Dell PowerEdge Use Manual page 39

Network-Attached Cluster Connected to an External Fabric
External Switches incorporate the external switch network or SAN connected
to the PowerEdge Enclosure through the pass-through modules or switch
modules. These configurations allow you to extend the Fibre Channel/iSCSI
network by connecting more storage systems. The following sections provide
examples for these configurations.
Cabling PowerEdge Server Enclosures With Pass-Through Modules to an
External Fabric
Figure 2-8 shows an example of a switch-attached iSCSI cluster with
embedded Ethernet pass-through modules that are connected to external
Ethernet switches (dedicated for iSCSI). Figure 2-8 illustrates a PowerEdge
1855/1955 server enclosure configured with an iSCSI storage array. You can
use a similar configuration model for other supported server modules, server
enclosures, and storage arrays.
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Cabling Your Blade Cluster Hardware