After a change window, county clinic InfiniBand nodes cannot join the intended tenant. What should operators diagnose?
Select an answer to reveal the explanation.
Short Explanation
If clinic nodes bounced off the wrong door, check the guest list. Diagnose InfiniBand PKey membership errors that broke—or leaked—tenant access after the change.
Full Explanation
When county clinic InfiniBand nodes cannot join the intended tenant after a change window, operators should diagnose InfiniBand PKey membership errors that break or incorrectly grant tenant access. Membership mismatches—wrong PKey, missing GUID, wrong limited/full type, or stale entries—commonly explain “cannot join partition” symptoms after maintenance. Focusing the diagnosis on the PKey membership table ties the clinic outage to the InfiniBand multi-tenancy control plane. InfiniBand MTU and rate settings that tune packet size for fabric throughput efficiency fail by concept: they tune packet size and link speed for throughput efficiency, but do not explain partition join/denial governed by PKeys. Treating Spectrum PFC pause frames as the InfiniBand tenancy control fails because PFC is Ethernet congestion behavior, not IB partition membership. Looking only at InfiniBand service level and QoS policies instead of InfiniBand PKey membership fails when the symptom is IB tenant join: QoS policies prioritize traffic on congested links but do not replace verifying HCA GUID membership in the correct clinic PKey. Exam caveat: post-change IB tenancy failures are usually membership/config, not Ethernet pause or MTU and rate settings. Operational check: list the clinic HCA GUIDs, compare them to the intended PKey membership and membership type, correct mismatches, retest partition join, and confirm no unintended extra PKeys were granted during the change window.