HSG80 ACS Solution Software V8.6 for Windows NT and Windows 2000 Installation and Configuration Guide

1–6 HSG80 ACS Solution Software Version 8.6 for Windows NT and Windows 2000 Installation and
Configuration Guide
Units are divided between the host ports:
■ Units 0-99 are on host port 1 of both controllers (but accessible only through the active
port).
■ Units 100-199 are on host port 2 of both controllers (but accessible only through the
active port).
Transparent failover only compensates for a controller failure, and not for failures of either
the Fibre Channel link or host Fibre Channel adapters.
Figure 1–5. Transparent failover—normal operation
CXO7036A
Host
port 1
active
Host
port 2
active
D100 D101 D120D0 D1
Host 1
Switch or hub
Host 2
Switch or hub
Host 3
Controller A
Controller B
Host
port 2
standby
Host
port 1
standby