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NEW QUESTION # 15
A system administrator needs to validate a GPU-based server and ensure that no errors occur under load.
What command should be used?
Answer: A
Explanation:
While there are many ways to stress a system, the verified method to check for errors under load in an NVIDIA DGX environment is to monitor the system usingNVSM (NVIDIA System Management). Running nvsm show health is the standard command to verify that all hardware components-including GPUs, memory, and storage-are operating within their defined specifications. To truly ensure no errors occur
"under load," an administrator will typically run a workload (like HPL or NCCL tests) and concurrently run nvsm show health or nvsm monitor to check for real-time telemetry such as thermal throttling, PCIe errors, or power fluctuations. nvsm show health aggregates data from the BMC and the OS to provide a "Red/Green" status of the entire system. There is no standard command named nvsm stress-test (Option D) or stress-test -- usage (Option B) in the official NVIDIA DGX software stack.
NEW QUESTION # 16
You're deploying a multi-GPU training job on a cluster using Slurm. You need to ensure that the GPUs allocated to the job are healthy and functioning correctly before the training starts. What's the MOST effective approach to pre-validate the GPU hardware?
Answer: E
Explanation:
Using the DCGM diagnostic suite is the most thorough way to pre-validate GPU hardware. DCGM provides comprehensive tests to check GPU health, including memory, compute, and interconnects. A simple CUDA program or checking nvidia-smr provides basic validation, but not as comprehensive as DCGM. Monitoring temperature is reactive, not proactive. Assuming GPUs are healthy without validation is risky.
NEW QUESTION # 17
Refer to the output:
~ $ sudo nvsm show healthinfo
-Timestamp: Sat Dec 16 16:26:32 2017 -0800
Version: 17.12-5
Checks-BIOS Revision [5.11].........................
DGX Serial Number [YSY72800016)..................
Verify installed DIMM memory sticks........................Healthy
...[output truncated)
Verify Ethernet controllers...........................Healthy
Verify installed GPU's..............................Unhealthy
Checking output of 'lspci' for expected GPU's
Missing GPU at PCI address '07:00.0'
Verify installed InfiniBand controllers....................Healthy
Verify PCIe switches..................................Healthy
...[output truncated)
What insights can a system administrator gain regarding the DGX system's health?
Answer: B
Explanation:
The output provided is a result of theNVIDIA System Management (NVSM)tool, specifically the nvsm show healthinfo command. NVSM is an essential diagnostic framework for NVIDIA DGX systems that monitors hardware health, identifies faults, and helps ensure the system remains within its validated operational state.
In this specific diagnostic trace, the system reports that the "Verify installed GPU's" check has returned a status ofUnhealthy. To provide a root cause, NVSM cross-references the live hardware enumeration from the lspci command against the system's known "Golden Configuration" (the hardware manifest defined in the firmware). The explicit error message,"Missing GPU at PCI address '07:00.0'", indicates that the system expects a GPU module to be present at that specific PCIe bus address, but the hardware is not responding or visible to the bus.
This insight allows a system administrator to conclude that aGPU is missingfrom the logical perspective of the system. This is a critical hardware fault rather than a software or driver issue. In a DGX H100 or A100 system, this could be caused by a physical module failure, a power delivery issue to that specific segment of the GPU baseboard, or a failure in the PCIe switch fabric. Because the DGX relies on a full set of 8 GPUs for high-speed collective communications (NCCL), a single missing GPU will prevent the node from participating in large-scale training jobs, requiring physical inspection or a GPU tray replacement (RMA).
NEW QUESTION # 18
A single-node stress test fails during the PCle bandwidth validation phase. Which troubleshooting step is recommended first?
Answer: D
Explanation:
A PCIe bandwidth validation failure commonly points to a physical seating, link-training, or connection issue between the GPU and the server PCIe slot. Reseating the GPU and rerunning the test is the recommended first step because it directly addresses the most likely hardware/connection cause before changing BIOS settings or reinstalling software.
NEW QUESTION # 19
You are managing an A1 infrastructure based on NVIDIA Spectrum-X switches. A new application requires strict Quality of Service (QOS) guarantees for its traffic. Specifically, you need to ensure that this application's traffic receives preferential treatment and minimal latency.
What combination of Spectrum-X features and configurations would be MOST effective in achieving this?
Answer: E
Explanation:
DSCP marking, traffic class mapping, and WFQ/Strict Priority Queueing are fundamental QOS mechanisms. DSCP marking allows you to classify traffic based on application requirements. Traffic classes within the switch provide different levels of service. WFQ and Strict Priority Queueing ensure that high-priority traffic receives preferential treatment on egress ports. The other options are less relevant to QOS guarantees for a specific application.
NEW QUESTION # 20
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