32i RAID/HBA adapter + retimer card
•  “Front backplanes: 16 x 2.5-inch SAS/SATA + 8 x 2.5-inch Anybay” on page 155
•  “Rear backplane: 4 x 2.5-inch SAS/SATA” on page 156
Front backplanes: 16 x 2.5-inch SAS/SATA + 8 x 2.5-inch Anybay
The following shows the cable connections for 16 x 2.5-inch SAS/SATA + 8 x 2.5-inch Anybay configuration 
with one 32i RAID/HBA adapter and one retimer card.
From To
Backplane 1: SAS 32i RAID adapter on PCIe slot 2: C0
Backplane 2: SAS 32i RAID adapter on PCIe slot 2: C1
Backplane 3: SAS 32i RAID adapter on PCIe slot 2: C2
Backplane 3: NVMe 0-1, 2-3
Onboard: PCIe 1, PCIe 2
Backplane 3: NVMe 4-5, 6-7
Retimer card on PCIe slot 1: C0, C1
Connections between connectors: 
1  ↔  1 ,  2  ↔  2 ,  3  ↔  3 , ...  n  ↔  n
Figure 110. SAS/SATA cable routing
Figure 111. NVMe cable routing
Chapter 3. Internal cable routing 155