Middle and rear backplanes: 4 x 3.5-inch SAS/SATA + 4 x 3.5-inch/4 x 2.5-inch SAS/ 
SATA
This topic provides cable routing information for the 12 x 3.5-inch SAS/SATA server model with a 4 x 3.5- 
inch SAS/SATA middle drive cage and a 4 x 3.5-inch/4 x 2.5-inch SAS/SATA rear drive cage.
•  “Onboard connectors + 8i RAID/HBA adapter” on page 173
•  “32i RAID/HBA adapter” on page 175
Onboard connectors + 8i RAID/HBA adapter
•  “Front backplane: 12 x 3.5-inch SAS/SATA” on page 173
•  “Middle and rear backplanes: 4 x 3.5-inch SAS/SATA + 4 x 3.5-inch/4 x 2.5-inch SAS/SATA” on page 174
Front backplane: 12 x 3.5-inch SAS/SATA
The following shows the cable connections for the 12 x 3.5-inch SAS/SATA configuration with onboard 
connectors.
From To
Backplane 1: SAS 0, SAS 1 Onboard: SATA 0, SATA 1
Backplane 1: SAS 2 Onboard: SATA 2
Connections between connectors: 
1  ↔  1 ,  2  ↔  2 ,  3  ↔  3 , ...  n  ↔  n
Figure 131. Cable routing for the 12 x 3.5-inch SAS/SATA configuration with onboard connectors
Chapter 3. Internal cable routing 173