HP StorageWorks HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide (AA-RV1VA-TE, March 2005)

Planning a Subsystem
32 HSG80 ACS Solution Software V8.8 for 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 8: 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