Fujitsu IRF-1S series User Manual page 41

Chapter 2 - Topologies and Operating Modes
Example of Multi-Port Mirrored in Fail-Over Mode
The following illustration demonstrates how the ports failover in the Multi-Port
Mirrored topology.
Switch 6 which enables automatic internal hub failover when a controller failure
is detected and also controls the logical function of switch 4. When a controller
failure is detected, the logic circuit will close connecting the "H0" and "H1" ports
on the Host I/O card, regardless of the physical position of switch 4.
As shown below even though switch 4 is disabled (down position) when the
controller failed, switch 6 logically enabled that circuit providing alternate paths
to the surviving controller ports.
Host/Server (Node A)
FC HBA 1 FC HBA 2
H1 H0
H1 Left Host I/O Card
H0
Right Host I/O Card
Failover
Failover
Circuit
Circuit
Port 0 (P0) Port 1 (P1) Port 0 (P0) Port 1 (P1)
Failed Failed Active Active
Controller 0 (C0) - Failed
Controller 1 (C1)
Duplex Mode Logical View - Multi-Port Mirrored Single Host-Dual Connection (Failover)
29
Multi-Port Mirrored Single Host-Dual Connection