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How do I maintain and troubleshoot the Mellanox ConnectX-5 Ex dual-port QSFP28 adapter?

Mellanox MCX556A-EDAT ConnectX-5 Ex VPI adapter card, EDR IB (100Gb/s) and 100GbE, dual-port QSFP28, PCIe4.0 x16, tall bracket

MCX556A-EDAT

Q
How do I maintain and troubleshoot the Mellanox ConnectX-5 Ex dual-port QSFP28 adapter?
A
For best results, keep the card free of dust, ensure proper airflow in the server, and use updated Mellanox/NVIDIA firmware and drivers. If the card is not detected or links won’t come up at 100Gb, check PCIe slot compatibility, BIOS settings, cable or transceiver support, and whether your environment is configured for InfiniBand or Ethernet mode.