Question 490
During a shared-cluster operating review at a university HPC center, engineers report the following issue: A vendor proposal claims RDMA performance without defining how bursty traffic will be controlled. The affected work supports research training and scheduled compute allocations; fair resource access and repeatable cluster operations matter. Choose TWO: one corrective approach and one result demonstrating it works. (Select TWO.)
Explanation
Correct Answers
Correct corrective action. Plan Ethernet-based RDMA such as RoCE with appropriate traffic engineering and congestion behavior rather than assuming a generic best-effort Ethernet configuration is sufficient. This fits the specific reported issue: A vendor proposal claims RDMA performance without defining how bursty traffic will be controlled. The corresponding failure being reduced is: Congestion or improper priority handling can sharply degrade latency and throughput of RDMA workloads.
Correct independent evidence. A congested multi-flow test checks RDMA throughput and loss or congestion telemetry against the required service target. This verifies the corrective approach for the affected research training and scheduled compute allocations instead of treating an architecture diagram alone as success.
Incorrect Answers
Not the most direct the action-and-evidence pair for these facts. Explain remote direct memory access as reducing CPU involvement and copying for supported memory transfers, while checking protocol and adapter requirements. This choice concerns rdma direct memory transport concepts and may be valid in another design. But this case reports 'A vendor proposal claims RDMA performance without defining how bursty traffic will be controlled', which calls for reasoning about roce congestion and loss-management considerations. The targeted response is: Plan Ethernet-based RDMA such as RoCE with appropriate traffic engineering and congestion behavior rather than assuming a generic best-effort Ethernet configuration is sufficient.
Not the most direct the action-and-evidence pair for these facts. Separate out-of-band host and switch management from high-volume AI workload traffic and restrict access to authorized operators. This choice concerns management network isolation and access and may be valid in another design. But this case reports 'A vendor proposal claims RDMA performance without defining how bursty traffic will be controlled', which calls for reasoning about roce congestion and loss-management considerations. The targeted response is: Plan Ethernet-based RDMA such as RoCE with appropriate traffic engineering and congestion behavior rather than assuming a generic best-effort Ethernet configuration is sufficient.
Not the most direct the action-and-evidence pair for these facts. A representative job is scheduled, retrieves its data, communicates across nodes and reports health through the expected management plane. This choice concerns core components of an accelerated ai cluster and may be valid in another design. But this case reports 'A vendor proposal claims RDMA performance without defining how bursty traffic will be controlled', which calls for reasoning about roce congestion and loss-management considerations. The targeted response is: Plan Ethernet-based RDMA such as RoCE with appropriate traffic engineering and congestion behavior rather than assuming a generic best-effort Ethernet configuration is sufficient.