Digital Equipment Corporation RAID Array 3000 storage subsystem Guia do Utilizador Página 23

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Chapter 1. Product Overview
EK–SMCPO–UG. A01 1–9
Figure 1–5 Pedestal Rear Panel Components
3
0
0
0
-2
3
A
Controller
(
Bottom
Controller
(
Top
)
Host #1
External
Fault
Host #0
UPS
1.4.6 UltraSCSI Buses
The pedestal contains two, 16-bit, single-ended, wide UltraSCSI buses (factory-
configured as a split bus) that connects the controller(s) to the disk drives.
The split-bus arrangement is divided into two bus paths designated
device port 0
and
device port 1
as shown in Figure 1–6. Port 0 connects the controller to the
upper four devices in the pedestal (IDs 8 through 11) and port 1 connects the
controller to lower three devices (IDs 8 through 10). The device addresses on the
bus are set at the factory by an internal configuration switch (see Figure 1–7).
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