in the internal StorageWorks
shelf. See Figure 6-9.
Triple, split-
backplane
In a triple-controller configuration, the Fast SCSI-2
controller on the system board provides 8-bit SCSI
support for the devices on the removable-media bus.
Two additional controller option cards on the system
board support the StorageWorks drives in a split-
backplane configuration. See Figure 6-10.