Fujitsu IRF-1D series, User Manual

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Chapter 2 - Topologies and Operating Modes
Multi-Port Mirrored Single Host-Dual Connection
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Multi-Port Mirrored Single Host-Dual Connection
This Multi-Port Mirrored topology provides an active-active RAID storage solution
for single host systems with dual Fibre ports where fault-tolerant RAID disk
subsystem storage is required. It has several advantages: redundant active-active
controllers, and transparent failover and failback operations, LUN isolation (LUNs
appear only once to the host OS), and dual connections for higher performance
independent access to assigned LUNs.
It has two disadvantages which are the host HBA and the single fibre loop which
are single points of failure.
Duplex Mode Logical View - Multi-Port Mirrored Single Host-Dual 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)
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 28 Tuesday, September 23, 2003 4:08 PM