Lenovo ThinkSystem SR635 V3 User Manual page 264

Cable routing with an SFF RAID/HBA adapter
Note: Gen 3 and Gen 4 SFF RAID/HBA adapters are slightly different in their connectors, but the connection
method is similar. The following illustration takes Gen 4 SFF RAID/HBA adapters as an example.
Figure 191. Cable routing of 4 x 2.5-inch front NVMe drive bays (using 4 x2.5-inch AnyBay backplane (Gen 5)) and an SFF
8i RAID/HBA adapter (Gen 3/Gen 4)
Table 32. Mapping between a front backplane and an SFF 8i RAID/HBA adapter (Gen 3/Gen 4)
From
NVMe 2-3 and NVMe 0-1 on the front backplane
1
SAS on the front backplane
2
4 x 2.5'' AnyBay backplane
Use this section to understand the cable routing for 4 x 2.5'' AnyBay backplane.
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To
PCIe connector 3 and 4 on the system board assembly
1
C0 on the SFF RAID/HBA adapter
2