Figure 197. Cable routing for 8 x 2.5-inch front SAS/SATA drive bays with an 8i CFF RAID/HBA adapter (Gen 3) 
Table 38.  Mapping between one 8 x 2.5-inch front SAS/SATA backplane and an 8i CFF RAID/HBA adapter
From To
1  SAS 0 on the front backplane 1  C0 on the CFF RAID/HBA adapter
2  SAS 1 on the front backplane 2  C1 on the CFF RAID/HBA adapter
10 x 2.5 front drives
Use this section to understand the AnyBay backplane cable routing for server model with ten 2.5-inch front 
drives.
10 x 2.5 AnyBay backplane
Use this section to understand the AnyBay backplane cable routing for server model with ten 2.5-inch front 
drives.
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ThinkSystem SR635 V3 User Guide