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Chapter 2 - Topologies and Operating Modes
Simplex Mode
The simplex operating mode uses a single RAID controller solution that provides
a limited level of redundancy. With its dual port topology, the controller also
provides dual active ports that increases the bandwidth capabilities. Essentially,
there are four supported topologies for this operating mode:
Dual Port Single Host Connection
This topology provides an entry-level RAID storage solution for single ported HBA
host system. It offers the following advantages: an initially lower cost system to
deploy and is a simple direct attached solution. It has several disadvantages:
multiple points of failure (host server, host HBA, controller, and data cable), and it
has limited bandwidth capabilities due to its single Fibre loop (200 MB/sec).
22
Simplex Mode
"Dual Port Single Host Connection" on page 22
I
"Dual Port Single Host Dual Connection" on page 23
I
"Dual Port Multi-Host Single Connection" on page 24
I
"Dual Port Multi-Host Dual Connection" on page 25
I
Host/Server (Node A)
H1
Right Host I/O Card
SW 4
Simplex Mode Logical View - Dual Port Single Host Connection
FC HBA 1
H0
Port 0 (P0)
Port 1 (P1)
Active
Active
Controller 0 (C0)
H1
H0
Left Host I/O Card
SW 4
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