How To
Summary
If Netflow settings are misconfigured or a peer is receiving too many flows, the disk may fill up to 100%. If this occurs, the SQL database on the peer will fail to function properly. Corrective action should be taken to restore the DNC to a functional state.
Objective
Recover from a DNC peer at 100% disk space use
Environment
IBM SevOne Network Performance Management
Steps
Review Aggregated Flow Data Retention in Adminstration>Cluster Manager>Cluster Settings>FlowFalcon. Here, you can change Flow retention. These are the default settings:
Review Aggregate Flow settings on a per peer basis - default settings again depicted below:
Please consult Cluster Manager documentation for suggestions on FlowFalcon settings.
After changing settings, log into the DNC primary peer using SSH or the virtual machine console and run these commands. On NPM 7.0.0 and later, get a command shell inside the nms-nms-nms pod:
podman --url=unix:/run/podman_sevone/podman.sock exec -it nms-nms-nms /bin/bashThese commands are taken from the crontab on a NMS peer and will make entries into the system log. These commands typically run on a schedule, but cannot run on a peer with full disk.
# Trim raw flows in /data/SevOne-flowdb/ according to Cluster Settings
SevOne-act flowdb trim --log-timestamp --log-start-stop 2>&1 | logger -t SevOne-act-flowdb-trim
# Trim aggregate flows stored in SQL DB at /data/mysql/netflow
SevOne-act trim netflow --log-timestamp --log-start-stop 2>&1 | logger -t SevOne-act-trim-netflowAfterwards, review disk space used and SQL database health.
Additional Information
Sometimes, the SQL database will require a restart once space is freed. This should be done with IBM SevOne Support assistance as it might involve polled data loss or corrupted database tables.
Related Information
Document Location
Worldwide
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Document Information
Modified date:
20 January 2026
UID
ibm17248587