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Backplane

Use the section to understand the cable routing for backplanes.

This topic contains the following information:

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.