Dell 6 series User Manual page 56

If the connection between an Out port on the controller and an In port on an
enclosure fails, an alternate path exists through the second Out port on the
controller and the second In port on the enclosure. For more information, see
Figure 4-11, Figure 4-12 and Figure 4-13.
NOTE:
The PERC 6/E adapter supports redundant paths when used with
Dell PowerVault™ MD1000 and Dell PowerVault MD1120 disk storage enclosures.
Figure 4-11 displays Redundant path Storage Configuration with one
enclosure.
Figure 4-11. Redundant Path Support Configuration With One Enclosure
Figure 4-12 displays Redundant path Storage Configuration with two
enclosures.
Figure 4-12. Redundant Path Support Configuration With Two Enclosures
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Installing and Configuring Hardware
Storage
Storage
Storage
Storage
Storage
Storage