Dell PowerEdge Use Manual page 36

For more information on configuring the tape and storage components, see
the storage and tape backup documentation.
Cabling Two PowerEdge Server Enclosures to One or Two Dell|EMC Storage
Systems
The PowerEdge blade cluster supports up to two PowerEdge server enclosures
and up to two Dell|EMC storage systems. In this configuration, two inter-
switch links (ISLs) are required to connect each pair of Fibre Channel switch
modules between the PowerEdge server enclosures.
For high availability, each PowerEdge server enclosure requires direct paths to
the attached storage systems. This configuration ensures that all running
applications are available if one of the PowerEdge server enclosures needs to
be shut down for maintenance.
Figure 2-6 shows two PowerEdge 1855/1955 server enclosures cabled to one
supported Dell|EMC storage system in an iSCSI configuration.
Figure 2-7 shows two PowerEdge M1000e server enclosures cabled to two
supported Dell|EMC storage systems in Fibre Channel configuration.
In both figures, the server module's dual-port Fibre Channel daughter card
and Fibre Channel modules are connected internally in the system chassis.
You can use a similar configuration model for other supported server modules,
server enclosures, and storage arrays.
36
Cabling Your Blade Cluster Hardware