Fujitsu IRF-1D series, User Manual

Page: 41 / 182

Chapter 2 - Topologies and Operating Modes
Multi-Port Mirrored Single Host-Dual Connection
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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.
Duplex Mode Logical View - Multi-Port Mirrored Single Host-Dual Connection (Failover)
FC HBA 1
Host/Server (Node A)
FC HBA 2
H0 H1
Right Host I/O Card
Left Host I/O Card
H0 H1
Controller 0 (C0) - Failed
Controller 1 (C1)
Port 0 (P0)
Active
Port 1 (P1)
Active
Port 0 (P0)
Failed
Port 1 (P1)
Failed
Failover
Circuit
Failover
Circuit
imageRAID.book Page 29 Tuesday, September 23, 2003 4:08 PM