KB 409912 - Managing OpenSM within NVIDIA UFM and getting OpenSM Logs from UFM

KB 409912 - Managing OpenSM within NVIDIA UFM and getting OpenSM Logs from UFM

Overview

In NVIDIA UFM (Unified Fabric Manager), OpenSM — the InfiniBand Subnet Manager — is managed internally by UFM rather than as a standalone systemd service. This allows UFM to control the IB fabric, collect telemetry, and maintain HA configurations without requiring manual OpenSM service management.

How UFM Handles OpenSM

  • OpenSM is launched directly from the UFM installation path:

    /opt/ufm/opensm/sbin/opensm

  • The configuration file used by UFM is located at:

    /opt/ufm/files/conf/opensm/opensm.conf

  • UFM monitors OpenSM, ensuring it runs on the designated primary node and manages failover in HA configurations.

  • Telemetry and diagnostic processes (like ibdiagnet) are also invoked by UFM to monitor port health, link utilization, and performance counters.

Note: On UFM-managed systems, OpenSM does not have a systemd service. Attempting systemctl status opensm will return "Unit opensm.service could not be found."

OpenSM Logs in UFM

All OpenSM-related logs and dumps are stored under the UFM log directory:

/opt/ufm/files/log/

Relevant files include:

  • opensm.log — main OpenSM runtime log

  • opensm-statistics.dump — fabric statistics dump

  • opensm-smdb.dump — Subnet Manager database snapshot

  • opensm-activity.dump — recorded activity

  • opensm-virtualization.dump — virtualization-specific info

Other diagnostic logs and telemetry outputs may also contain OpenSM-related data.

Copying OpenSM Logs to Your Local Computer

1. Create a local folder in the home directory

mkdir -p ~/ufm_opensm_logs

2. Copy all OpenSM logs and directories

cp -r /opt/ufm/files/log/opensm* ~/ufm_opensm_logs/

3. Verify the copied files

ls -lh ~/ufm_opensm_logs/

4. Transfer logs to your local machine using SCP

From your local computer, run:

scp -r root@<UFM_NODE_IP>:~/ufm_opensm_logs/ /local/path/to/save/

Replace:

  • <UFM_NODE_IP> with the UFM node’s IP (e.g., T10PHGXUFMST02)

  • /local/path/to/save/ with the local directory where you want to store the logs

Optional: For faster transfer, compress the folder first:

tar -czvf ~/ufm_opensm_logs.tar.gz -C ~ ufm_opensm_logs
scp root@<UFM_NODE_IP>:~/ufm_opensm_logs.tar.gz /local/path/

Summary

  • OpenSM in UFM is managed by UFM; no standalone systemd service exists.

  • Logs and dumps are centralized under /opt/ufm/files/log/.

  • Copying logs to your home directory and using scp allows easy transfer to your workstation for analysis or archival.

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