Which command shows link width and speed across the fabric?
Why C is the answer
iblinkinfo
iblinkinfo reports link details.
In detail
- iblinkinfo reports link details.
- It reports link details.
Use case
An illustrative scenario, not a real incident.
An engineer finds a link running at a lower speed with iblinkinfo.
See it in different ways
flowchart TD
A{"What do you want to know?"} -->|"Local port state"| B["ibstat"]
A -->|"Which nodes exist"| C["ibnodes"]
A -->|"Link details"| D["iblinkinfo"]
A -->|"Fabric errors"| E["ibdiagnet"]
A -->|"RDMA speed"| F["ib_write_bw and ib_write_lat"]stateDiagram-v2 [*] --> LocalPort: ibstat LocalPort --> Fabric: ibnodes and iblinkinfo Fabric --> Errors: ibdiagnet Errors --> Path: ibping Path --> Speed: ib_write_bw and ib_write_lat Speed --> [*]
flowchart LR S0["Run iblinkinfo"] --> S1["Find slow links"] --> S2["Fix them"]
Key point: iblinkinfo shows width and speed.
Why the other options are wrong
- A. ib_write_bw
- That measures bandwidth.
- B. nv config save
- That saves switch configuration.
- D. ibping
- That tests reachability.