Fujitsu IRF-1S series User Manual page 42

Chapter 2 - Topologies and Operating Modes
Multi-Port Mirrored Dual Host System-Single Connection
This topology provides one of the more robust active-active RAID storage
solution for dual host systems with single Fibre ports. It has the following
advantages: high availability and high-performance where each host requires
access to all LUNs, redundant active-active RAID controllers, transparent failover
and failback, and shared storage between two host systems.
Its disadvantage is the single fibre loop which becomes a single point of failure.
In this topology the Host I/O card switch 1, 2, and 6 are set to the "Up" position.
30
Multi-Port Mirrored Dual Host System-Single Connection
Host/Server (Node A)
FC HBA 1
H1
Right Host I/O Card
Failover
Circuit
Port 0 (P0) Port 1 (P1)
Active
Controller 0 (C0)
Duplex Mode Logical View - Multi-Port Mirrored Dual Host System-Single Connection
Switch 1 sets the bus speed mode on the Host I/O card to 2 GB/sec.
Switch 2 configures the enclosure for the imageRAID Controller.
Switch 6 enables automatic internal hub failover during a controller failure.
H0
Active
Host/Server (Node B)
FC HBA 1
H1 H0
Left Host I/O Card
Failover
Circuit
Port 0 (P0) Port 1 (P1)
Active Active
Controller 1 (C1)