Dell PowerEdge C8000 Hardware Owner's Manual page 17

• Dual port mode
In dual port mode, the storage sled SAS expander board supports 12 x 2.5
or 3.5-inch SAS hard-drives from a dual-cable connection.
The figure below shows a dual path connection from a dual-HBA compute
sled connected to the storage sled's external mini-SAS A1 and B1
connectors. This mode delivers dual path functionality and redundant
path capability.
Figure 1-11. Dual Port Mode Configuration
Storage Sled
Port 1
Port 2
Port 1
Port 2
Dual-HBA Compute Sled
About Your System
17