Fujitsu IRF-1D series, User Manual

Page: 43 / 182

Chapter 2 - Topologies and Operating Modes
Multi-Port Mirrored Dual Host System-Quad Connection
31
Multi-Port Mirrored Dual Host System-Quad Connection
This topology provides one of the more robust active-active RAID storage
solution for dual host systems with dual 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 disadvantages are the requirement for dual ported HBA’s and multiple cables.
Duplex Mode Logical View - Multi-Port Mirrored Dual Host System-Quad Connection
In this topology the Host I/O card switch 1, 2, and 6 are set to the “Up” position.
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.
FC HBA 1
Host/Server (Node A) Host/Server (Node B)
FC HBA 2 FC HBA 1 FC HBA 2
H0 H1
Right Host I/O Card
Left Host I/O Card
H0 H1
Controller 0 (C0) Controller 1 (C1)
Port 0 (P0)
Active
Port 1 (P1)
Active
Port 0 (P0)
Active
Port 1 (P1)
Active
Failover
Circuit
Failover
Circuit
imageRAID.book Page 31 Tuesday, September 23, 2003 4:08 PM