nStor NexStor 4200F Series, User Manual

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Chapter 2 - Topologies and Operating Modes
Dual Port Single Host Dual Connection
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Dual Port Single Host Dual Connection
Simplex Mode Logical View - Dual Port Single Host Dual Connection
This topology provides an entry-level RAID storage solution for single HBA port
host systems. It offers advantages of low initial costs and is a simple direct
attached solution. It has several disadvantages over the other more robust
topologies with multiple points of failure (host server, host HBA, controller, and
cable). It also has limited bandwidth performance due to a singe Fibre loop (200
MB/sec).
In this configuration the Host I/O card switch 4 is set to the “Up” position.
Switch 4 ties the H0 and H1 ports to the same Fibre loop. This allows both host
port on each Host I/O card with an active connection to the specific controller
host port.
FC HBA 1
Host/Server (Node A)
FC HBA 2
H0
H1
C0P0
Active
C0P1
Active
Controller 0
Right Host I/O Card
Left Host I/O Card
SW 4
H0 H1
SW 4
SW 5 SW 5
4200F.book Page 24 Thursday, January 23, 2003 2:47 PM