68 IBM System Storage N series Hardware Guide
6.2.2 Multipath Fibre Channel cabling
Figure 6-8 shows four EXN4000 disk shelves in two separate loops that are connected to an
HA pair with redundant multipath cabling. No single Fibre Channel cable or shelf controller
failure causes a takeover situation.
Figure 6-8 EXN4000 dual controller with multipath
Tip: For N series controllers to communicate with an EXN4000 disk shelf, the Fibre
Channel ports on the controller or gateway must be set for initiator. Changing the behavior
of the Fibre Channel ports on the N series system can be performed by using the fcadmin
command.