Fujitsu IRF-1D series, User Manual

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Chapter 2 - Topologies and Operating Modes
Dual Port Single Host Dual Connection
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In this topology the Host I/O card switches 1, 2, and 4 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 4 provides the link between the Host I/O card “H0” and “H1” ports to
the same Fibre loop.
Dual Port Single Host Dual Connection
This topology provides an entry-level RAID storage solution for dual ported host
systems with multiple paths to the storage. It offers the following advantages: an
initially lower cost system to deploy, multiple paths from host which can
maximize controller bandwidth, and it provides multiple paths for optional
upstream failover. It has several disadvantages: the RAID Controller is a single
point of failure, it requires two single ported HBAs or a dual ported HBA, and if
upstream path failover is implemented then additional software is required.
Simplex Mode Logical View - Dual Port Single Host Dual Connection
In this topology the Host I/O card switches 1, 2, and 4 are set to the “Up”
position.
Switch 1 sets the bus speed mode on the Host I/O card to 2 GB/sec.
FC HBA 1
Host/Server (Node A)
FC HBA 2
H0 H1
Port 0 (P0)
Active
Port 1 (P1)
Active
Controller 0 (C0)
Right Host I/O Card
Left Host I/O Card
SW 4
H0 H1
SW 4
imageRAID.book Page 23 Tuesday, September 23, 2003 4:08 PM