Technical data

1–6 HSG80 ACS Solution Software Version 8.6 for Compaq Tru64 UNIX 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