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Backplane

Use the section to understand the cable routing for backplanes.

Before you route cables for backplanes, observe the adapter priority and the PCIe slot selection priority when installing the NVMe switch adapter or a RAID adapter.

  • Adapter priority: NVMe switch adapter, 24i RAID adapter, 8i HBA/RAID adapter, 16i HBA/RAID adapter

  • PCIe slot selection priority when installing the NVMe switch adapter:

    Number of installed processorsPCIe slot selection priority
    One processor1
    Two processors1, 5, 6
    • For server models with sixteen/twenty/twenty-four NVMe drives (with two processors installed):
      Server modelsPCIe slot selection
      Sixteen NVMe drives1, 4, 6, 7
      Twenty NVMe drives1, 4, 5, 6, 7
      Twenty-four NVMe drives1, 2, 4, 6, 7
  • PCIe slot selection priority when installing a 24i RAID adapter:

    Number of installed processorsPCIe slot selection priority
    One processor1, 2, 3
    Two processors1, 2, 3, 5, 6
  • PCIe slot selection priority when installing a 8i or 16i HBA/RAID adapter:

    Number of installed processorsPCIe slot selection priority
    One processor7, 4, 2, 3, 1
    Two processors7, 4, 2, 3, 1, 5, 6
Note:
  • The PCIe slot 7 refers to the RAID adapter slot on the system board.

  • If the rear hot-swap drive assembly is installed, PCIe slots 1, 2, and 3 will become unavailable because the space is occupied by the rear hot-swap drive assembly.

  • The adapter priority of the 530-16i or 930-16i RAID adapter adapter can be higher than the 930-8i RAID adapter when both 16i RAID adapter and 8i RAID adapter are chosen.

  • Oversubscription may exist in some configurations installed with NVMe 810-4P/1610-8P/1611-8P switch adapters. For details, see Controllers for internal storage.