Fujitsu IRF-1D series, User Manual

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Chapter 2 - Topologies and Operating Modes
Multi-Port Mirrored Single Host-Single Connection
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Multi-Port Mirrored Single Host-Single Connection
This topology provides an redundant RAID storage solution for single host systems
with one fibre port where a fault-tolerant disk subsystem storage is required. It has
the following advantages: initial lower costs, redundant RAID controllers, and
transparent failover and failback operations. It has several disadvantages:
performance limited bandwidth capabilities due to the single Fibre loop, and the
host system, host HBA and the single fibre loop are single points of failure.
Duplex Mode Logical View - Multi-Port Mirrored Single Host-Single Connection
In this topology the Host I/O card switches 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)
H0
H1
Right Host I/O Card
Left Host I/O Card
Failover
Circuit
H0 H1
Failover
Circuit
Port 0 (P0)
Active
Port 1 (P1)
Active
Port 0 (P0)
Active
Port 1 (P1)
Active
Controller 0 (C0) Controller 1 (C1)
imageRAID.book Page 27 Tuesday, September 23, 2003 4:08 PM