Lenovo ThinkSystem SR650 V2 - Page 124

Switch cards (32 x NVMe)
The following shows the cable connections for the 32 x 2.5-inch NVMe configuration with four switch cards.
From To
Backplane 1: NVMe 0-1, 2-3, 4-5, 6-7 Switch card on PCIe slot 1: C0, C1, C2, C3
Backplane 2: NVMe 0-1, 2-3, 4-5, 6-7 Switch card on PCIe slot 2: C0, C1, C2, C3
Backplane 3: NVMe 0-1, 2-3, 4-5, 6-7 Switch card on PCIe slot 4: C0, C1, C2, C3
Backplane 5: NVMe 0-1, 2-3 Switch card on PCIe slot 5: C0, C1
Backplane 6: NVMe 0-1, 2-3 Switch card on PCIe slot 5: C2, C3
Connections between connectors:
1 ↔ 1 , 2 ↔ 2 , 3 ↔ 3 , ... n ↔ n
Figure 57. Cable routing for the 32 x 2.5-inch NVMe configuration with four switch cards
114 ThinkSystem SR650 V2Maintenance Manual