Figure 4 through Figure 6 show redundant, high-availability cabling configurations on one and two hosts.
If any one path fails, at least one HBA is still connected to one RAID controller.
Figure 4. Cabling a Single Host Using Redundant Data Paths (MD3000)
RAID controller module 0
dual-HBA host server
RAID controller module 1
MD3000 RAID Enclosure
MD1000 Expansion Enclosure
MD1000 Expansion Enclosure