Aegis-GPU5.3 Replacing parts
Hot-swapping PSUs and fans safely and getting an RMA for other parts.
Key points
Hot-swapping means replacing a part while the system runs. The DGX H100 runs at full capacity on four PSUs. All PSUs must come from the same manufacturer. An empty PSU bay disturbs airflow, so the swap must be fast.
What NVIDIA says (3)
“If the system is on, make sure at least 4 other power supplies are working by confirming the IN and OUT LEDs are lit green:”
“All PSUs in the system must be from the same manufacturer.”
“Once the power supply is out of the chassis, replace it with the new power supply in less than 30 seconds to avoid airflow disruptions in the system”
Verification after a repair means proving the new part works. The fan swap must take less than 30 seconds to avoid overheating. Then confirm with the BMC, the LED and nvsm.
What NVIDIA says (2)
“Replace the old fan with the new one within 30 seconds to avoid overheating of the system components.”
“Verifying that the amber LED on the fan module is extinguished”
An RMA (return merchandise authorization) is the number that tracks a return. NVIDIA says to get one from Enterprise Support and to use only NVIDIA-supplied replacements.
What NVIDIA says (2)
“Contact NVIDIA Enterprise Support to obtain an RMA number for any system or component that needs to be returned for repair or replacement.”
“When replacing a component, use only the replacement supplied to you by NVIDIA.”
Key terms
- Customer-replaceable unit: A component the customer may replace on site with an NVIDIA-supplied part.
- Return merchandise authorization: The number NVIDIA support gives you to return a faulty part for repair or replacement.
Sample question
You are hot-swapping a failed PSU on a running DGX H100. Which rules does NVIDIA give?
Show the answer
Answer: Make sure at least 4 other PSUs are working, use a replacement from the same manufacturer, and swap it in less than 30 seconds.
Hot-swapping means replacing a part while the system runs. The DGX H100 runs at full capacity on four PSUs. All PSUs must come from the same manufacturer. An empty PSU bay disturbs airflow, so the swap must be fast.
What NVIDIA says (3)
“If the system is on, make sure at least 4 other power supplies are working by confirming the IN and OUT LEDs are lit green:”
“All PSUs in the system must be from the same manufacturer.”
“Once the power supply is out of the chassis, replace it with the new power supply in less than 30 seconds to avoid airflow disruptions in the system”
Practice 5.3 (3 questions) Full Troubleshoot and Optimize guide
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