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StorageGrid nodes are showing major alert FOPN (Open File Descriptors)

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storagegrid-webscale
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sgrid
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Applies to

  • StorageGRID 11.6+
  • External Load Balancer
  • LDR

Issue

  • Other then FOPN alarms triggered via the UI. To determine if FOPN are increasing on storage nodes.
    • Collect data on network sockets and open files on the storage nodes exhibiting the alert.
      • On the storage node(s), run the following, collect the /var/local/tmp/fopn_collection.tar.gz file and upload to NetApp.

    mkdir /var/local/tmp/fopn_collection; sleep 1; ss -t > /var/local/tmp/fopn_collection/ss.output; netstat -nat > /var/local/tmp/fopn_collection/netstat.output; sleep 1; lsof -p $(pidof ldr) > /var/local/tmp/fopn_collection/lsof.output; tar czvf /var/local/tmp/fopn_collection.tar.gz /var/local/tmp/fopn_collection/*

    • Storage Nodes incrementing FOPN (Open File Descriptors) alarms across multiple nodes.
      • Depending on the type and priority of client workload. The below values may be too high before triggering an alarm to notify administrators of an issue. 
        • Workloads most affected by increasing FOPNs are applications sensitive to delete workflows.
      • It is recommended to add a custom alarm if client application workload was determined to be affected by high FOPN values. 
      • Below are the default triggering values and their severityScreenshot 2026-01-05 141921.png

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