Power Supply Failure / Redundancy Lost

A node power supply fails or loses redundancy, risking a hard node-down event mid-training; sensor telemetry gives early warning before the node drops.

Power Supply Failure / Redundancy Lost is a Infrastructure failure seen during ML training runs. A node power supply fails or loses redundancy, risking a hard node-down event mid-training; sensor telemetry gives early warning before the node drops. Common tags: Power Supply, Psu, Ipmi, Infrastructure.

PSU hardware failure. Power feed / PDU issue. Thermal or load stress on the supply. Taken together, these mechanisms explain why the failure is reproducible, why it tends to surface on specific workloads or scales, and why generic mitigation attempts often fall short without addressing the underlying cause.

• Node at risk of sudden power loss
• PSU redundancy lost (running on one supply)
• Power-related sensor alarms

• GPU servers with redundant PSUs
• Dense power-hungry 8-GPU nodes
• Clusters with BMC/IPMI telemetry

Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.

• ✓Reproduce the failure from a clean checkpoint/seed: the symptom must appear without warm-up state from a previous run.
• ✓Verified signal present: Power Supply Failure detected (BMC/IPMI sensor)
• ✓Verified signal present: PSU redundancy lost
• ✓Verified signal present: Voltage/current sensor out of range
• ✓A targeted fix from the "How to fix it" section eliminates or substantially reduces the symptom within one validation pass.

Select the traceback or open the failed terminal, then run Denpex locally to see the initiating rank, collateral failures, exact fix, and verification command without uploading the log.

• PSU hardware failure
• Power feed / PDU issue
• Thermal or load stress on the supply