KB 471688 - How to Collect InfiniBand Transceiver Temperature (Non-Root Method)
1. Purpose
This document explains how to collect InfiniBand (IB) transceiver (QSFP module) temperature from servers using the Linux sysfs hwmon interface without requiring root privileges.
This method applies to systems using Mellanox / NVIDIA mlx5-based adapters (e.g., ConnectX series).
2. Scope
Works when:
3. Prerequisites
Verify IB devices:
Expected output:
4. Collect Transceiver Temperature (Single Device)
Example for mlx5_0:
Sample Output
Interpretation
-
asic → HCA chip temperature
-
Module0 / Module1 → Transceiver temperature
-
Values are in millidegree Celsius
Convert:
5. Collect From All IB Interfaces with Timestamp
To save to file:
7. Temperature Threshold Reference
| Component | Normal | Warning | Critical |
|---|
| ASIC | 45–75°C | >85°C | >95°C |
| Transceiver | 30–70°C | >75°C | >80–85°C |
If transceiver temperature exceeds 75°C:
-
Check airflow
-
Check fan speed
-
Verify BMC sensor status
-
Escalate if persistent
8. Validation
Always cross-check:
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