Dell PowerVault MD3000 - Manual (Page 17)

Hardware Installation
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Figure 2-11 through Figure 2-12 show redundant, two-node cluster
configurations using a single RAID enclosure that is subsequently expanded
to two more storage enclosures.
Figure 2-11. Cabling a Two-Node Cluster (Single HBA, Redundant Data Paths From
Each Node)
single-HBA host server
single-HBA host server
RAID controller module 0
RAID controller module 1
MD3000 RAID Enclosure
MD1000 Expansion Enclosure
MD1000 Expansion Enclosure